Simple Calculator
A calculator with only what you need: numbers, add, subtract, multiply and divide. Big keys, keyboard support and a tape of your recent calculations.
Last updated October 20, 2026
History
Your calculations will appear here.
Result
= 24
How it adds up
× and ÷ are done before + and −, left to right
Type a sum the way you would write it, such as 15 × 4 − 10, and press = or Enter. Multiplication and division are done before addition and subtraction, so 15 × 4 − 10 is 60 − 10 = 50.
Whole-number results are exact up to 9,007,199,254,740,991; beyond that, or after passing through such a number, they show ≈. Decimals show 12 significant digits, so 0.1 + 0.2 shows 0.3 and 1 ÷ 3 × 3 shows 1. For brackets, percent and powers, use the basic calculator.
See how we calculate for the formulas, sources and review schedule behind every calculator.
Order of operations and left-to-right sums
Multiplication and division are always done before addition and subtraction, so 2 + 3 × 4 is 14 and not 20. When operations of the same kind follow each other, the calculator works from left to right. That makes 10 − 4 − 3 equal to 3, because 10 − 4 = 6 and then 6 − 3 = 3. It is not 9, which is what you would get by subtracting 4 − 3 first.
The same rule applies to division. 100 ÷ 5 × 2 is 20 × 2 = 40, and 8 ÷ 2 × 4 is 4 × 4 = 16. If you meant to divide by the whole product, work it in two steps, for example 5 × 2 = 10 and then 100 ÷ 10 = 10, using the tape to reuse the first answer.
Everyday sums: shopping, bills and sharing costs
A simple calculator is the right tool for totals you could do on paper but would rather not. For a basket of 3 items at 4.25 and 2 items at 1.50, enter 3 × 4.25 + 2 × 1.5 and read 15.75. Because the multiplications come first, no brackets are needed.
To share a bill, add up the total first and then divide. A meal of 86.40 plus a 12.60 tip is 86.40 + 12.60 = 99, and 99 ÷ 4 = 24.75 each for four people. Tap the 99 on the tape to carry it into the next line instead of retyping it.
Decimals, rounding and checking your answer
Whole-number answers are exact up to 9,007,199,254,740,991. Beyond that a calculator skips some whole numbers, so they show ≈, and so does a calculation that passes through such a number even if the final integer is exact. Decimals are shown to 12 significant digits, and a rounded one carries ≈ instead of =: 1 ÷ 3 appears as ≈ 0.333333333333 and 2 ÷ 3 as ≈ 0.666666666667. Rounding also removes the tiny errors computers make with decimals, so 0.1 + 0.2 shows 0.3 and 1 ÷ 3 × 3 shows 1. Huge or tiny answers switch to e notation.
A quick estimate catches most typing mistakes. 48 × 19 is close to 50 × 20 = 1,000, so an answer of 912 is believable and 9,120 is not. You can also run the sum backwards: 912 ÷ 19 gives 48, which confirms the first result. Addition and subtraction check each other in the same way: if 8 + 5 = 13, then 13 − 5 must return 8.
How to use the Simple Calculator
- Tap the keys or type on your keyboard.
- Press = or Enter to add the calculation to the tape.
- Tap a line on the tape to reuse its answer, or press C to clear.
Worked example
To find the cost of 15 packs at $4 each less a $10 coupon, enter 15 × 4 − 10. The multiplication is done first, 15 × 4 = 60, then 60 − 10 = 50, so you pay $50. To check, 15 × 4 is the same as 4 × 15, and 60 − 10 gives the same 50 either way. A second example: with 24 pens at 0.85 each and a 5 refund, 24 × 0.85 − 5 = 20.4 − 5 = 15.4.
| Calculation | Result |
|---|---|
| 8 + 5 | 13 |
| 9 − 12 | −3 |
| 6 × 7 | 42 |
| 100 ÷ 8 | 12.5 |
| 15 × 4 − 10 | 50 |
| 2.5 × 4 | 10 |
| 1 ÷ 3 × 3 | 1 |
Frequently asked questions
Can I type with my keyboard?
Yes. Type numbers and the + - * / keys, press Enter for the answer, Backspace to delete and Escape to clear.
Does it do multiplication before addition?
Yes. 2 + 3 × 4 is 14, because 3 × 4 is worked out first.
Why is 10 − 4 − 3 equal to 3?
Subtraction is worked from left to right: 10 − 4 = 6, then 6 − 3 = 3. The calculator does not group the later numbers first, which would give 9.
Is there a calculator with brackets and percent?
Yes, the basic calculator supports brackets, percent and powers.
What about dividing by zero, and are my sums stored?
Dividing by zero shows an error message instead of a result. Everything runs in your browser and the tape is cleared when you leave the page, so nothing is stored or uploaded.