All calculators
Browse all 210 free online calculators by category, or search for the one you need. Every calculator runs in your browser and shows its steps.
Showing 210 of 210 calculators
Date & Time · Age & Birthdays
Age Calculator
Exact age in years, months and days from a date of birth
Date & Time · Counters & Countdowns
Day Counter
Count the days between two dates, with weeks and business days
Date & Time · Date Math
Date Difference Calculator
The difference between two dates in years, months, weeks and days
Date & Time · Date Math
Weeks Between Dates
Weeks and leftover days between two dates
Date & Time · Date Math
Date Calculator
Add or subtract days, weeks, months or years from a date
Date & Time · Work Hours & Time
Time Card Calculator
Add up the hours on a weekly time card, with breaks and optional pay
Date & Time · Work Hours & Time
Time Clock Calculator
Hours worked between clock in and clock out
Date & Time · Work Hours & Time
Work Hours Calculator
Working days and work hours between two dates
Date & Time · Work Hours & Time
Overtime Calculator
Overtime hours and overtime pay from hours worked and hourly rate
Education & Grades · Grading
Grade Calculator
Weighted class grade and letter grade from scores and weights
Education & Grades · Grading
Weighted Grade Calculator
Course grade from category scores and weights, or the score needed to reach a target
Education & Grades · Grading
Final Grade Calculator
The score you need on the final exam to reach your target grade
Education & Grades · Grading
Test Grade Calculator
Test score and letter grade from questions missed, with a grade chart
Education & Grades · GPA
GPA Calculator
College, high school (weighted) and cumulative GPA from letter grades and credits
Math & Statistics · Arithmetic & Percentages
Percentage Calculator
Percent of a number, percent change and percent increase or decrease
Math & Statistics · Arithmetic & Percentages
Ratio Calculator
Simplify a ratio or solve a proportion for the missing number
Math & Statistics · Geometry
Slope Calculator
Slope, line equation, angle and distance from two points
Math & Statistics · Geometry
Volume Calculator
Volume of a cube, box, cylinder, cone, sphere or pyramid
Math & Statistics · Arithmetic & Percentages
LCM Calculator
Least common multiple of 2 to 10 numbers, with prime factors
Math & Statistics · Arithmetic & Percentages
GCF Calculator
Greatest common factor of 2 to 10 numbers, with prime factors
Math & Statistics · Statistics & Probability
Average Calculator
Mean, median, mode, sum and range of a list of numbers
Math & Statistics · Statistics & Probability
Standard Deviation Calculator
Standard deviation and variance of a sample or a population
Math & Statistics · Algebra
Quadratic Formula Calculator
Solve ax² + bx + c = 0: real or complex roots, discriminant and vertex
Math & Statistics · Geometry
Midpoint Calculator
Midpoint of two points, or the missing endpoint from a midpoint
Math & Statistics · Statistics & Probability
Weighted Average Calculator
Average of values that count for different amounts, with each weight shown
Math & Statistics · Statistics & Probability
Permutation Calculator
Ordered arrangements nPr of r items from n, with or without repetition
Math & Statistics · Statistics & Probability
Combination Calculator
Unordered selections nCr of r items from n, with or without repetition
Math & Statistics · Arithmetic & Percentages
Square Root Calculator
Square or cube root with radical form and nearest perfect squares
Math & Statistics · Arithmetic & Percentages
Factor Calculator
All factors, factor pairs and prime factorization of a whole number
Math & Statistics · Geometry
Pythagorean Theorem Calculator
Missing side, area, perimeter and angles of a right triangle from any two sides
Math & Statistics · Statistics & Probability
Z-Score Calculator
Z-score, percentile and tail probabilities from a value, mean and standard deviation
Math & Statistics · Statistics & Probability
Probability Calculator
Single event, A and B, A or B, conditional and repeated-trial probability with odds
Math & Statistics · General-Purpose
Basic Calculator
Add, subtract, multiply and divide, with brackets, percent and powers
Math & Statistics · General-Purpose
Simple Calculator
Big keys for adding, subtracting, multiplying and dividing
Finance & Money · Margins & ROI
Profit Margin Calculator
Profit, margin and markup from revenue and cost, or the price for a target margin
Finance & Money · Margins & ROI
