Health
Body metrics, nutrition, fitness, and pregnancy.
40 calculators
A1C to Average Glucose (eAG) CalculatorConvert HbA1c to estimated average glucose (eAG) using the ADAG formula: eAG (mg/dL) = 28.7 × A1C − 46.7. An A1C of 7% is about 154 mg/dL or 8.6 mmol/L.Army Body Fat Calculator — replaced by the WHtR standard (AD 2026-13)The Army abolished the body fat tape test on 1 July 2026. The ABCP standard is now waist-to-height below 0.55 — check yours and see the maximum waist for your height.BAC Calculator — estimate blood alcohol content (Widmark)Estimate your blood alcohol content (BAC) from body weight, sex, standard drinks and time using the Widmark formula. An estimate only — never use it to decide whether to drive.Blood Pressure Calculator — MAP & pulse pressureCalculate mean arterial pressure (MAP) and pulse pressure from a blood-pressure reading: MAP = diastolic + (systolic − diastolic) ÷ 3, pulse pressure = systolic − diastolic.BMI CalculatorCalculate your Body Mass Index from height and weight, with the WHO category, your healthy-weight range, BMI Prime, and Ponderal Index.BMR Calculator — basal metabolic rate (Mifflin-St Jeor)Estimate your basal metabolic rate — the calories your body burns at rest — with the Mifflin-St Jeor and Harris-Benedict equations from sex, age, height, and weight.Body Fat Calculator — US Navy method + ACE categoriesEstimate body fat percentage from tape measurements using the US Navy circumference method, with fat and lean mass and the ACE category for your sex.Body Surface Area Calculator — Mosteller & Du BoisEstimate body surface area (BSA) in m² from height and weight using the Mosteller and Du Bois formulas — used for drug dosing and cardiac index.Calorie Calculator — daily intake target from maintenanceWork out how many calories to eat per day: your maintenance energy from the FAO/WHO/UNU activity levels, plus the daily deficit or surplus you choose.Calories Burned Calculator — by activity, weight and time (MET values)Estimate the calories burned in a workout from your weight, the activity and how long you did it, using MET values from the Compendium of Physical Activities.Cholesterol Ratio Calculator — total/HDL & non-HDLCalculate your total-to-HDL cholesterol ratio (total ÷ HDL) and non-HDL cholesterol (total − HDL) from a lipid panel. Lower ratio is better; desirable non-HDL is below 130 mg/dL.Conception Date Calculator — when did I conceive?Estimate when you conceived from your due date. The calculator subtracts 266 days to find the likely conception date, shows the fertile window and the implied last period. A due date of Oct 8, 2026 points to conception around Jan 15, 2026.Due Date by Conception Calculator — from conception to due dateEstimate your due date from a known conception date. The calculator adds 266 days and shows the implied last period and trimester dates. Conception on Jan 15, 2026 gives a due date of Oct 8, 2026.Due Date Calculator — estimate your pregnancy due dateEstimate your due date from the first day of your last period. The calculator adds 40 weeks (280 days) and shows your estimated conception date and trimester milestones. An LMP of Jan 1, 2026 gives a due date of Oct 8, 2026.GFR Calculator — estimate kidney function (CKD-EPI 2021)Estimate your kidney function (eGFR) from serum creatinine, age and sex using the 2021 CKD-EPI race-free equation. An estimate only — discuss any result with your clinician.Heart Rate Zones Calculator — max HR and AHA training zones by ageFind your maximum heart rate and training zones in beats per minute from your age, using the American Heart Association's moderate (50–70%) and vigorous (70–85%) bands.Height Percentile Calculator for Children (CDC growth charts)See where a child's height sits for their age and sex on the CDC growth charts, ages 2 to 20 — the percentile, the z-score, and the height at each centile line.Ideal Weight Calculator — Devine, Robinson, Miller, HamwiEstimate ideal body weight from height and sex with the Devine, Robinson, Miller, and Hamwi formulas, alongside the evidence-based healthy-BMI weight range.Lean Body Mass & FFMI CalculatorCalculate lean body mass and fat-free mass index (FFMI) from your weight, height and body-fat percentage: lean mass = weight × (1 − body fat), FFMI = lean mass ÷ height².Macro Calculator — protein, carbs and fat in grams (DRI ranges)Split a daily calorie target into grams of protein, carbohydrate and fat using the Dietary Reference Intakes' acceptable ranges and the Atwater