51 calculators
Health calculators
Body-baseline calculators — daily energy expenditure and other estimates grounded in the standard formulas.
Popular Health calculators
Health
BMI Calculator
Compute Body Mass Index from height and weight, with the standard category scale and the healthy weight range for your height.
Health
BMR Calculator
Estimate your Basal Metabolic Rate — the calories your body burns at rest — using the Mifflin–St Jeor equation.
Health
Calorie Calculator
Find how many calories you should eat per day based on your age, sex, weight, height, activity level, and weight goal.
Health
TDEE Calculator
Estimate your Total Daily Energy Expenditure from sex, age, height, weight, and activity — with maintenance, cut, and bulk targets.
Health
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy circumference method, with the standard fitness category scale.
Health
Target Heart Rate Calculator
Estimate maximum heart rate and target training zones from age. Supports percent-of-max and Karvonen heart-rate reserve methods.
Health
Pregnancy Due Date Calculator
Estimate the pregnancy due date from last menstrual period or conception date. Returns due date, gestational age, and trimester.
Health
Water Intake Calculator
Estimate a daily water intake target from body weight, activity minutes, and climate. Returns ounces, liters, and 8-oz cup equivalents.
Weight & Body Composition
8 calculatorsHealth
Body Shape Calculator
Determine your body shape (hourglass, rectangle, pear, spoon, or inverted triangle) based on your bust, waist, and hip measurements.
Health
BMI Calculator
Compute Body Mass Index from height and weight, with the standard category scale and the healthy weight range for your height.
Health
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy circumference method, with the standard fitness category scale.
Health
Ideal Weight Calculator
Estimate a healthy weight range from height and sex using the Hamwi, Devine, Robinson, and Miller formulas — and the BMI healthy range.
Health
Waist to Hip Ratio Calculator
Calculate waist-to-hip ratio (WHR) from waist and hip measurements. Returns the ratio and a screening category using common WHO thresholds.
Health
Lean Body Mass Calculator
Estimate lean body mass (and fat mass) from body weight and body fat percentage, or via the Boer, James, and Hume formulas from height and weight. Educational estimate, not a DEXA result.
Health
Height Calculator
Convert height between ft, in, ft+in, cm, and m, and estimate adult height for a child using the mid-parental height method. Educational estimate, not a medical or pediatric prediction.
Health
FFMI Calculator
Calculate Fat-Free Mass Index and height-normalized FFMI from weight, height, and body fat percentage. Returns fat-free mass, raw FFMI, normalized FFMI, and a reference category band.
Calories & Nutrition
9 calculatorsHealth
Calorie Calculator
Find how many calories you should eat per day based on your age, sex, weight, height, activity level, and weight goal.
Health
TDEE Calculator
Estimate your Total Daily Energy Expenditure from sex, age, height, weight, and activity — with maintenance, cut, and bulk targets.
Health
BMR Calculator
Estimate your Basal Metabolic Rate — the calories your body burns at rest — using the Mifflin–St Jeor equation.
Health
Macro Calculator
Split a daily calorie target into grams of protein, carbs, and fat with goal-based presets — fat loss, maintenance, or muscle gain.
Health
Calorie Deficit Calculator
Estimate the daily calorie deficit needed to reach a target weight by a target date or at a chosen weekly loss rate. Returns daily deficit and calorie target.
Health
Water Intake Calculator
Estimate a daily water intake target from body weight, activity minutes, and climate. Returns ounces, liters, and 8-oz cup equivalents.
Health
Calories Burned Calculator
Estimate calories burned by activity using MET values, body weight, and duration. Common activity presets plus a custom MET option. Educational estimate, not a medical measurement.
Health
Protein Intake Calculator
Estimate daily protein needs in grams from body weight and a goal preset (general health, fat loss, muscle gain, endurance, strength). Returns grams per day, per meal, per pound, and per kilogram.
Health
Caffeine in Coffee Calculator
Estimate daily caffeine intake from coffee based on brew type and serving size, and compare against FDA safety limits.
Cardio & Fitness Training
11 calculatorsHealth
Batting Average Calculator
Calculate baseball and softball stats: Batting Average (AVG), On-Base Percentage (OBP), Slugging Percentage (SLG), and OPS.
Health
Target Heart Rate Calculator
Estimate maximum heart rate and target training zones from age. Supports percent-of-max and Karvonen heart-rate reserve methods.
Health
Heart Rate Calculator
Find your maximum heart rate, target heart rate zones, and fat-burn vs cardio zone ranges for exercise.
Health
One Rep Max Calculator
Estimate one-rep max from lifted weight and reps using Epley, Brzycki, Lombardi, or the average of all three. Returns a training-load percentage table.