ROI Calculator
Return on investment, simple and annualized
Finance & Money · Loans & Mortgages
Loan Payment Calculator
Monthly payment, total interest and amortization table for a fixed-rate loan
Finance & Money · Investing & Savings
Roth IRA Calculator
Tax-free growth projection and your 2026 Roth IRA contribution limit
Finance & Money · Loans & Mortgages
Mortgage Calculator
Monthly payment with tax, insurance, HOA and PMI
Finance & Money · Loans & Mortgages
Amortization Calculator
Full loan schedule by month or year, with extra payments
Finance & Money · Investing & Savings
Compound Interest Calculator
Grow a balance with compounding and regular deposits
Finance & Money · Investing & Savings
Savings Calculator
Project savings and find the time to reach a goal
Finance & Money · Investing & Savings
CD Calculator
APY and maturity value of a certificate of deposit
Finance & Money · Everyday Spending
Sales Tax Calculator
Add sales tax to a price or take it out of a total
Finance & Money · Everyday Spending
Discount Calculator
Sale price from a percent off, percent off from two prices, or two discounts in a row
Finance & Money · Margins & ROI
Margin Calculator
Revenue, cost, profit, margin and markup from any two known values
Conversions · Cooking & Kitchen
Grams to Cups Calculator
Grams, cups, tablespoons and teaspoons by ingredient
Conversions · Temperature
Temperature Converter
Celsius, Fahrenheit and Kelvin
Conversions · Length
Length Converter
Millimeters, centimeters, meters, inches and feet
Home & DIY · Rooms & Surfaces
Square Footage Calculator
Area of a room or space in square feet, yards and meters
Home & DIY · Rooms & Surfaces
Paint Calculator
Gallons or liters of paint for a room, with doors, windows and coats
Home & DIY · Building Materials
Concrete Calculator
Cubic yards and cubic meters of concrete for a slab, with a waste allowance
Home & DIY · Outdoor & Landscape
Gravel Calculator
Cubic yards and tons of gravel for a driveway, path or bed, with a waste allowance
Home & DIY · Outdoor & Landscape
Fence Calculator
Posts, sections, rails and pickets for a fence from its length, spacing and gates
Home & DIY · Rooms & Surfaces
Tile Calculator
How many tiles and boxes a floor or wall needs, with grout gaps and a waste allowance
Games & Fun · Novelty & Pets
Dog Age Calculator
Dog years in human years, with the multiply-by-7 rule for comparison
Games & Fun · Random Generators
Random Number Generator
Fair random whole numbers from any range, with or without repeats
Games & Fun · Random Generators
Dice Roller
Roll d4, d6, d8, d10, d12 or d20 dice, one or many, with every roll and the total
Math & Statistics · Arithmetic & Percentages
Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers, simplified
Math & Statistics · Arithmetic & Percentages
Exponent Calculator
Raise any base to any power, with scientific notation and negative exponents
Math & Statistics · Arithmetic & Percentages
Log Calculator
Logarithm of any base, plus ln, log10 and log2 with an antilog check
Games & Fun · Novelty & Pets
Cat Age Calculator
Cat years in human years, with years and months
Games & Fun · Random Generators
Coin Flip
Flip 1 to 100 coins with heads and tails counts and percentages
Education & Grades · Test Scores
SAT Score Calculator
Total SAT score from the two section scores, and the gap to a target
Education & Grades · Test Scores
ACT Score Calculator
ACT Composite from English, Math and Reading scores, and the gap to a target
Conversions · Cooking & Kitchen
Cooking Measurement Converter
Convert teaspoons, cups, fluid ounces, ml, grams and ounces with ingredient densities
Conversions · Cooking & Kitchen
Ounces to Cups Calculator
Convert fluid ounces and ounces by weight to US cups
Health & Fitness · Weight & Nutrition
Maintenance Calorie Calculator
Maintenance calories by Mifflin-St Jeor, Harris-Benedict or Katch-McArdle, with a range
Health & Fitness · Medical & Safety
BAC Calculator
Rough Widmark blood alcohol estimate as a range, not a driving guide
Finance & Money · Paycheck & Benefits
Take-Home Pay Calculator
Estimated pay after 2026 federal income tax, Social Security and Medicare
Finance & Money · Paycheck & Benefits
Paycheck Calculator
One paycheck line by line: 401(k), health, 2026 tax, FICA, state tax and net pay
Finance & Money · Paycheck & Benefits
VA Disability Calculator
Combined VA disability rating with bilateral factor, shown step by step
Finance & Money · Paycheck & Benefits
Salary Calculator
