Get an instant answer — free, no signup. Every calculator shows its formula, explains the result, and hands you a next step you can actually track.
Your total daily energy expenditure — the calories you actually burn per day.
Free · no signupDaily calories to maintain, lose, or gain weight — with food-based targets.
Free · no signupA safe deficit and target calories for your weight-loss rate.
Free · no signupThe calories that keep your weight exactly where it is.
Free · no signupYour basal metabolic rate — calories burned at complete rest.
Free · no signupCalories burned for 100+ activities, by weight and duration.
Free · no signupYour resting metabolic rate — the calories you burn at rest.
Free · no signupDaily calories and a surplus to gain weight at your target rate.
Free · no signupDaily protein, carbs, and fat in grams — for your goal and diet style.
Free · no signupHow much protein you need per day, by body weight and goal.
Free · no signupYour daily hydration target, adjusted for exercise.
Free · no signupKeto macros — low carbs, protein by body weight, fat to fill.
Free · no signupHigh-protein macros for a calorie deficit, in grams per day.
Free · no signupBody mass index with healthy-range context — metric or imperial.
Free · no signupIdeal body weight by four standard formulas, honestly explained.
Free · no signupEstimate body-fat % with the U.S. Navy tape method.
Free · no signupYour fat-free mass index and its height-normalized score.
Free · no signupYour lean mass by the Boer, Hume, and James formulas.
Free · no signupYour waist-to-hip ratio and its WHO health-risk band.
Free · no signupBody fat % by the U.S. Navy circumference (tape) method.
Free · no signupBody fat % by the U.S. Army AR 600-9 tape method.
Free · no signupYour BSA by the Mosteller, Du Bois, and Haycock formulas.
Free · no signupEstimate blood alcohol by the Widmark formula. Estimate only.
Free · no signupYour 1RM from any set — Epley and Brzycki, with training percentages.
Free · no signupWhat your step count burns, based on your body weight.
Free · no signupYour age-predicted maximum heart rate (Tanaka and Fox).
Free · no signupYour five training zones by the Karvonen method.
Free · no signupEstimate your VO2 max from resting and maximum heart rate.
Free · no signupCalories burned running, by distance or time and your weight.
Free · no signupCalories burned on the treadmill, by speed, incline, and time.
Free · no signupCalories burned cycling, by effort, time, and body weight.
Free · no signupBedtimes and wake times aligned to 90-minute sleep cycles.
Free · no signup