100% free · no signup · runs in your browser
Track inches, not just pounds.
Ten evidence-based calculators, a 46-food nutrition index, and a private measurement tracker — every formula cited to CDC, NIH, or the original research.
- 10calculators
- 46foods indexed
- 0accounts needed
- 100%private inputs
Free health & fitness tools
- BMI CalculatorCheck your Body Mass Index and healthy weight range with the formulas the CDC uses. Open tool
- BMR CalculatorFind your Basal Metabolic Rate (calories burned at rest) using the Mifflin-St Jeor equation. Open tool
- TDEE CalculatorEstimate your daily maintenance calories from your stats and activity level. Open tool
- Macro CalculatorDaily calorie and protein/carb/fat targets based on your goal and activity level. Open tool
- Calorie Deficit & Goal-Date CalculatorProject when you will reach your goal weight based on your daily calorie deficit. Open tool
- Body Fat Calculator (U.S. Navy Method)Estimate body fat % from tape measurements with the U.S. Navy circumference method. Open tool
- Ideal Weight CalculatorCompare Devine, Robinson, Miller, and Hamwi ideal weight formulas plus your healthy BMI range. Open tool
- Waist-to-Hip Ratio CalculatorWaist-to-hip ratio with WHO risk categories and the NIH waist-risk threshold. Open tool
- Clothing Size ConverterConvert US / UK / EU clothing sizes for women’s dresses and men’s suits. Open tool
- Body Measurement TrackerLog measurements over time and track total inches changed — private, saved on your device. Open tool
How LoseSize works
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1
Enter your numbers
Your stats, a food, or today’s measurements — nothing is sent to a server.
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Get cited results
Every tool shows its formula and links the CDC, NIH, WHO, or journal source.
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Track what changes
Save entries in your browser, watch trends, export a CSV any time.
Why you can trust these numbers
Published formulas, cited
Mifflin-St Jeor, CDC BMI, the U.S. Navy method — the real equations, sourced beneath each tool.
Private by design
Calculations run on your device. Tracker entries stay in your browser’s local storage.
Information, not advice
Our tools estimate and inform; they never diagnose. Read our editorial policy and medical disclaimer.
The scale can’t see everything.
Start a private measurement log in under a minute — inches, ratios, and trends the mirror already knows about.