Hourly, daily, weekly, monthly and yearly pay converted both ways
Auto & Travel · Fuel & Trips
Fuel Cost Calculator
Trip fuel cost from distance, fuel economy and price, in US or metric units
Auto & Travel · Fuel & Trips
MPG Calculator
Miles per gallon from distance and fuel used, with L/100 km and km per liter
Auto & Travel · Vehicle Ownership
Tire Size Calculator
Compare two tire sizes: diameter, sidewall, circumference and speedometer difference
Auto & Travel · Vehicle Ownership
Vehicle Cost Calculator
Total cost of owning a car: depreciation, fuel, insurance and maintenance
Health & Fitness · Weight & Nutrition
Calorie Deficit Calculator
Daily calories to lose weight by a goal date, from maintenance calories and your target
Health & Fitness · Weight & Nutrition
Calorie Calculator
BMR, maintenance calories and weight-change targets by Mifflin-St Jeor
Health & Fitness · Weight & Nutrition
Macro Calculator
Daily protein, fat and carbohydrate grams from a calorie target
Health & Fitness · Weight & Nutrition
Protein Calculator
Daily protein range in grams from body weight and activity
Health & Fitness · Weight & Nutrition
BMI Calculator
Body mass index and standard adult category from height and weight
Health & Fitness · Weight & Nutrition
Ideal Weight Calculator
Devine, Robinson, Miller and Hamwi ideal weight formulas from height
Health & Fitness · Pregnancy & Cycles
Ovulation Calculator
Estimated ovulation day and fertile window from cycle length
Health & Fitness · Pregnancy & Cycles
Period Calculator
Estimated dates of upcoming menstrual periods
Health & Fitness · Fitness & Sleep
Pace Calculator
Running pace, finish time or distance in miles or kilometers
Health & Fitness · Fitness & Sleep
One Rep Max Calculator
Estimated 1RM from weight and reps with seven formulas
Health & Fitness · Fitness & Sleep
Heart Rate Zone Calculator
Estimated maximum heart rate and five training zones
Health & Fitness · Fitness & Sleep
Sleep Calculator
Bedtimes and wake-up times planned around 90-minute sleep cycles
Health & Fitness · Weight & Nutrition
Water Intake Calculator
General daily fluid estimate from weight, exercise and weather
Health & Fitness · Medical & Safety
Body Surface Area Calculator
Body surface area by the Mosteller formula, compared with Du Bois
Finance & Money · Margins & ROI
Markup Calculator
Selling price, cost or markup percent from any two values, with the matching margin
Home & DIY · Building Materials
Roofing Calculator
Roof area, squares and shingle bundles from the footprint, pitch, overhang and waste
Home & DIY · Rooms & Surfaces
Square Yard Calculator
Square yards from room size, or convert between square yards, feet, inches and meters
Math & Statistics · Geometry
Circumference Calculator
Circumference, diameter, radius and area of a circle from any one of them
Auto & Travel · Fuel & Trips
Mileage Reimbursement Calculator
Reimbursement from miles driven at the 2026 IRS business, medical or charity rate
Finance & Money · Loans & Mortgages
Car Payment Calculator
Monthly car payment, total interest and total cost with trade-in, tax and fees
Auto & Travel · Vehicle Ownership
Car Lease Calculator
Monthly lease payment from cap cost, residual, money factor and tax
Auto & Travel · Fuel & Trips
Gas Calculator
Gas needed and trip cost from distance, fuel economy and price, split by person
Auto & Travel · Fuel & Trips
Mileage Calculator
Miles driven from odometer readings, with miles per day, MPG and fuel cost per mile
Auto & Travel · Fuel & Trips
EV Charging Cost Calculator
Cost per charge and per mile for an electric car, with optional gas comparison
Date & Time · Date Math
Days Between Dates
How many days between two dates, with an include-end-date option and business days
Math & Statistics · Statistics & Probability
Statistics Calculator
Mean, median, mode, quartiles, standard deviation and outliers of a list of numbers
Math & Statistics · Physics & Chemistry
Physics Calculator
Speed, force, momentum, energy, work and power: solve for any one unknown in SI units
Math & Statistics · Arithmetic & Percentages
Binary Converter
Convert whole numbers between binary, octal, decimal, hexadecimal and any base to 36
Conversions · Cooking & Kitchen
Cups to Tablespoons Calculator
Convert cups, tablespoons and teaspoons in US or metric kitchen measures
Conversions · Weight & Mass
Pounds to Kilograms Calculator
Convert pounds to kilograms, ounces, grams and stone
Conversions · Length
Miles to Kilometers Calculator
