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Health & Body Calculators
BMI, body fat, ideal weight, sleep, blood pressure and general health calculators. 51 free tools that run in your browser, no sign-up needed.
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BMI CalculatorCalculate BMI and a healthy weight range.Sleep CalculatorFind the best bedtime or wake-up time using 90-minute sleep cycles.Body Fat CalculatorBody fat % with the US Navy and BMI methods, lean vs fat mass.Ideal Weight CalculatorCompare ideal body weight from the Robinson, Miller, Devine and Hamwi formulas.Weight Loss Percentage CalculatorWork out the percentage of body weight you have lost and track progress to your goal.Waist to Hip Ratio CalculatorWork out your waist-to-hip ratio and WHO health risk category for men and women.Ideal Gas Law CalculatorSolve PV = nRT for pressure, volume, moles or temperature with automatic unit conversion.Lean Body Mass CalculatorEstimate lean body mass, fat mass and body fat % with the Boer, James and Hume formulas.Pregnancy Weight Gain CalculatorSee your recommended pregnancy weight gain by BMI and week, using the IOM 2009 guidelines.Baby Percentile CalculatorWeight, length and head circumference percentiles for babies 0–24 months on WHO growth charts.Life Expectancy CalculatorEstimate remaining life expectancy from age and sex, with rough lifestyle adjustments.Blood Alcohol CalculatorEstimate BAC over time from your drinks with the Widmark formula, with peak and time to sober.A1C CalculatorConvert A1C % to estimated average glucose in mg/dL and mmol/L, and back.FFMI CalculatorFind your fat-free mass index and normalized FFMI from weight, height and body fat.Puppy Weight CalculatorEstimate your puppy's adult weight from its age, current weight and breed size.Growth Rate CalculatorTotal growth, compound growth rate per period, linear average and a projection.Army Body Fat CalculatorArmy tape test body fat (2023 one-site or legacy method) vs AR 600-9 standards by age.Blood Pressure CalculatorBlood pressure reading to AHA category, mean arterial pressure and pulse pressure.Waist to Height Ratio CalculatorWaist to height ratio in cm or inches with health bands and the 0.5 rule waist target.Alcohol Units CalculatorUK alcohol units from volume and ABV, plus a weekly total vs the 14-unit guideline.Barbell Plate CalculatorWhich plates to load on each side of the bar for any target weight, in kg or lb.GFR CalculatorEstimate eGFR from creatinine, age and sex with CKD-EPI 2021 and see the CKD stage.Mean Arterial Pressure CalculatorCalculate mean arterial pressure (MAP) and pulse pressure from a blood pressure reading.Body Shape CalculatorFind your body shape (hourglass, pear, apple, rectangle) from bust, waist and hip sizes.Child BMI CalculatorBMI and CDC BMI-for-age percentile for kids and teens 2–20, with weight category.Horse Weight CalculatorEstimate a horse's weight in kg and lb from heart girth and body length tape measurements.Quit Smoking Savings CalculatorMoney saved, cigarettes not smoked and health milestones since your quit date.Sun Position CalculatorSolar altitude, azimuth and shadow length for any place and time, with a daily sun chart.Tire Age CalculatorDecode the DOT tire date code to see when a tire was made, its age and when to replace it.Tree Age CalculatorEstimate how old a tree is from its trunk circumference and species growth factor.Yarn Yardage CalculatorEstimate yards or metres of yarn and skeins needed by project, size and yarn weight.Biological Age CalculatorEstimate your biological age from sleep, exercise, smoking, diet, BMI and blood pressure.Body Roundness Index CalculatorBRI from waist and height, with risk band chart, estimated body fat and visceral fat signal.Car Seat Stage FinderEnter age, weight and height to see which car seat stage your child needs, per AAP guidance.Child Height Percentile CalculatorFind a child's height-for-age percentile and z-score on the CDC growth chart, ages 2 to 20.Cycling Power CalculatorWatts needed for a speed, or speed from watts, using weight, gradient, CdA, Crr and wind.Diabetes Risk TestQuick type 2 diabetes risk score from age, family history, blood pressure, activity and weight.Ergonomic Desk Height CalculatorIdeal sitting and standing desk, chair, keyboard and monitor height from your height.Eyeglass Prescription ExplainedTurn SPH, CYL, AXIS, ADD and PD into a plain-English explanation of your glasses prescription.Heart Disease Risk CalculatorFramingham 10-year heart disease risk and heart age from cholesterol, BP, smoking and diabetes.Meat Temperature GuideUSDA safe internal temperature, doneness, pull temp, carryover and rest time for any meat.Metabolic Age CalculatorEstimate your metabolic age by comparing your BMR with healthy-weight averages for each age.Passer Rating CalculatorCalculate NFL quarterback passer rating and NCAA passing efficiency from a stat line.Relative Fat Mass CalculatorEstimate body fat % from height, waist and sex with the RFM formula, and compare it with BMI.Running Route Distance CalculatorClick on a map to draw a running, walking or cycling route and get distance, laps and finish time.Skinfold Body Fat CalculatorBody fat % from caliper readings: Jackson-Pollock 3, 4, 7-site and Durnin-Womersley.Strength Standards CalculatorYour lift level (beginner to elite) and bodyweight ratio from lift, body weight, sex and age.Sugar Intake CalculatorYour daily added sugar limit in grams and teaspoons (AHA and WHO), compared with your intake.Swimming Laps CalculatorHow many laps or lengths make a mile or km in a 25 yd, 25 m or 50 m pool, and laps to miles.Weight TrackerLog weigh-ins and see a 7-day average chart, weekly trend and projected goal date.Win Percentage CalculatorTurn a win-loss-tie record into a win percentage and see the wins needed to hit a goal.
About Health & Body Calculators
Check BMI, body fat, ideal weight, sleep cycles and other body measurements. These are screening and planning tools, not a diagnosis; talk to a health professional about any results that concern you.
Most used here: BMI Calculator, Sleep Calculator and Body Fat Calculator.