Health
BMI, calorie needs and other metrics. Mass in {{mass}}, height in cm or in. Units from header (default USA).
Other
Blood alcohol
Estimated blood alcohol level.
Use calculator →BMI (body mass index)
Weight and height; optional sex and activity (interpretation context). Nomogram chart: weight vs height with constant-BMI curves.
Use calculator →BMI and muscle mass
Interpretation for athletes.
Use calculator →BMI for children (percentile)
Interpretation of child BMI.
Use calculator →BMR (basal metabolic rate)
BMR (Mifflin–St Jeor): weight in lb, height in in; result in kcal/day.
Use calculator →BMR (Katch-McArdle)
BMR with known body fat %.
Use calculator →Body fat (US Navy method)
Body fat % — Navy method.
Use calculator →Body fat percentage
BF% from circumferences and height (US Navy); girths in {{length}}, height in in; result in %.
Use calculator →Body mass index (BMR, TDEE)
Same BMI formula and WHO cut-offs as the basic calculator; optional BMR, TDEE, estimated body fat % and weight band for BMI 18.5–25.
Use calculator →Body surface area (BSA)
Body Surface Area — Mosteller formula.
Use calculator →Calorie deficit
How much to eat to lose weight.
Use calculator →Calorie surplus
Target kcal/day = TDEE + surplus; optional profile TDEE (Mifflin × PAL), BMR, PAL, surplus as % of TDEE and est. lb/week gain.
Use calculator →Calories — cycling
MET × mass × time — weight as lb in the header. Avg kcal/min; optional BMR, TDEE and % of TDEE.
Use calculator →Calories — gym
MET × mass × time — weight as lb in the header. Avg kcal/min; optional BMR, TDEE and % of TDEE.
Use calculator →Calories — swimming
Estimated kcal burned swimming.
Use calculator →Calories — walking
Estimated kcal burned while walking.
Use calculator →Calories — yoga
Estimated kcal burned doing yoga.
Use calculator →Calories burned at rest
Low MET × mass × time (e.g. sitting). Not BMR alone — weight as lb in the header; optional BMR, TDEE and % of TDEE.
Use calculator →Calories burned running
Estimated kcal burned while running. Enter lb and mi as shown in the page header.
Use calculator →Carbohydrates in diet
Carb grams/day from kcal and carb %; optional BMR, TDEE and carb kcal as % of TDEE.
Use calculator →Daily sodium (mg)
Sodium (mg) × factor; result in mg—compare with daily guidance (mg/day).
Use calculator →Due date (pregnancy calculator)
Estimated due date from first day of last period (Naegele's rule), with optional cycle-length adjustment.
Use calculator →Fat in diet
Fat grams/day from kcal and fat %; optional BMR, TDEE and fat kcal as % of TDEE.
Use calculator →FFMI (fat-free mass index)
Fat-Free Mass Index.
Use calculator →Glycaemic load
IG × carbohydrates / 100.
Use calculator →Heart rate and oxygen
VO₂max estimate from resting HR and age (Tanaka HRmax 208−0.7×age; correlation formula, not a lab test).
Use calculator →Heart rate zones (training)
HRmax ≈ 220 − age; 50–90% of HRmax thresholds in bpm.
Use calculator →Hydration (glasses)
Weight in lb × ml/kg/day; glasses from {{cup_measure}} (250 ml metric, 240 ml US).
Use calculator →Hydration during exercise
Extra training fluids from lb and duration; result in gal (internally ml × 5 ml/kg/h).
Use calculator →Ideal weight (Devine)
Devine formula (e.g. for medication).
Use calculator →Ideal weight (Lorentz)
Estimated healthy body weight.
Use calculator →Macros — daily protein
Protein (g/day) = weight in lb × coefficient (g/kg or g/lb per header); kcal from protein ~4×g; optional BMR, TDEE and % TDEE.
Use calculator →Maximum heart rate
Estimated HRmax ≈ 220 − age (bpm); a rule of thumb, not a lab test.
Use calculator →MET × minutes (calories burned)
kcal ≈ MET × mass × time (h) — lb from header; kcal/min; optional BMR, TDEE and % TDEE.
Use calculator →Metabolic age (est.)
Based on BMR.
Use calculator →Net carbohydrates
Net carbs = total carbs − fibre; amounts in {{kitchen_mass}} per serving.
Use calculator →Pregnancy — weight gain
Estimated healthy weight gain in pregnancy.
Use calculator →Protein requirement
Daily protein (g) by body weight and activity.
Use calculator →Recovery (heart rate)
HRR = peak heart rate − heart rate after 1 min rest (bpm); both in the same units.
Use calculator →Resting heart rate
Resting HR band (bpm)—rough guide, not an ECG.
Use calculator →Saturated fat (g)
Limit for saturated fat (%).
Use calculator →Sleep cycles
Full sleep cycles from time asleep (min); one cycle ≈ 90 min (internally min ÷ 90).
Use calculator →Sugar and fat (kcal)
Energy from sugar/fat.
Use calculator →Target heart rate (training)
Target HR = HRmax × zone % (enter 0–100 or a decimal).
Use calculator →TDEE (total daily expenditure)
Daily calorie need with activity.
Use calculator →TDEE from BMR
TDEE = BMR × activity factor.
Use calculator →Water and weight
Estimated daily fluid volume from weight and coefficient: weight in lb; coefficient is ml/kg (metric) or ml/lb (US); output in gal from the header (internally ml = mass in kg × ml/kg).
Use calculator →Water requirement
Estimated fluids per day (~30 ml/kg body weight); weight as lb, output in gal from the header.
Use calculator →Weight change per week
Total mass change over n weeks at a constant daily deficit (kcal); ~7700 kcal/kg rule. Result in lb from the header.
Use calculator →WHR (waist/hip)
Waist-to-hip ratio.
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