Convert miles and kilometers, with meters, feet, yards and nautical miles
Conversions · Length
Millimeters to Inches Calculator
Convert millimeters to inches as decimals and the nearest fraction
Conversions · Cooking & Kitchen
ML to Cups Calculator
Convert milliliters, liters and fluid ounces to US, metric or legal cups
Games & Fun · Novelty & Pets
Love Calculator
A fun love score from two names, the same in either order, with the steps shown
Math & Statistics · Geometry
Trigonometry Calculator
Sin, cos, tan, inverse functions and a right-triangle solver
Math & Statistics · Geometry
Geometry Calculator
Area and perimeter of common 2D shapes
Math & Statistics · Geometry
Distance Calculator
Distance between two points in 2D, 3D or by latitude and longitude
Conversions · Currency & Units
Speed Converter
Convert mph, km/h, m/s, knots and ft/s
Conversions · Volume & Capacity
Volume Converter
Convert liters, US and imperial gallons, cups, fluid ounces and cubic units
Conversions · Weight & Mass
Weight Converter
Convert mg, g, kg, tonnes, oz, lb, stone and US or UK tons
Conversions · Currency & Units
Metric Conversion
Convert metric prefixes from nano to giga for meters, grams and liters
Conversions · Volume & Capacity
Gallons to Liters
Convert US and imperial gallons to liters, mL, quarts, cups and fluid ounces side by side.
Conversions · Length
Inches to CM Calculator
Convert decimal or fractional inches to cm, mm, meters and feet
Conversions · Length
KM to Miles Calculator
Convert kilometers to miles, with race distances and km/h to mph
Finance & Money · Loans & Mortgages
Mortgage Payoff Calculator
See how extra payments shorten your mortgage and save interest
Finance & Money · Loans & Mortgages
VA Loan Calculator
Estimate a VA loan payment with the funding fee and no PMI
Finance & Money · Loans & Mortgages
Down Payment Calculator
Down payment amount, loan, LTV and PMI, or months to save
Finance & Money · Loans & Mortgages
Closing Cost Calculator
Estimate closing costs and cash to close
Finance & Money · Loans & Mortgages
Home Affordability Calculator
Maximum home price from income and debts using 28/36
Home & DIY · Building Materials
Brick Calculator
Bricks and mortar for a wall from its size, openings, brick size and joint, with waste
Home & DIY · Outdoor & Landscape
Deck Calculator
Deck boards, joists and fasteners from deck size, board width, gap and joist spacing
Home & DIY · Outdoor & Landscape
Sod Calculator
Rolls, slabs and pallets of sod for a lawn, less beds and paths
Home & DIY · Outdoor & Landscape
Mulch Calculator
Cubic yards and bags of mulch from bed size and depth
Auto & Travel · Vehicle Ownership
Towing Capacity Calculator
Estimate the heaviest trailer from your own GVWR, GCWR, payload and tongue weight ratings
Conversions · Temperature
Celsius to Fahrenheit Converter
Convert degrees Celsius to Fahrenheit with the formula and everyday reference points
Math & Statistics · Arithmetic & Percentages
Roman Numerals Converter
Convert numbers 1 to 3999 to Roman numerals and back, with strict validation and steps
Math & Statistics · Arithmetic & Percentages
Hex Converter
Convert hexadecimal to decimal, binary and octal and back, with the steps shown
Math & Statistics · General-Purpose
Scientific Calculator
Trig, logs, roots, powers and factorials with a DEG/RAD switch
Math & Statistics · General-Purpose
Math Calculator
Type a whole math problem and see the order of operations
Finance & Money · Investing & Savings
Interest Calculator
Simple interest, final amount, principal, rate or time, compared with compound growth
Math & Statistics · Statistics & Probability
Sample Size Calculator
Survey sample size for a proportion or mean, with finite population correction
Math & Statistics · Algebra
Algebra Calculator
Solve one linear equation, a 2x2 linear system or a quadratic, with exact fractions and every step
Math & Statistics · Calculus & Matrices
Integral Calculator
Approximate a definite integral numerically with trapezoid, midpoint and Simpson rules
Math & Statistics · General-Purpose
Graphing Calculator
Plot up to six functions of x, zoom and pan, and find the y-intercept, vertex and roots of simple polynomials
Math & Statistics · Calculus & Matrices
Matrix Calculator
Add, multiply, invert and take determinants of matrices up to 4x4
Date & Time · Work Hours & Time
Hours Calculator
Hours and minutes between two dates and times, minus a break
Date & Time · Work Hours & Time
Add Time Calculator
