Health
Health Calculators
Use transparent screening estimates with clearly stated methods and limitations.
63 tools
Body & BMI 7
Body Surface Area Calculator
Body surface area calculator: compute BSA from height and weight using Du Bois, Mosteller, and other standard formulas used in dosing. Free, no signup.
Frame Size Calculator
Frame size calculator: find your ideal bike frame size from your height and inseam for a comfortable, efficient fit. Free, private, runs in your browser.
Lean Body Mass Calculator
Lean body mass calculator estimates fat-free mass from your weight, height, gender and body fat. Free, private, runs in your browser, no signup required.
Waist Hip Ratio Calculator
Waist hip ratio calculator: compute your WHR from waist and hip measurements and see the WHO health risk band it falls in. Free, private, runs locally, no signup.
Waist to Height Ratio Calculator
Waist to height ratio calculator: divide waist circumference by height to assess central fat health risk. Instant result, no signup, private, free in browser.
BMI Calculator
bmi calculator that computes body mass index from height and weight, with healthy ranges by age for men and women. Free, private, runs locally in your browser.
Body Fat Estimate Calculator
Body fat calculator: estimate your body fat percentage from simple body measurements using the US Navy method, with lean mass. Free, private, no signup.
Fitness & Calories 17
Calorie Deficit Calculator
Calorie deficit calculator: set a goal weight and date and get your daily calorie target plus expected weekly loss. Free, private, no signup required.
Calorie Target Calculator
Calorie target calculator: get daily calories for cutting, maintaining, or bulking from your stats and activity level. Free, runs in your browser, no signup.
Cycling Calories Calculator
Cycling calories calculator estimates calories burned per ride using your weight, speed and duration. Free, private, runs locally in your browser, no signup.
Gym Cost Per Visit Calculator
Gym cost per visit calculator divides your monthly membership, sign-up fees, and annual costs by how often you actually go. Free, editable rates, no signup.
Heart Rate Recovery Calculator
heart rate recovery calculator that measures HRR from peak and one-minute recovery pulse and flags healthy ranges by age. Free, runs locally, no signup.
Heart Rate Zones Calculator
Heart rate zones calculator: turn your age or max heart rate into five training zones with target bpm ranges for every workout intensity. Free, no signup.
Macro Split Calculator
Macro split calculator: convert daily calories and your goal into protein, carb, and fat gram targets for cutting, maintaining, or bulking. Free, no signup.
Maintenance Calories Calculator
Maintenance calories calculator: compute your daily calories to maintain weight from age, height, weight, and activity level. Free, private, no signup.
Steps to Miles Calculator
Steps to miles calculator: convert your daily step count into miles or kilometers using your height and stride length. Free, private, no signup, runs locally.
Stride Length Calculator
Stride length calculator: measure your walking or running stride length from height or counted steps for accurate distance. Free, runs locally, no signup.
Swimming Calories Calculator
Swimming calories calculator: compute calories burned per session from stroke type, duration, and your body weight. Editable MET values, free, private.
VO2 Max Calculator
VO2 max calculator: estimate your aerobic fitness from a resting heart rate, run time, or walk test and see your fitness age and rating. Free, private.
VO2 Max Calculator
VO2 max calculator: estimate your maximal oxygen uptake from resting heart rate, age, and fitness level for training zones. Free, runs locally, no signup.
Walking Calories Calculator
Walking calories calculator: estimate calories burned on any walk from distance, pace, terrain, and body weight. Free, private, in-browser, no signup.
Calorie Calculator
calorie calculator that estimates daily calorie needs and macros from age, weight, and activity level using Mifflin-St Jeor. Free, runs locally, no signup.
Macro Planning Calculator
Macro calculator: turn your daily calorie target into protein, fat, and carb gram targets for meal planning. Editable ratios, free, runs in your browser.
Pace Calculator
Running pace calculator: convert race time and distance into pace per km or mile, and predict marathon or 5K finish times. Free, private, no signup required.
Nutrition & Hydration 9
Blood Sugar Converter
Blood sugar converter: switch glucose readings between mg/dL and mmol/L instantly, with a quick reference chart. Free, private, runs locally, no signup.
Caffeine Half-Life Calculator
Caffeine half-life calculator: track how much caffeine remains in your body hour by hour so you can time your last coffee and protect your sleep. Free, no signup.
Daily Water Intake Calculator
Daily water intake calculator: estimate how much water you need per day from weight, activity, and climate. Free, private, no signup, runs in your browser.
Fasting Window Calculator
Fasting window calculator: plan 16:8, 18:6, and custom intermittent fasting schedules from your last meal and wake time. Free, runs locally, no signup.
Intermittent Fasting Calculator
Intermittent fasting calculator: pick 16:8, 18:6, or OMAD and get your eating window, fasting schedule, and daily calorie target. Free, runs locally, no signup.
Protein Shake Calculator
protein shake calculator that sizes scoops, calories, and daily protein intake against your body weight and training goals. Free, private, runs in your browser.
Sodium Calculator
Sodium calculator: total sodium and salt intake from serving sizes and milligrams per serving, checked against daily limits. Free, private, runs in your browser.
Sugar in Drinks Calculator
Sugar in drinks calculator: total grams and teaspoon counts from drink volume and sugar per 100ml, across bottles or cans. Free, private, runs in your browser.