Health
Pace Calculator
Calculate running or walking pace, finish time, or distance from any two of distance, time, and pace. Includes presets for 5K, 10K, half marathon, and marathon, with mph and km/h speed conversions.
Health
VO2 Max Calculator
Estimate VO2 max using common field tests: Cooper 12-minute run, 1.5-mile run, and Rockport 1-mile walk. Reports estimated VO2 max and a fitness category. Educational estimate, not a medical or lab result.
Health
Bench Press Calculator
Estimate your bench press 1RM from any rep set and see bench-specific training percentages with bar loads, rep targets, and program-friendly intensity ranges.
Health
Dunk Calculator
Calculate if you can dunk a basketball based on height, standing reach, vertical jump, and rim height.
Health
RPE Calculator
Estimate your one-rep max (1RM) and calculate training percentages using weight, reps, and Rate of Perceived Exertion (RPE).
Health
Steps to Miles Calculator
Convert steps to miles and kilometers using a custom stride length or a height-based walking or running stride estimate. Optional time estimate at a chosen pace.
Health
Max Heart Rate Calculator
Estimate your maximum heart rate (MHR) by age using the standard 220 minus age formula and the Tanaka equation.
Medical & Pregnancy
13 calculatorsHealth
RVU Calculator
Calculate medical Relative Value Units (RVUs) and estimate Medicare reimbursement using work, practice expense, and malpractice values.
Health
A1C Calculator
Convert between A1C percentage and average blood glucose (eAG) in mg/dL or mmol/L.
Health
Period Calculator
Predict your next period, ovulation, and fertile window based on your cycle length.
Health
Creatinine Clearance Calculator
Estimate creatinine clearance (CrCl) for kidney function and drug dosing using the standard Cockcroft-Gault formula.
Health
BUN/Creatinine Ratio Calculator
Calculate the blood urea nitrogen (BUN) to serum creatinine ratio to help evaluate kidney function and hydration status.
Health
Corrected Calcium Calculator
Adjust total serum calcium for low albumin using Payne's formula to estimate true calcium status. Supports mg/dL and mmol/L units.
Health
AFT Calculator
Score all 5 events of the new Army Fitness Test. Includes Combat and Non-Combat MOS scoring logic.
Health
Blood Pressure Calculator
Classify a blood pressure reading using AHA-style adult categories: Normal, Elevated, Stage 1, Stage 2, and Hypertensive crisis.
Health
Pregnancy Due Date Calculator
Estimate the pregnancy due date from last menstrual period or conception date. Returns due date, gestational age, and trimester.
Health
Pregnancy Calculator
Estimate your pregnancy due date, current week of pregnancy, and trimester milestones from your last menstrual period (LMP) or conception date.
Health
Ovulation Calculator
Estimate ovulation date and fertile window from last menstrual period, cycle length, and luteal phase length.
Health
Sleep Calculator
Find suggested bedtimes or wake-up times using 90-minute sleep cycles. Returns options for 3, 4, 5, and 6 full cycles with an editable sleep latency.
Health
Blood Type Compatibility Chart & Donor Guide
An educational blood type compatibility chart details donor and recipient matching for red blood cells and plasma transfusions.
Other
10 calculatorsHealth
Prostate Volume Calculator
Calculate prostate volume using the ellipsoid formula from ultrasound measurements, compute tissue weight, and analyze PSA density.
Health
Ideal Body Weight Calculator
Estimate your healthy weight range using clinical formulas (Devine, Hamwi, Robinson, Miller) and WHO BMI standards.
Health
Due Date Calculator
Estimate your baby's pregnancy due date from last menstrual period, conception date, or IVF transfer details.
Health
CrCl Calculator
Estimate creatinine clearance (CrCl) for kidney function and drug dosing using the Cockcroft-Gault formula.
Health
ABG Calculator
Interpret arterial blood gas results to evaluate acid-base disorders, check for respiratory or metabolic compensation, and calculate the anion gap using electrolytes.
Health
Peptide Calculator
Calculate peptide reconstitution dosage, bacteriostatic water mixing volume, and syringe draw units for U-100 or custom syringes.
Health
Chipotle Nutrition Calculator
Build your custom Chipotle meal and calculate total calories, protein, carbs, fat, sodium, and fiber.
Health
Weight Gain Calculator
Calculate the daily calories needed to gain weight at your target weekly rate based on your BMR, TDEE, and surplus.
Health
Bra Size Calculator
Determine your recommended bra band and cup size based on your underbust and bust measurements using standard US sizing.
Health
Conception Calculator
Estimate your conception date, gestational age, and due date based on your last menstrual period (LMP) or current due date.