Add or subtract hours, minutes and seconds, and apply the total to a clock time
Date & Time · Counters & Countdowns
Countdown Calculator
Days, hours, minutes and seconds until a date and time in a chosen time zone
Health & Fitness · Pregnancy & Cycles
Due Date Calculator
Due date from last period, conception, IVF transfer or ultrasound
Health & Fitness · Pregnancy & Cycles
Pregnancy Calculator
Due date, weeks pregnant, trimester and milestone dates
Finance & Money · Everyday Spending
Tip Calculator
Tip, total and per-person share of a bill, with preset or custom tip and exact cent splitting
Games & Fun · Random Generators
Password Generator
Random passwords from your browser's secure randomness, with pool size and entropy
Games & Fun · Random Generators
Wheel Spinner
Spin a wheel of your own entries for a fair random winner
Games & Fun · Novelty & Pets
Snow Day Calculator
Score a snow day from your own forecast with a transparent points model
Games & Fun · Sports & Gaming
Dynasty Trade Calculator
Compare two sides of a fantasy trade using your own asset values and a depth discount
Date & Time · Age & Birthdays
Birthday Calculator
Age, next birthday, days until it, weekday born, days lived and zodiac sign
Date & Time · Time Zones
Time Zone Converter
Convert a date and time between time zones, with UTC offsets, daylight saving and day shift
Date & Time · Work Hours & Time
Military Time Converter
Convert 12-hour time to military time and back.
Games & Fun · Sports & Gaming
Parlay Calculator
Combine 2 to 12 legs of American or decimal odds into one payout, profit and implied probability
Math & Statistics · Physics & Chemistry
Chemistry Calculator
Molar mass from a formula, moles and grams, molarity and dilution
Conversions · Temperature
Fahrenheit to Celsius Converter
Convert degrees Fahrenheit to Celsius with the formula, oven settings and weather reference points
Conversions · Weight & Mass
KG to LBS Converter
Convert kilograms to pounds, ounces, stone and grams with the exact factor
Conversions · Volume & Capacity
Liters to Gallons Converter
Convert liters to US and imperial gallons, quarts, cups and fluid ounces side by side
Conversions · Length
CM to Inches Calculator
Convert centimeters to inches, fractions, feet and inches
Conversions · Currency & Units
Minutes to Hours Calculator
Convert minutes to decimal hours and h:mm, or hours to minutes
Conversions · Length
Feet to Meters Converter
Convert feet to meters with the exact 0.3048 factor, plus centimeters, millimeters and inches
Conversions · Length
Meters to Feet Converter
Convert meters to decimal feet and feet with inches using the exact 0.3048 factor
Conversions · Volume & Capacity
Quarts to Gallons Converter
Convert US quarts to gallons with pints, cups, fluid ounces and liters
Home & DIY · Heating & Cooling
BTU Calculator
Room cooling capacity in BTU/h, tons and kW from area, sun, people and kitchen
Date & Time · Date Math
Business Days Calculator
Count business days between two dates or add and subtract them, skipping weekends and your holidays
Math & Statistics · Geometry
Perimeter Calculator
Perimeter of a rectangle, square, triangle, circle, regular polygon or trapezoid
Math & Statistics · Geometry
Triangle Calculator
Solve a triangle from SSS, SAS or ASA/AAS: sides, angles, area and type
Math & Statistics · Arithmetic & Percentages
Prime Factorization Calculator
Prime factors with division steps, exponent form and prime check
Math & Statistics · Statistics & Probability
Margin of Error Calculator
Margin of error for a survey proportion, with optional population correction
Math & Statistics · Statistics & Probability
Confidence Interval Calculator
Confidence interval for a mean (z or t) or a proportion
Home & DIY · Rooms & Surfaces
Flooring Calculator
Flooring area, boxes and cost for up to six rooms, with a waste allowance
Home & DIY · Building Materials
Drywall Calculator
Drywall sheets for a wall or room, with openings, sheet size and waste
Home & DIY · Building Materials
Board Feet Calculator
Board feet and cubic feet of lumber from thickness, width, length and quantity
Home & DIY · Outdoor & Landscape
Paver Calculator
Pavers and pallets for a patio or path, with joint width and waste
Home & DIY · Rooms & Surfaces
Wallpaper Calculator
Wallpaper strips and rolls for a room, with roll size and pattern repeat
Finance & Money · Loans & Mortgages
Auto Loan Calculator
Monthly car loan payment, total interest and total cost with down payment, trade-in, tax and fees
