Health calculators
Free professional health calculators with verified formulas and step-by-step solutions.
Walking Calorie Calculator
Estimate calories burned walking using the MET method (Compendium of Physical Activities). Inputs: weight, duration, pace, incline. Outputs:…
OpenSteps to Miles Calculator
Convert steps to miles and kilometers using your height (stride length = height × 0.413). Defaults to 2.5 ft male / 2.2 ft female if no heig…
OpenmL to Grams Converter
Convert milliliters to grams using real ingredient densities. Water is the only 1:1 conversion - flour is 0.53 g/mL, honey is 1.42 g/mL. Bid…
OpenGrams to Cups Converter
Convert grams to US cups using real ingredient densities. 125 g of all-purpose flour = 1 cup. 200 g of granulated sugar = 1 cup. 227 g of bu…
OpenCalorie Deficit Calculator
Calculate how many calories to eat for weight loss. Uses the Mifflin-St Jeor equation for BMR (more accurate than Harris-Benedict), an activ…
OpenHeight Converter
Switch height between feet/inches, centimeters and meters using exact 2.54 cm-per-inch conversion. Includes a comparison panel against US an…
OpenSteps to Calories Calculator
Estimate calories burned from a step count using body weight and pace. Uses MET values from the 2011 Compendium of Physical Activities for s…
OpenGrams to Tablespoons Converter
Grams to tablespoons converter that handles ingredient density. Flour, sugar, butter, honey, oil, salt and more - each with its own gram-per…
OpenMcg to IU Converter (Vitamins A, D, E)
Micrograms to International Units converter. Each vitamin has its own factor: Vitamin D 1 mcg = 40 IU, Vitamin A 1 mcg RAE = 3.33 IU, Vitami…
OpenGrams to Teaspoons Converter
Grams to teaspoons converter that handles ingredient density. Sugar, salt, flour, baking powder, spices, and more - each with its own gram-p…
OpenBody Fat Calculator (US Navy Method)
US Navy body fat calculator using the Hodgdon-Beckett tape method. Enter height, neck, waist (plus hip for women) and get your body fat perc…
OpenCups to Pounds Converter
Convert US cups to pounds using real ingredient densities. 1 cup of flour = 0.28 lb, 1 cup of butter = 0.5 lb, 1 cup of honey = 0.75 lb. Thi…
OpenWaist-to-Hip Ratio Calculator
Compute your waist-to-hip ratio (WHR) and see WHO health-risk category. Toggle between cm and inches. Separate thresholds for men and women.
OpenVO2 Max Calculator
Estimate VO2 max with two field tests - Cooper 12-minute run or Rockport 1-mile walk - and read the fitness category from Cooper Institute a…
OpenWinning Percentage Calculator
Calculate winning percentage from a team record. Standard mode handles NBA, NFL, MLB, and college standings (ties count as ½ win per NCAA ru…
OpenPounds to Cups Converter
Convert pounds (lb) to US cups for 13 common kitchen ingredients. 1 lb of all-purpose flour fills 3.63 cups, 1 lb of granulated sugar fills …
OpenBench Press Calculator (1RM)
Estimate your bench press one-rep max (1RM) without testing a true max. Returns Epley and Brzycki estimates side-by-side, an average, body-w…
OpenBMR Harris-Benedict Equation Calculator
Compute basal metabolic rate with the revised Harris-Benedict equation (Roza & Shizgal 1984). The widget shows BMR, TDEE for five activity m…
OpenPeptide Dosage Calculator
Convert peptide vial mass, reconstitution volume, and target dose into insulin-syringe units. Defaults: 10 mg / 2 mL / 250 mcg = 5 units on …
OpenMaintenance Calorie Calculator
Estimate your maintenance calories (TDEE) using the Mifflin-St Jeor equation. Pick activity level and macro split - protein, carbs and fat i…
OpenMean Arterial Pressure Calculator
Mean arterial pressure (MAP) is the average pressure perfusing organs during the cardiac cycle. Enter systolic and diastolic blood pressure …
Openmmol/L to mg/dL Converter
Convert lab values between mmol/L (SI) and mg/dL (US) units. Factors per analyte: glucose ×18, cholesterol ×38.67, triglycerides…
OpenRunning Calorie Calculator
Estimate running calories burned using the MET method. Six pace presets from easy jog (6.0 MET) to race pace (12.8 MET). Inputs: weight, dur…
OpenCalories Burned Biking Calculator
Estimate calories burned biking using your weight, duration, and intensity level. Built on the standard MET method published by Ainsworth et…
OpenSwimming Calorie Calculator
Estimate calories burned swimming using stroke type, intensity, weight, and duration. Built on MET values published in the Compendium of Phy…
