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Health & Fitness

Free Health & Fitness Calculators

Calculate calories, macros, BMI, pregnancy due dates, and ovulation with free health and fitness calculators built on medical-standard formulas.

5 tools, all free, no sign-up

Calorie Calculator

Calculate your TDEE and daily calorie needs. Get personalized targets for weight loss, maintenance, or gain. Uses Mifflin-St Jeor and Harris-Benedict formulas.

CalculatorHealth

Pregnancy Calculator

Calculate due date from last period or conception date. Track fetal development week by week with milestones.

CalculatorHealth

Macro Calculator

Calculate daily macros (protein, carbs, fat) based on TDEE and fitness goal. Supports cutting, bulking, maintenance with keto and low-carb presets.

CalculatorHealth

BMI Calculator

Calculate BMI in metric or imperial units. Get ideal weight range and health risk assessment based on BMI categories.

CalculatorHealth

Ovulation Calculator

Calculate ovulation date and fertile window from last period. Track best days to conceive for pregnancy.

CalculatorHealth
A health calculator is a tool that translates personal numbers, height, weight, age, activity level, into figures you can act on: daily calorie targets, BMI category, macro splits, or a pregnancy due date. They are used by people starting a diet or training plan, and by anyone tracking a pregnancy or fertile window who wants a date estimate without waiting for a clinic visit. A concrete example: someone starting a calorie deficit wants to know their TDEE and a realistic daily target before they start logging food, rather than picking a round number from a fitness post. These calculators use recognized formulas, Mifflin-St Jeor for calorie needs, standard BMI categories, and are meant as a planning estimate, not a medical diagnosis; confirm health decisions with a doctor.

Frequently Asked Questions

Should I use the Calorie Calculator or the Macro Calculator first?▾
Start with the Calorie Calculator to get your total daily energy needs (TDEE). Then use the Macro Calculator to split that total into protein, carbs, and fat based on your goal.
What is the difference between the Pregnancy Calculator and the Ovulation Calculator?▾
The Ovulation Calculator predicts your fertile window before conception, based on your cycle. The Pregnancy Calculator estimates your due date and fetal development after conception, based on your last period or conception date.
Are these health calculators a substitute for medical advice?▾
No. They use standard, recognized formulas for planning purposes, but any decision about diet, pregnancy, or fertility should be confirmed with a doctor.
Are these Health & Fitness tools free to use?▾
Yes, all 5 tools in this category are completely free. No sign-up, no account, and no payment required. Every tool works instantly in your browser.
Do these tools work on mobile phones?▾
Yes. All tools are mobile-responsive and work on iOS, Android, and desktop browsers. Touch events are supported where applicable.
Is my data sent to a server?▾
It depends on the tool, so each tool page says which it is. Most run entirely in your browser and send nothing. Some fetch public data to work, such as price charts and currency rates. A few, like the dynamic QR generator, need an account and store what you create, because that is the feature.
How many Health & Fitness tools are available?▾
There are 5 tools in this category. All are free and require no sign-up. Browse the list above to find the tool you need.