Finance & Money · Loans & Mortgages
Personal Loan Calculator
Personal loan payment, total interest, net proceeds after the origination fee and effective APR
Home & DIY · Building Materials
Asphalt Calculator
Cubic yards and tons of asphalt for a driveway or lot, with waste and cost per ton
Finance & Money · Investing & Savings
Inflation Calculator
Future cost and purchasing power at an average inflation rate
Finance & Money · Investing & Savings
Annuity Calculator
Present value, future value or payment of a fixed-period annuity
Health & Fitness · Weight & Nutrition
BMR Calculator
Basal metabolic rate by Mifflin-St Jeor, with daily calories at each activity level
Health & Fitness · Weight & Nutrition
Body Fat Calculator
Body fat by the U.S. Navy method and BMI, with ACE categories and lean mass
Finance & Money · Loans & Mortgages
Refinance Calculator
Refinance payment before and after, closing costs, break-even months, interest difference and cash-out
Finance & Money · Loans & Mortgages
Rent vs Buy Calculator
Cumulative cost of renting versus buying a home by year, with break-even year
Finance & Money · Everyday Spending
Budget Calculator
Monthly income versus expenses, savings rate and a 50/30/20 comparison
Finance & Money · Investing & Savings
Retirement Calculator
Projected retirement balance and sustainable yearly income from savings, contributions and return
Health & Fitness · Weight & Nutrition
TDEE Calculator
Activity-adjusted daily energy needs (BMR × activity) with calorie targets for a deficit or surplus
Home & DIY · Building Materials
Siding Calculator
Siding squares and pieces from wall size, gables, openings and waste
Finance & Money · Loans & Mortgages
APR Calculator
APR of a loan with points and fees versus the note rate
Finance & Money · Investing & Savings
Investment Calculator
Investment growth with monthly contributions and a yearly table
Math & Statistics · Calculus & Matrices
Derivative Calculator
Symbolic derivative of f(x) with the rules shown, plus the slope and tangent line at a point
Math & Statistics · Geometry
Area Calculator
Area of a rectangle, triangle, circle, trapezoid, parallelogram, ellipse, polygon or sector in six units
Health & Fitness · Fitness & Sleep
Height Calculator
Predicted adult height from parents’ heights or a toddler’s height at age 2
Finance & Money · Loans & Mortgages
FHA Loan Calculator
FHA monthly payment with financed upfront MIP, annual MIP by HUD schedule, taxes and insurance
Finance & Money · Investing & Savings
401(k) Calculator
401(k) balance from salary, contribution percentage and employer match, with 2026 IRS limit checks
Conversions · Currency & Units
Unit Converter
Convert length, weight, volume, temperature, speed and area in one tool
Conversions · Currency & Units
Currency Converter
Convert money with your own exchange rate, add a margin or flat fee, or find how much to send
Games & Fun · Novelty & Pets
Birth Chart Calculator
Sun, Moon and planet signs, Ascendant, Midheaven and whole-sign houses from your birth date, time and place
Games & Fun · Sports & Gaming
Palworld Breeding Calculator
Find the Pal two parents breed, or list every parent pair for a target Pal
Math & Statistics · Calculus & Matrices
Calculus Calculator
One page for the symbolic derivative with tangent line or a numerical definite integral, with steps
Finance & Money · Investing & Savings
RMD Calculator
Required minimum distribution from the IRS Uniform Lifetime table, with start age and a short projection
Finance & Money · Paycheck & Benefits
Income Tax Calculator
Estimate 2026 US federal income tax by filing status, with a bracket breakdown
Date & Time · Work Hours & Time
Time Duration Calculator
Exact days, hours and minutes between two dates and times
Date & Time · Date Math
Date To Date Calculator
The span between two dates in days, weeks, months and years, with an include-last-day option
Date & Time · Work Hours & Time
Time Calculator
Add and subtract hh:mm:ss times, with the total in decimal hours
Date & Time · Work Hours & Time
Timesheet Calculator
Weekly time in and out with breaks, regular and overtime hours, and gross pay
Finance & Money · Loans & Mortgages
Home Loan Calculator
Compare a home purchase loan over 15, 20 and 30 years: payment with tax, insurance, HOA and PMI, interest and payoff date
Finance & Money · Investing & Savings
Social Security Calculator
Estimate your retirement benefit from AIME or average earnings, with full retirement age and claiming age 62 to 70