energy factors.Marathon Pace Calculator — target time to pace, with split scheduleEnter a target finish time for a 5K, 10K, half or full marathon and get the pace per km and mile you must hold, plus the even-pace split schedule to run it.Maximum Heart Rate Calculator — 220−age, Tanaka & Gulati formulasEstimate your maximum heart rate from age by three published formulas: the AHA's 220−age, Tanaka's 208−0.7×age, and Gulati's 206−0.88×age for women.Meal Calorie Calculator — calories from protein, carbs, fat and alcoholWork out the calories in a meal from its grams of protein, carbohydrate, fat and alcohol, using the Atwater factors — and see which one your calories actually come from.One-Rep-Max Calculator — estimate your 1RM from reps (Epley & Brzycki)Estimate your one-rep max from a weight and the reps you lifted, by the Epley and Brzycki formulas, with a table of training loads for 2–12 rep sets.Ovulation Calculator — find your fertile daysEstimate your ovulation day and fertile window from your last period and cycle length. Ovulation is about 14 days before your next period. For a 28-day cycle starting Jan 1, 2026, ovulation is around Jan 15.Pace Converter — min/km to min/mile, km/h and mphConvert a running pace between units: enter minutes and seconds per kilometre to get the pace per mile and the equivalent speed in km/h and mph.Pack Year Calculator — measure lifetime smokingCalculate pack years from packs smoked per day and years smoked. Pack years = packs per day × years. 1 pack a day for 10 years is 10 pack years.Period Calculator — predict your next period & fertile daysPredict your next period, its likely end, and your estimated ovulation and fertile window from your last period, cycle length and period length. An estimate for regular cycles — not reliable birth control.Pregnancy Calculator — how far along am I?Find out how many weeks pregnant you are from your last period. The calculator shows your gestational age in weeks and days, your trimester and your estimated due date.Pregnancy Weight Gain Calculator — IOM guidelinesFind your recommended total pregnancy weight gain from pre-pregnancy BMI, based on the IOM 2009 guidelines: 25–35 lb for normal weight, with ranges for underweight, overweight and obese.Protein Intake Calculator — grams per day from bodyweightWork out your daily protein in grams from bodyweight: the 0.8 g/kg RDA, plus the published ranges for building muscle and for endurance and strength athletes.Running Pace Calculator — pace per km & mile, speed, from distance and timeEnter a distance and a time to get your running pace per kilometre and per mile, your speed in km/h and mph, and the finish times that pace implies over 5K to marathon.Standard Drinks Calculator — alcohol units in a drinkCalculate how many US standard drinks are in a beverage from its volume and ABV. One standard drink = 14 g of pure alcohol (NIAAA): a 12 oz 5% beer, 5 oz 12% wine or 1.5 oz shot.Steps to Calories Calculator — how many calories your step count burnsConvert steps into calories burned from your body weight and walking pace, using published cadence-to-intensity values, with a 2,000–12,000 step ladder.Target Heart Rate Calculator — Karvonen (heart rate reserve) methodFind your target heart rate for a chosen intensity using the Karvonen heart-rate-reserve method, which factors in your resting heart rate for a more precise number.TDEE Calculator — total daily energy expenditure (FAO/WHO/UNU PAL)Estimate the calories you burn per day from sex, age, height, weight, and lifestyle, using the FAO/WHO/UNU physical activity levels rather than the usual uncited multipliers.VO2 Max Calculator — estimate aerobic fitness from the Cooper 12-minute runEstimate your VO2 max from the distance covered in a 12-minute all-out run using the Cooper test formula, with a reference ladder from unfit to well-trained.Waist-to-Height Ratio Calculator (NICE bands)Divide your waist by your height to gauge central fat. NICE classes 0.4–0.49 as healthy, 0.5–0.59 increased, and 0.6+ high — keep your waist under half your height.Waist-to-Hip Ratio Calculator (WHO cutoffs)Divide waist by hips to gauge fat distribution. WHO calls abdominal obesity a ratio above 0.90 for men or 0.85 for women; above 1.0 is high risk for either.Water Intake Calculator — the DRI total water Adequate IntakeHow much water you need per day, from the National Academies' Dietary Reference Intakes: 3.7 litres for men and 2.7 for women — total water, including what comes from food.