Weight Loss Timeline Calculator
Weight loss timeline calculator: project weekly weight change and goal date from current weight, deficit, and activity. Editable rates, free, runs locally.
Sleep & Recovery 4
Sleep Cycle Calculator
Sleep cycle calculator: find the best bedtime or wake time so you complete full 90-minute sleep cycles and wake up refreshed. Free, private, no signup.
Sleep Cycle Calculator
Sleep cycle calculator finds the best bedtime or wake time based on 90-minute sleep cycles so you wake up feeling rested. Free, private, runs locally, no signup.
Sleep Debt Calculator
Sleep debt calculator: compare your actual nightly sleep against your personal sleep need over a week and see hours owed plus recovery time. Free, private.
Sleep Length Calculator
Sleep length calculator: see how many hours and sleep cycles you get between your bedtime and alarm, and when to sleep to hit your goal. Free, runs locally.
Women's Health 8
Baby Formula Calculator
Baby formula calculator: estimate daily formula ounces, feeds, and scoops by your baby's weight and age. Free, private, runs in your browser, no signup.
Bra Size Calculator
Bra size calculator that converts your band and bust measurements into sister sizes across US, UK, and EU charts. Free, runs in your browser, no signup.
Conception Calculator
Conception calculator that estimates your conception date and fertile window from a due date or last period. Free, private, runs in your browser, no signup.
Menstrual Cycle Calculator
Menstrual cycle calculator predicts your next period, fertile window, and ovulation from your cycle length and last period date. Private, runs locally, no signup.
Period Cycle Calculator
Period cycle calculator: track your cycle length and predict your next period, fertile window, and ovulation day from your last period dates. Free, no signup.
Pregnancy Due Date Calculator
Pregnancy due date calculator: estimate your due date from your last period or conception date, plus current week and trimester. Free, runs in your browser.
Pregnancy Weight Gain Calculator
Pregnancy weight gain calculator: see your recommended weekly and total gain ranges by pre-pregnancy BMI and trimester, per IOM. Free, runs locally, no signup.
Pregnancy Calculator
Pregnancy calculator: find your due date, current week of pregnancy, and estimated conception date from your last period. Free, in your browser, no signup.
Blood & Heart 6
Blood Alcohol Content Calculator
Blood alcohol content calculator: estimate BAC from drinks, body weight, sex, and elapsed time using the Widmark formula. Free; do not drive after drinking.
Blood Pressure Category Calculator
Blood pressure calculator: read your systolic and diastolic numbers and see your AHA category, from normal to hypertensive crisis. Free, runs in your browser.
Cholesterol Ratio Calculator
Cholesterol ratio calculator: compute total cholesterol to HDL, LDL to HDL, and triglyceride ratios from your lab panel. Free, private, runs in your browser.
GFR Calculator
GFR calculator: estimate glomerular filtration rate from serum creatinine, age, and sex using the CKD-EPI equation. Free, private, no signup, in your browser.
Metabolic Age Calculator
Metabolic age calculator: compare your BMR to age-based averages to estimate your body's metabolic age. Free, runs locally in your browser, no signup.
Pulse Pressure Calculator
Pulse pressure calculator: subtract diastolic from systolic blood pressure and flag wide or narrow pulse ranges. Free, private, runs locally, no signup.
More health tools 12
A1c Calculator
A1c calculator: convert your average blood glucose reading into an estimated hemoglobin A1c percentage instantly. Free, runs locally in your browser, no signup.
Fetal Weight Calculator
Fetal weight calculator estimates your baby's weight from ultrasound measurements like BPD, HC, AC and FL. Free, runs locally in your browser, no signup.
Gestational Age Calculator
Gestational age calculator: compute pregnancy weeks and days from LMP or due date, with trimester dates included. Free, private, runs in your browser.
Mean Arterial Pressure Calculator
Mean arterial pressure calculator: compute MAP from systolic and diastolic readings using (SBP + 2xDBP) / 3, and check the normal range. Free, private.
Medicine Dosage Calculator
Medicine dosage calculator: convert weight-based pediatric doses into accurate mL or mg amounts, with per-day checks. Free, private, runs in your browser.
Pollen Forecast Calculator
Pollen forecast calculator: see expected tree, grass and weed pollen levels by month for your region and plan allergy meds. Free, runs in your browser.
Sensitivity Specificity Calculator
Sensitivity specificity calculator: compute sensitivity, specificity, PPV and NPV from any 2x2 confusion matrix. Free, runs in your browser, no signup.
Sunscreen SPF Calculator
Sunscreen SPF calculator: estimate time to sunburn and reapplication intervals from SPF rating, skin type, and UV index. Free, editable inputs, no signup.
UV Exposure Calculator
UV exposure calculator that estimates safe sun exposure time from the UV index and your skin type before you go outside. Free, no signup, runs in your browser.
Vitamin D Calculator
Vitamin D calculator: convert IU doses to daily or weekly amounts and estimate levels from your inputs. Free, runs locally, editable defaults, no signup.
BMR & TDEE Calculator
BMR and TDEE calculator: estimate your basal metabolic rate and daily calorie needs with the Mifflin St Jeor formula. Free, private, runs in your browser.
Ideal Weight Calculator
Ideal weight calculator by height: compare the Devine, Robinson, Hamwi, and Miller formulas side by side and see why they disagree. Free, runs in your browser.