OpenJump Rope Calorie Calculator
Estimate kcal burned in a jump-rope session. Pick body weight, minutes, and intensity (slow, moderate, fast, double-unders). MET values: 8.8…
OpenWeight Gain Calculator
Find your daily calorie target for gaining weight. Inputs: age, sex, height, weight, activity, weekly gain pace. Uses Mifflin-St Jeor BMR an…
OpenCalories Burned Calculator
How many calories did you burn? Enter weight, duration and activity to get kcal using MET values from the Ainsworth Compendium. Covers cardi…
OpenCalories Burned Weight Lifting Calculator
Estimate calories burned during a weight-lifting session using MET-based formulas from the Ainsworth Compendium. Light, moderate, and vigoro…
OpenIQ Percentile Calculator
Enter an IQ score (or a percentile) and see where it sits on the Wechsler scale. Calculator returns the percentile, z-score, classification …
OpenBody Shape Calculator
Find your body shape from bust, waist, and hip measurements. Five categories (apple, pear, hourglass, rectangle, inverted triangle) plus wai…
OpenWaist-to-Height Ratio Calculator
Compute your waist-to-height ratio (WHtR) and read it against the NICE 2022 categories. The simple rule: keep waist under half your height. …
OpenBatting Average Calculator
BA = Hits divided by At-Bats. Shown in baseball convention (.300, .406). Optional MLB season pace projection. Includes Mendoza-Line context.
OpenWeight Loss Percentage Calculator
Convert starting and current weight into a percent of body weight lost. lb or kg, optional goal-weight progress, NIH-cited milestone tiers.
OpenPace Calculator
Calculate running or cycling pace from distance and time. Outputs pace per kilometer, pace per mile, and speed in km/h and mph. Includes pre…
OpenNavy Body Fat Calculator
Estimate body fat percentage with the US Navy circumference (tape) method and check it against the current Army, Navy, USAF and USMC standar…
OpenEarned Run Average (ERA) Calculator
Calculate a pitcher's earned run average (ERA) from earned runs and innings pitched. The calculator also reports ERA+ vs. the league baselin…
OpenArmy Body Fat Calculator (AR 600-9)
Calculate US Army body fat percentage using the AR 600-9 tape method. Compares the result against the Army age-bracket standards for male an…
OpenResting Metabolic Rate (RMR) Calculator
Calculate resting metabolic rate (RMR) from age, sex, height and weight using Mifflin-St Jeor. Includes TDEE for five activity multipliers a…
OpenIdeal Weight Calculator
Compute ideal body weight using the four standard clinical formulas (Robinson 1983, Miller 1983, Devine 1974, Hamwi 1964) plus the WHO healt…
OpenCalories Burned by Heart Rate
Estimate calories burned during exercise using the Keytel et al. 2005 heart-rate formula. Separate equations for men and women. Inputs: weig…
OpenLean Body Mass Calculator
Estimate lean body mass (LBM) using three validated clinical formulas: Boer (1984), James (1976), and Hume (1966). Inputs are weight, height…
OpenBike Size Calculator
Find the right bicycle frame size from your height and inseam. The calculator handles road, mountain, hybrid, and city bikes with the standa…
OpenOne Rep Max Calculator (1RM)
Estimate your one rep max (1RM) from a submaximal set. The calculator runs both Epley (1985) and Brzycki (1993), reports both estimates and …
OpenCricket Follow-On Calculator
Cricket follow-on calculator: enter the two first-innings totals and pick the match length. The tool applies MCC Law 14 - 200 runs for 5+ da…
OpenDosage Calculator
Weight-based dosage calculator: enter patient weight, prescribed mg/kg, drug concentration, and frequency. Returns dose per administration, …
OpenCalorie Calculator
Calorie calculator that estimates daily energy needs from age, sex, weight, height, and activity level. Uses Mifflin-St Jeor BMR (1990) mult…
OpenBMI Calculator for Women
BMI calculator for women using the standard WHO and CDC adult categories (18.5-24.9 = normal). Adds women-specific body-fat-percentage conte…
OpenFace Shape Calculator
Enter face length, forehead width, cheekbone width, and jaw width to classify your face into one of seven shapes used by dermatologists and …
OpenBMI Calculator for Men
BMI calculator for men using the WHO and CDC formula. Metric or imperial inputs, optional waist circumference with the male NIH thresholds (…
OpenCholesterol Ratio Calculator
