Free BMI Calculator (Metric, Imperial, Stones) + Healthy Weight Range
Free BMI calculator — metric, imperial, or stones. See your WHO weight category, healthy-weight range for your height, Asian cutoffs, and teen BMI-for-age.
Weight Loss Calculators: BMI, TDEE, Macros, Timeline, WHR, Body Fat, and Ideal Weight
Seven free, browser-based weight-loss calculators in one place. Start with BMI to see where your current weight sits, use TDEE to set a sensible daily calorie target, split that target into protein, carb, and fat grams with the macro tool, project a realistic timeline to your goal weight, layer on the waist-to-hip ratio calculator to see how fat distribution adds a cardiometabolic-risk signal on top of BMI, run the U.S. Navy tape-method body-fat calculator for a composition readout, and use the ideal weight calculator to compare the four historical clinical formulas (Hamwi, Devine, Robinson, Miller) against the healthy BMI range at your height. Every tool runs in your browser — nothing is saved, nothing is sent anywhere.
TDEE and Calorie Deficit: A Beginner's Guide With Examples
Use the Mifflin-St Jeor formula to estimate your TDEE, then set a safe calorie deficit (10-25%) for steady, sustainable weight loss without crash dieting.
Macronutrient Calculator: Turn Your Calorie Target Into Protein, Carb, and Fat Grams
Use the free macronutrient calculator to split any daily calorie target into protein, carb, and fat grams. Pick a balanced, higher-protein, or lower-carb approach and see grams and percentages instantly, plus an honest look at why total calories still matter most.
How Long Does It Take to Lose Weight?
How long does it take to lose weight? Most people lose 0.5–2 lb per week. Use the timeline table and free calculator to estimate your timeline.
Waist-to-Hip Ratio Calculator (Free): WHO Risk Bands, Metric & Imperial, Waist-to-Height Bonus
Free waist-to-hip-ratio calculator with metric and imperial units, sex-specific WHO risk bands, and a waist-to-height ratio bonus. Includes step-by-step measuring instructions, evidence from Yusuf 2005 INTERHEART and the Emerging Risk Factors Collaboration, and what to do at each risk band.
Body Fat Percentage Calculator (Free): U.S. Navy Tape Method, Metric & Imperial, Sex-Specific
Free U.S. Navy tape-measure body-fat percentage calculator with metric and imperial units, sex-specific formulas, and ACSM healthy-range interpretation. Includes step-by-step measuring instructions, evidence from Hodgdon & Beckett 1984 and the DoD body-composition standard, and how the Navy method compares with BMI, BIA, DEXA, Bod Pod, and skinfolds.
Ideal Weight Calculator (Free): Hamwi, Devine, Robinson, Miller Formulas + Healthy BMI Range
Free ideal body weight calculator with all four historical clinical formulas (Hamwi, Devine, Robinson, Miller) plus a healthy BMI range readout. Metric and imperial units, sex-specific, with an honest note on when to use IBW and when to use the BMI range instead.
How to use them together
- Start with BMI to see whether your current weight sits in the WHO healthy range for your height and to set a realistic goal weight.
- Run the TDEE calculator to estimate how many calories you burn on a normal day, then subtract 300–500 kcal for a beginner-safe deficit.
- Split that target with the macro calculator so you know how many grams of protein, carbs, and fat to aim for — protein is the one that matters most for preserving muscle while you lose.
- Project the finish line with the timeline calculator so you know roughly how many weeks the plan will take and what a realistic weekly rate looks like.
- Layer on WHR to check where you carry the weight, not just how much of it there is — waist-to-hip ratio adds a fat-distribution signal that BMI misses.
- Add the body-fat calculator for a composition readout the scale cannot give you — the U.S. Navy tape method uses a fabric tape and your height to estimate body-fat percentage and, with your weight, fat mass and lean mass in pounds or kilograms.
- Compare the ideal weight calculator against the healthy BMI range for context — the four historical clinical formulas (Hamwi 1964, Devine 1974, Robinson 1983, Miller 1983) sit alongside the 18.5–24.9 BMI band so you can see how a single-number "ideal weight" fits inside the range modern clinical guidelines actually use.