Health & Fitness Calculators

Standard, published formulas for body measurements, nutrition, training and pregnancy dates. They are general estimates, not medical advice: talk to a health professional about your situation.

31 calculators · Formulas shown · Free

Body & weight 9

BMI Calculator Body mass index with the adult category, healthy weight range and child percentiles. Body Fat Calculator Body fat % from tape measurements or BMI, with fat mass, lean mass and ACE category. Ideal Weight Calculator Robinson, Miller, Devine and Hamwi formulas compared with the healthy BMI range. Healthy Weight Calculator The weight range for BMI 18.5 to 24.9 at your height, and how far you are from it. Lean Body Mass Calculator Lean body mass by the Boer, James, Hume and Peters formulas, with implied body fat. Army Body Fat Calculator The Army waist-to-height standard (AD 2026-13) and the former one-site tape estimate. Overweight Calculator How far your weight is from the healthy BMI range, with BMI boundaries and waist-to-height. Height Calculator Child’s predicted adult height from the parents’ heights, plus a ft/in ↔ cm converter. Body Type Calculator Hourglass, pear, inverted triangle, rectangle or apple, from four tape measurements.

Calories & nutrition 9

Calorie Calculator Daily calories to maintain, lose or gain weight, by formula and activity level. Macro Calculator Grams of protein, carbs and fat from your calories and a macro split. BMR Calculator Basal metabolic rate by three formulas, in kcal and kJ a day. TDEE Calculator Total daily energy expenditure at every activity level, in kcal and kJ. Protein Calculator Daily protein in grams from body weight, for adults, active people, over-65s and pregnancy. Calories Burned Calculator Calories burned by 60 activities from duration and body weight, using Compendium METs. BAC Calculator Rough blood alcohol estimate and time to zero. Never use it to decide whether to drive. Carbohydrate Calculator Daily carbs in grams from your calories, with the RDA minimum and a fiber target. Fat Intake Calculator Daily fat in grams from your calories, with the saturated fat limit.

Fitness & sleep 4

Sleep Calculator Bedtimes and wake-up times in sleep cycles, with recommended hours by age. Pace Calculator Pace per km and mile, finish time, distance, splits and race-time predictions. Target Heart Rate Calculator Maximum heart rate, AHA moderate and vigorous targets, and training zones. One-Rep Max Calculator Estimated 1RM from five equations, with training loads from 50% to 100%.

Pregnancy & cycle 7

Pregnancy Calculator How far along you are, trimester, due date and a milestone timeline. Due Date Calculator Estimated due date from your last period, conception or IVF, with term windows. Ovulation Calculator Estimated ovulation day and fertile window for the next six cycles. Period Calculator Your next 12 period dates with fertile windows, from your last period. Conception Calculator When to try to conceive for a target due date or birth month. Pregnancy Conception Calculator When you probably conceived, from your due date, last period or a scan. Pregnancy Weight Gain Calculator IOM 2009 weight-gain ranges by pre-pregnancy BMI, for one baby or twins.

Clinical formulas 2

Body Surface Area Calculator BSA by the Mosteller, Du Bois, Haycock, Gehan & George and Boyd formulas. GFR Calculator eGFR by CKD-EPI 2021 (creatinine or creatinine–cystatin C) or bedside Schwartz, with KDIGO category.

About these health calculators

Each calculator uses a standard, published formula, named on its page, so you can see exactly how the number was produced. Formulas like BMI, BMR and body-fat estimates are screening tools for adults in general: they can't account for everything about an individual, such as muscle mass, age, pregnancy or medical conditions.

This is not medical advice. Use the results as a starting point for a conversation with a doctor, registered dietitian or other qualified health professional, especially before changing your diet or exercise routine, or if you are pregnant.