Compute total cholesterol to HDL ratio plus LDL/HDL, triglyceride/HDL, and non-HDL cholesterol. Friedewald LDL estimation when LDL is blank.…
OpenBlood Type Calculator
Predicts a child’s possible blood types (A, B, AB, O and Rh+ / Rh−) from both parents using Mendelian genetics. Not a paternity test -…
OpenLDL Cholesterol Calculator
Estimate LDL cholesterol (bad cholesterol) using the Friedewald equation. The widget accepts mg/dL or mmol/L, classifies the result against …
OpenBMR Calculator (Mifflin-St Jeor)
Compute basal metabolic rate with the Mifflin-St Jeor equation (1990), the most accurate BMR formula for modern adults. The widget shows BMR…
OpenNavy PRT Calculator
Score the US Navy Physical Readiness Test (PRT) using current OPNAVINST 6110.1J standards. Enter push-ups, forearm plank, and 1.5-mile run t…
OpenFat Burning Zone Calculator
Find your fat burning heart-rate zone (60-70% of max HR), plus warm-up, cardio, and peak zones. Choose between the 220-age, Karvonen heart-r…
OpenSlugging Percentage Calculator
Slugging percentage calculator that turns singles, doubles, triples, home runs and at-bats into the official MLB SLG statistic. Also compute…
OpenStride Length Calculator
Estimate stride length from your height. The calculator uses standard biomechanical coefficients (0.415 men / 0.413 women for walking, 0.52 …
OpenDrops Per Minute Calculator
Calculate IV infusion drops per minute from volume, time, and drop factor. Supports standard macrodrip tubing (10, 15, 20 gtt/mL) and microd…
OpenOn-Base Percentage Calculator
Calculate a baseball player on-base percentage from hits, walks, hit-by-pitch, at-bats, and sacrifice flies. Includes MLB benchmarks (.320 l…
OpenSauna Calories Burned Calculator
Estimate calories burned during a sauna session using MET-based calculations. Traditional sauna sits at MET 1.5, infrared at 1.3, steam room…
OpenPrescription Refill Calculator
Estimate when you can safely refill your prescription based on pills per day, total pills in the bottle, and days since fill. Uses the stand…
OpenSteps to Kilometers Calculator
Convert steps to kilometers and miles using your height (stride = 0.413 × height in inches). Defaults to 0.76 m male / 0.67 m female if no h…
OpenElliptical Calorie Calculator
Estimate elliptical trainer calorie burn with the MET method. Three intensity presets - light (5.0 MET), moderate (5.5), vigorous (7.0). Inp…
OpenAdjusted Body Weight Calculator
Compute adjusted body weight for drug dosing in obese patients. Returns Devine ideal body weight, AjBW with a 0.4 correction factor (configu…
OpenAmoxicillin Pediatric Dosage
Calculate the per-dose milligrams and milliliters of amoxicillin suspension for a child by weight, mg/kg/day, frequency (BID or TID), and su…
OpenAST/ALT Ratio Calculator
Compute the De Ritis ratio (AST divided by ALT) and get a quick pattern reading: hepatocellular (ratio < 1), mixed (1–2), or alcoholic / …
OpenReverse Due Date Calculator
Work backwards from an estimated due date to the probable conception date, last menstrual period, fertile window, and pregnancy timeline. Us…
OpenCalories Burned Standing Calculator
Estimate calories burned while standing using the MET formula. Quiet standing is MET 1.5, standing while working MET 2.0, active standing ME…
OpenPediatric Dose Calculator
Estimate a child dose from an adult reference using one of five historical rules: Clark's (weight in lb), Young's (age 1-12), Fried's (infan…
OpenAlbumin Globulin Ratio Calculator
Calculate the albumin/globulin (A/G) ratio from albumin and total protein. Includes the globulin derivation, reference bands, and an educati…
OpenEER Calculator - Estimated Energy Requirement
Estimate daily calorie needs (EER) using the Institute of Medicine 2005 / NAM Dietary Reference Intakes equations. Separate formulas for adu…
OpenHiking Calorie Calculator
Estimate calories burned on the trail and how long the route will take. Uses MET values from the Ainsworth Compendium plus a Naismith-style …
OpenMaddrey Discriminant Function Calculator
Calculate Maddrey\'s discriminant function for alcoholic hepatitis severity. DF ≥ 32 identifies severe disease and the threshold for cortico…
OpenSki Size Calculator
Find the right ski length by entering your height, weight, skill level, and terrain preference. Uses standard REI / Salomon sizing logic and…
OpenWeight Watchers Points Calculator
Estimate Weight Watchers points per serving from calories, saturated fat, sugar, and protein. Reproduces the SmartPoints (2015) and PointsPl…
