Fitness and Health Calculators
BMI, calories, body fat, pregnancy dates, macros and training numbers. Every tool is free, runs in your browser and shows the formula behind the answer.
Fitness
- BMI CalculatorEnter your height and weight in this BMI calculator to find your body mass index, the WHO weight category it falls in and the healthy weight range for your height.
- Calorie CalculatorThis calorie calculator estimates how many calories your body uses in a day and how many to eat to maintain your weight, lose weight or gain weight at a steady pace.
- Body Fat CalculatorThis body fat calculator estimates your body fat percentage from a few tape measurements using the U.S. Navy method, and compares it with a BMI-based estimate and an ideal range for your age.
- BMR CalculatorThis BMR calculator estimates your basal metabolic rate, the energy your body needs each day at complete rest, and shows how many calories you burn at different activity levels.
- Ideal Weight CalculatorThis ideal weight calculator applies four widely used ideal body weight (IBW) formulas to your height and gender and shows the weight range that keeps your BMI in the healthy zone.
- Pace CalculatorUse this pace calculator to work out your running, walking or cycling pace from time and distance, or to find the time or distance for a given pace. It converts between per-mile, per-kilometer and speed units.
- Army Body Fat CalculatorThis Army body fat calculator applies the one-site abdominal tape equation adopted by the US Army in 2023 to estimate your body fat percentage and check it against the Army standard for your age and sex.
- Lean Body Mass CalculatorThis lean body mass calculator estimates how much of your weight is not body fat, using three published adult formulas or a pediatric formula for children 14 and younger.
- Healthy Weight CalculatorEnter your height in this healthy weight calculator to see the range of body weights that corresponds to a healthy adult BMI of 18.5 to 25.
- Calories Burned CalculatorPick an activity, enter how long you did it and your body weight, and this calories burned calculator estimates the energy you used with standard MET values.
- One Rep Max CalculatorThis one rep max calculator estimates the heaviest weight you could lift for a single repetition, based on a weight you lifted for several reps, and lists training loads at common percentages of your 1RM.
- Target Heart Rate CalculatorThis target heart rate calculator estimates your maximum heart rate and the heart rate ranges for each exercise intensity zone, optionally using your resting heart rate.
- Overweight CalculatorEnter your height and weight in this overweight calculator to see whether your body mass index falls in the normal, overweight or obese range for adults.
- Anorexic BMI CalculatorThis anorexic BMI calculator shows your body mass index and whether it falls in an underweight range, along with where to find support if you are worried about eating.
- Weight Watcher Points CalculatorThis unofficial Weight Watchers points calculator estimates food points from nutrition label values using publicly reported formulas; it is not affiliated with WW International.
- Calorie Deficit CalculatorThis calorie deficit calculator estimates how many calories to eat each day to reach a goal weight, either at a chosen weekly rate or by a target date, and flags plans that look too aggressive.
Pregnancy
- Pregnancy CalculatorThis pregnancy calculator estimates your due date, how many weeks pregnant you are and when key milestones fall, based on your last period, conception date, an ultrasound or an IVF transfer.
- Pregnancy Weight Gain CalculatorUse this pregnancy weight gain calculator to see how much weight gain is recommended by your current week, based on your pre-pregnancy BMI and the Institute of Medicine guidelines.
- Pregnancy Conception CalculatorThis pregnancy conception calculator works backward from your due date, last menstrual period or an ultrasound to estimate when conception most likely happened.
- Due Date CalculatorThis due date calculator estimates when your baby is due and how far along you are, using the first day of your last period, a known conception date, an ultrasound or an IVF transfer date.
- Ovulation CalculatorUse this ovulation calculator to estimate when you are most likely to ovulate and which days give the best chance of conceiving, based on the start of your last period and your usual cycle length.
- Conception CalculatorThis conception calculator uses the first day of your last period and your usual cycle length to estimate when you ovulate and which days give the best chance of conceiving.
- Period CalculatorThis period calculator predicts when your next periods are likely to start and end, along with your probable ovulation days and fertile windows, from your last period and average cycle length.
Other
- Macro CalculatorThis macro calculator turns your daily calorie target into grams of protein, carbohydrate and fat, so you can plan meals around a balanced, low-fat, low-carb or high-protein split.
- Carbohydrate CalculatorThis carbohydrate calculator estimates your daily calorie needs and converts them into a range of carb grams per day for maintaining, losing or gaining weight.
- Protein CalculatorThis protein calculator estimates how many grams of protein you need each day, based on your body size, sex, age and activity level, and compares several official and sports nutrition guidelines.
- Fat Intake CalculatorThis fat intake calculator estimates your daily calorie needs and converts the recommended 20% to 35% share from fat into grams, along with a limit for saturated fat.
- TDEE CalculatorThis TDEE calculator estimates your total daily energy expenditure, the number of calories your body burns in a typical day once your activity level is taken into account.
- GFR CalculatorThis GFR calculator estimates how well your kidneys filter blood from a serum creatinine test result, age and sex, and shows the matching chronic kidney disease (CKD) stage. A separate tool covers children.
- Body Type CalculatorThis body type calculator classifies your body shape from four tape measurements, using criteria developed for clothing fit, and works out your waist-to-hip ratio as a simple health indicator.
- Body Surface Area CalculatorThis body surface area calculator estimates the total surface area of the human body from height and weight, using nine published BSA formulas side by side.
- BAC CalculatorThis BAC calculator gives a rough estimate of your blood alcohol concentration using the Widmark formula, based on what you drank, your body weight, your sex and how long ago you started drinking.
- Water Intake CalculatorThis water intake calculator gives a rule-of-thumb estimate of how much fluid to drink in a day based on your weight, how long you exercise and how hot your climate is.