Health
Health: BMI, calories, water, pregnancy. Free, simple calculators with no sign-up.
Health
- BMI calculator (body mass index)An adult’s BMI from height and weight, with the WHO category.
- BMI weight range for a heightThe weights that match a BMI of 18.5 to 24.9 for an adult height.
- Basal metabolic rate (BMR) estimateThe energy the body uses at rest, estimated with two well-known formulas.
- Daily energy needs (estimate)A range of calories used in one day, from body size and activity.
- Macronutrient splitTurn a calorie intake into grams of carbs, protein and fat.
- Daily carbohydrate guideHow many grams of carbs a share of the day’s energy represents.
- Body fat estimate (US Navy method)An estimated body fat percentage from a tape measure: neck, waist and hips.
- Historical military body-fat formula estimatesCompare two older tape formulas (US Army 2023 and DoD 2002) that no longer reflect current official methods.
- One-rep max estimate (1RM)Estimate your one-repetition maximum from a lighter set.
- Heart rate zonesYour indicative training zones from your age and resting pulse.
- Protein intake guideA daily protein range based on your weight and activity.
- Fat intake guideTurn a share of fat (in % of energy) into grams per day.
- Total daily energy expenditureEstimate the calories you burn per day from your basal metabolic rate.
- Body surface areaEstimate body surface area in m² with the Mosteller and Du Bois formulas.
- Ovulation window estimateEstimate your ovulation date and most fertile days from your last period.
- Conception window estimateEstimate the likely conception period from the last period or the due date.
- Period calendar estimateEstimate the dates of your next periods, with an uncertainty margin.
- Weight references for a height, and their limitsCompare old “reference weight” formulas with the WHO BMI band, with no target to reach.
- Estimated lean body mass (Boer, James, Hume)Estimate an adult’s lean body mass with three named formulas, from height and weight.
- Energy used by an activity (MET)A range of calories burned during an activity, using the MET method.
- Pregnancy milestones: weeks, trimesters and key datesHow many weeks pregnant at a date, the trimester and key dates, from the last period or the due date.
- Estimated due date (Naegele’s rule)Estimate the due date from the last period, the conception date or a scan.
- Pregnancy weight gain references (IOM 2009)The weight gain references published by the Institute of Medicine by pre-pregnancy BMI.
- Estimate of the conception period of a pregnancyEstimate the likely conception period from the due date or a pregnancy dating.
- Running pace calculator (min/km and min/mile)Find the pace, time or distance of a run, in kilometres or miles.
- Estimated glomerular filtration rate (CKD-EPI 2021)Estimate the GFR from blood creatinine with the race-free CKD-EPI 2021 equation.
- Waist-to-height and waist-to-hip ratiosCalculate two descriptive body ratios from tape-measure readings.
- Indicative blood alcohol estimate (Widmark formula)An indicative range of blood alcohol content, which is never a permission to drive.
- Low BMI: understanding it and where to find helpRead a low BMI with care and find help resources, never with a weight to reach.
- Understanding BMI references and their limitsCalculate a BMI and read what the WHO references say, and do not say, depending on the situation.
- Transparent nutrition references per 100 gAn in-house, fully documented indicator comparing a food with European reference intakes.