easyonlinecalculator

Health Calculators

Health and fitness calculators for calories, macros, BMI, pregnancy and cycle dates, running pace, strength and sleep. Each tool shows the formula it uses and runs in your browser with no sign-up. Results are general estimates, not medical advice, and they have not been reviewed by a medical professional. Talk to a doctor or other qualified health professional about your own situation.

Last updated October 23, 2026

Featured tools

All Health & Fitness calculators

Weight & Nutrition

Calories, macros, protein and ideal weight

Pregnancy & Cycles

Due dates and cycle tracking

Fitness & Sleep

Pace, strength and sleep planning

Medical & Safety

Blood alcohol and body surface area

Frequently asked questions

Are these calculators medical advice?

No. They give general estimates from published formulas and cannot diagnose or treat anything. Ask a health professional about your own health.

How are calories and BMI calculated?

The Calorie Calculator uses the Mifflin-St Jeor equation and the BMI Calculator divides weight by height squared. Each page explains its formula.

How accurate are the pregnancy and cycle dates?

They are estimates based on average timing. Cycles and pregnancies vary, so real dates can differ.

Do these calculators store my numbers?

No. Every calculation runs in your browser and nothing you enter is saved or uploaded.