OpenNFL Passer Rating Calculator
NFL passer rating calculator using the official 1973 formula. Caps each of the four components (completion %, yards per attempt, TD rate, IN…
OpenStairs Calorie Calculator
Estimate calories burned climbing stairs from weight, duration and intensity. Uses MET values from the 2024 Compendium of Physical Activitie…
OpenSwimming Time Calculator
Estimate total swim time, lap count, and speed from distance and pace per 100 m or 100 yd. Toggle between SCY (25 yd), SCM (25 m), and LCM (…
OpenBody Surface Area Calculator
Body surface area calculator. Three validated formulas: Mosteller (1987, standard adult), DuBois (1916, classic) and Haycock (1978, pediatri…
OpenGeriatric BMI Calculator
BMI calculator tuned for older adults. Applies a geriatric healthy range of 23-27 kg/m² to reflect age-related changes in body composition, …
OpenHeart Rate Zone Calculator
Calculate the five heart rate training zones (Z1 recovery to Z5 VO2 max) from age and optional resting heart rate. Three methods supported: …
OpenTransferrin Saturation Calculator
Compute transferrin saturation from serum iron and total iron binding capacity. Outputs the saturation percentage, UIBC, estimated serum tra…
OpenNet Carbs Calculator
Net carbs calculator. Enter total carbs, fiber and sugar alcohols. The calculator subtracts fiber and the digestible portion of sugar alcoho…
OpenRunning Pace Calculator
Running pace calculator. Enter distance and elapsed time; get pace per kilometre, pace per mile, speed in km/h and mph, plus projected finis…
OpenABI Calculator - Ankle-Brachial Index
Calculate the ankle-brachial index (ABI) from four blood pressure readings to screen for peripheral artery disease. Returns left, right and …
OpenStroke Volume Calculator
Calculate stroke volume from echocardiogram EDV and ESV values (or from cardiac output and heart rate). Outputs cardiac output, ejection fra…
OpenACR Calculator - Urine Albumin-Creatinine Ratio
Calculate the urine albumin-to-creatinine ratio (ACR) in mg/g or mg/mmol. Returns the KDIGO 2024 albuminuria category (A1, A2, A3) used to s…
OpenMortality Rate Calculator
Calculate crude mortality rate, case fatality rate (CFR) or infant mortality rate (IMR). Choose the population multiplier (per 1k, 10k or 10…
OpenDrug Half-Life Calculator
Estimate how much of a drug remains in the body after a given time. Uses first-order elimination: C = C₀ × (½)^(t/t½). Educational reference…
OpenDunk Calculator - Can You Dunk a Basketball?
Find out if you can dunk a basketball. Enter your height and vertical jump - the dunk calculator returns standing reach, jump reach, and the…
OpenBUN/Creatinine Ratio Calculator
Compute the BUN/creatinine ratio from BUN and serum creatinine in mg/dL. The calculator returns the ratio plus a tier (normal 10-20, low <10…
OpenCaffeine Calculator - Daily Intake & FDA Limit
Add up daily caffeine across coffee, espresso, tea, soda, energy drinks and chocolate. The caffeine calculator returns total mg and compares…
OpenANC Calculator - Absolute Neutrophil Count
Calculate the absolute neutrophil count (ANC) from WBC and the differential. Returns cells/µL plus severity (normal ≥1500, mild 100…
OpenBody Water Calculator
Estimate total body water with the Watson formula. Inputs: age, sex, height, weight. Outputs liters of TBW, percent of body weight, and a Hu…
OpenGestational Age Calculator
Estimate gestational age in weeks and days from your last menstrual period, conception date, or first-trimester crown-rump length. Also retu…
OpenKarvonen Formula Calculator
Karvonen heart rate reserve method. Inputs: age and resting HR. Output: target heart rate for five training zones from recovery to VO2 max.
OpenHematocrit / Hemoglobin Calculator
Convert between hematocrit and hemoglobin with the rule of three (HCT ≈ 3 × HGB). Computes MCHC, flags normal ranges by sex, and…
OpenFFMI Calculator
Calculate Fat-Free Mass Index (FFMI) and normalized FFMI from your weight, height, and body-fat percentage. Compare against the Kouri 1995 n…
OpenCholesterol Units Converter
Convert cholesterol units between mg/dL (US) and mmol/L (rest of world). Supports total, HDL, LDL, and triglycerides. Each lipid has its own…
OpenBMI Calculator
Calculate your Body Mass Index from weight and height. Metric and imperial units, WHO categories, healthy weight range.
OpenNo calculators match .