Health calculators that make sense.
Free BMI, calorie, ideal-weight and calorie-deficit calculators backed by the same formulas dietitians use, with a clear, jargon-free readout.
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- Free, no sign-up
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- Evidence-based tools
- Cited
- Peer-reviewed sources
Our calculators
Four tools that cover almost every daily question about weight, calories and body composition.
BMI Calculator
Body Mass Index with a colour-coded health range and your healthy weight band.
Calorie Calculator
Mifflin-St Jeor TDEE with a macro breakdown and goal adjustments.
BMR Calculator
Calories burned at rest via Mifflin, Harris-Benedict and Katch-McArdle.
Ideal Weight Calculator
Compare Devine, Robinson, Miller and Hamwi, plus your healthy BMI range.
Macro Calculator
Turn your calories into protein, carbs and fat. Balanced, keto, or custom.
Protein Calculator
Daily protein grams by goal, plus per-meal portions and food sources.
Exercise Calories
45+ activities with MET values. Calories burned by your weight and duration.
Calorie Deficit Calculator
Set a safe weekly rate, see a timeline and macro split for fat loss.
Meal Planner
Instant 1-day or 7-day meal plans that fit your calorie and diet targets.
Body Fat Calculator
U.S. Navy tape method. Estimate body-fat percentage with just a tape measure.
Lean Body Mass
Boer, James and Hume formulas with an estimated fat-mass comparison.
Waist-to-Height Ratio
Keep your waist less than half your height. A strong metabolic-risk screen.
Water Intake
Daily ml target adjusted for your bodyweight, activity and climate.
One Rep Max
Estimate your 1RM from a submaximal set plus a full %-of-max table.
Weight Tracker
Log your weight, see the 7-day average and trend. Stored privately in your browser.
Quick unit converters
Everyday conversions most people Google first.
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Built on formulas dietitians actually use
Every number on NutriMeasure comes from a peer-reviewed equation or an authoritative guideline, not a content farm.
- Mifflin-St Jeor for Basal Metabolic Rate, today's clinical gold standard.
- Harris-Benedict activity multipliers (1.2–1.9) for converting BMR into daily calorie needs.
- NHLBI BMI categories for weight-status classification.
- ~7,700 kcal / kg fat approximation for realistic loss timelines.
A quick example
A 32-year-old woman, 165 cm, 70 kg, moderately active:
Try any calculator to get the same readout for your numbers.
Three numbers, thirty seconds, a clearer picture.
Start with BMI. Calorie targets and ideal-weight breakdowns are one click away.
Frequently asked questions
Are the NutriMeasure calculators free?+
Yes. Every calculator on NutriMeasure is free, requires no sign-up, and runs entirely in your browser. We don't store any numbers you enter.
Which formulas do you use?+
BMI uses the standard kg/m² formula. Calories use the Mifflin-St Jeor equation (1990) with the standard Harris-Benedict activity multipliers (1.2–1.9). Ideal weight compares Devine, Robinson, Miller and Hamwi. Deficits assume about 7,700 kcal per kilogram of body fat (Wishnofsky, 1958).
Can I switch between metric and imperial?+
Every calculator supports both. Toggle the unit switch and your entered values convert automatically.
Is my data private?+
Yes. All calculations run on your device. We never send your height, weight or age to a server.