Fast, modern health calculators — no sign‑up, no tracking.

Pick a calculator below. Everything runs locally in your browser—your inputs are never sent to a server. If you want, you can save results to a private on‑device history and clear it anytime.

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Fitness

BMI Calculator

Estimate Body Mass Index from height and weight (metric or imperial) and see category + healthy weight range.

Simple • Instant • Metric/Imperial

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Calorie Needs Calculator

Estimate daily calories to maintain, lose, or gain weight using BMR + activity level. Supports goal rate.

Advanced • Goals • Activity

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Body Fat Calculator

Estimate body fat percentage using common measurement methods. (Placeholder page for now.)

Coming soon • Methods • Metric/Imperial

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BMR Calculator

Estimate Basal Metabolic Rate (BMR) and resting calories burned per day.

Coming soon • Resting energy

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Ideal Weight Calculator

Estimate an “ideal” body weight range using common reference formulas.

Coming soon • Reference formulas

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Army Body Fat Calculator

Estimate body fat % using U.S. Army tape measurements.

Coming soon • Tape method

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Lean Body Mass Calculator

Estimate lean body mass (LBM) based on height and weight.

Coming soon • Body composition

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Healthy Weight Calculator

Estimate a healthy weight range for a given height.

Coming soon • Range

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Calories Burned Calculator

Estimate calories burned for common activities.

Coming soon • Activity

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One Rep Max Calculator

Estimate your 1RM for strength training from reps + weight.

Coming soon • Training

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Target Heart Rate Calculator

Estimate target heart rate zones based on age.

Coming soon • Zones

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Pregnancy

Pregnancy Calculator

Estimate pregnancy timeline and key dates from due date, LMP, ultrasound, conception, or IVF transfer.

5 methods • Timeline • Milestones

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Pregnancy Weight Gain Calculator

Estimate recommended weight gain week by week based on pre-pregnancy BMI and IOM guidelines.

IOM 2009 • Metric/Imperial • Twins

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Pregnancy Conception Calculator

Estimate when conception occurred from your due date, last period, or ultrasound dating.

3 methods • Fertile window

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Due Date Calculator

Estimate due date from LMP, conception, ultrasound, or IVF. Shows weeks, trimester, and key dates.

Date‑based • Timeline • Export

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Ovulation Calculator

Estimate ovulation day and fertile window for the next 6 cycles. Shows due dates if conceived.

6 cycles • Fertile window • Due dates

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Conception Calculator

Find your best days to conceive for the next 6 cycles with corresponding due dates.

6 cycles • Best days • Due dates

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Period Calculator

Predict your next period, ovulation, and fertile window for the next 12 cycles.

12 cycles • Ovulation • Fertile window

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Overall

TDEE Calculator

Estimate Total Daily Energy Expenditure (maintenance calories) from BMR + activity. Includes a quick explanation and ranges.

Medium • Maintenance • Great for planning

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Macro Calculator

Estimate macro targets (protein, carbs, fat) based on calorie goals.

TDEE-based • 5 diet styles • Per-gram targets

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Carbohydrate Calculator

Estimate daily carbohydrate intake targets.

IOM guidelines • 45–65% range • Goal-based

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Protein Calculator

Estimate protein intake targets based on goals and body weight.

Weight-based • 7 goals • RDA reference

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Fat Intake Calculator

Estimate fat intake targets based on calorie goals.

20–35% range • Saturated fat limits

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GFR Calculator

Estimate glomerular filtration rate (kidney function) using common equations.

CKD-EPI 2021 • CKD staging • Race-free

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Body Type Calculator

Estimate body type based on measurements.

Bust/Waist/Hip • WHR • Shape classification

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Body Surface Area Calculator

Estimate body surface area (BSA) using common formulas.

5 formulas • Du Bois • Mosteller

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BAC Calculator

Estimate blood alcohol concentration based on drinks and time.

Widmark formula • Impairment levels

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