Health & Fitness

Free A1C calculator to convert between HbA1c percentage and estimated average glucose (eAG). Supports bidirectional conversion, IFCC mmol/mol, mg/dL and mmol/L units, and ADA risk classification.

Free ABI Calculator to compute the Ankle-Brachial Index for both legs. Detect peripheral artery disease (PAD) risk with clinical six-tier interpretation and visual severity gauge.

Free ACFT and AFT score calculator. Calculate your Army Combat Fitness Test score for all 6 events with gender and age-group adjusted scoring, performance tiers, and training tips.

Free ACR calculator for albumin-to-creatinine ratio. Get KDIGO albuminuria classification (A1/A2/A3), CKD risk matrix, nephrotic range flag, and clinical interpretation.

Free Army Fitness Test (AFT) calculator with 2025 scoring tables. Calculate your score for all 5 AFT events (MDL, HRP, SDC, PLK, 2MR) with age and gender-normed results, pass/fail status, and performance tier.

Free age calculator to instantly calculate your age in years, months, days, hours, and more. Find out when your next birthday is!

Free AHI calculator for sleep apnea. Calculate your Apnea-Hypopnea Index, severity classification, and treatment recommendations based on AASM guidelines.

Free ANC calculator for absolute neutrophil count. Get NCI CTCAE grading, neutropenia severity classification, febrile neutropenia alerts, and clinical guidance for oncology patients.

Free Army Physical Fitness Test (APFT) score calculator. Get instant push-up, sit-up, and 2-mile run scores by age group and gender with pass/fail results.

Free baby due date calculator with multiple formulas (Naegele's Rule, Mittendorf-Williams, Parikh's Formula), IVF support, trimester breakdown, zodiac signs, birthstones, prenatal screening schedule, and pregnancy progress charts.

Free baby growth percentile calculator using WHO and CDC standards. Calculate weight, length, and head circumference percentiles for infants and toddlers 0–36 months.

Free blood alcohol content (BAC) calculator using the Widmark formula. Estimate your BAC based on drinks consumed, body weight, gender, and time elapsed.

Free Body Adiposity Index (BAI) calculator. Estimate body fat percentage using only hip circumference and height — no scale required.

Free BBT calculator and fertility charting tool. Track basal body temperature, detect ovulation, calculate coverline, and identify your fertile window.

Free Biologically Effective Dose (BED) calculator. Compute BED and EQD2 using the Linear-Quadratic model with tissue-specific alpha/beta ratios, protracted delivery correction, boost dose modules, and multi-schema fractionation comparison.

Free BEE calculator using Harris-Benedict, Mifflin-St Jeor, Katch-McArdle, and Schofield equations. Includes clinical stress factors for TPN and tube-feeding calculations.

Check your blood pressure category using AHA/ACC 2017 guidelines. Get your BP classification, MAP, pulse pressure, risk level, and personalized health recommendations.

Predict your child's possible blood types based on both parents' ABO and Rh factor genetics. Includes probability percentages, Punnett square, compatibility chart, and reverse lookup.

Calculate your Body Mass Index and check if you're in a healthy weight range

Free BMR (Basal Metabolic Rate) calculator to estimate the number of calories your body burns at rest. Uses both Mifflin-St Jeor and Harris-Benedict formulas with activity level adjustment for TDEE.

Free body fat calculator using the US Navy method and BMI-based estimation. Calculate your body fat percentage, fat mass, lean mass, and body fat category.

Free body type calculator using quiz, measurements, and Heath-Carter somatotype method. Discover if you are an ectomorph, mesomorph, or endomorph with personalized training and nutrition recommendations.

Free BRI Calculator using the Thomas et al. formula. Calculate your Body Roundness Index, health risk tier, waist-to-height ratio, body eccentricity, BMI, and population percentile instantly.

Free body surface area calculator using all 8 clinical formulas (Mosteller, Du Bois, Haycock, Gehan-George, Boyd, Fujimoto, Takahira, Schlich). Includes medication dose calculator, cardiac index module, and burn fluid resuscitation.

Free calorie calculator to estimate your daily calorie needs for weight loss, maintenance, or weight gain based on your age, gender, height, weight, and activity level.

Free calorie deficit calculator. Calculate your BMR, TDEE, daily calorie target, macros, and weight loss timeline. Supports Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas.

Free calories burned running calculator using MET-based formulas from the Compendium of Physical Activities. Calculate total calories, fat burned, pace-based rates, and weekly projections.

Free walking calorie calculator. Enter your weight, walking speed, duration, distance, or steps and get instant calorie burn results including fat loss, distance, step count, and weekly projections.

Free carbohydrate calculator that uses your age, sex, height, weight, activity level, and goal to calculate your optimal daily carb intake in grams using the Mifflin-St Jeor formula.

Free Charlson Comorbidity Index calculator. Assess comorbidity burden and estimate 10-year survival using the validated CCI scoring system from Charlson et al. 1987.

Free Continuing Care Retirement Community (CCRC) cost calculator. Compare CCRC contract types, entrance fees, and lifetime costs against aging in place and assisted living alternatives.

Free child height predictor using Mid-Parental Height, Khamis-Roche, and Multiplier methods. Predict your child's adult height with confidence ranges and percentile rankings.

Free conception date calculator using LMP, due date, ultrasound, birth date, or IVF transfer method. Calculate your conception date, fertile window, implantation window, trimester dates, and clinical milestones.

Free corrected reticulocyte count (CRC) calculator. Calculate CRC, RPI, and absolute reticulocyte count with clinical interpretation for anemia assessment.

Convert your dog's age to human years using modern veterinary science. Size-based formulas for Small, Medium, Large, and Giant breeds with life stage identification and health tips.

Free dosage calculator for weight-based dosing, nursing D/H/Q method, pediatric rules (Clark's, Young's, Fried's, BSA), and IV drip rate. Supports mg, mcg, g units with liquid volume and tablet count outputs.

Free Dietary Reference Intakes (DRI) calculator. Get personalized RDA, AI, UL, and EAR values for all vitamins, minerals, and macronutrients based on your age, sex, and life stage.

Free Estimated Energy Requirement (EER) calculator using official IOM/DRI equations. Calculate daily calorie needs for all life stages — infants, children, adolescents, adults, pregnancy, and lactation.

Free Fat-Free Mass Index (FFMI) calculator. Calculate your FFMI, adjusted FFMI, and see how your muscle mass compares to natural and competitive bodybuilding standards.

Free Glasgow Coma Scale (GCS) calculator with Adult and Pediatric modes, GCS-P pupil scoring, NT (Not Testable) support, standard clinical notation, and visual score breakdown.

Free eGFR calculator using CKD-EPI 2021, MDRD, and Cockcroft-Gault formulas. Calculate your estimated glomerular filtration rate and CKD stage with side-by-side formula comparison.

Free GIR Calculator for computing Glucose Infusion Rate (mg/kg/min) from dextrose concentration, infusion rate, and patient weight. Supports multiple infusion lines, reverse calculation, and clinical target ranges.

Free glycemic index and glycemic load calculator with a database of 100+ foods. Lookup GI values, calculate GL per serving, and track your meal's total glycemic load.

Free pediatric growth chart calculator using WHO 2006 and CDC 2000 LMS data tables. Plot weight, height, head circumference, and BMI percentiles for children ages 0–20 years. Includes mid-parental height predictor, preterm age correction, and Z-score outputs.

Free hCG doubling time calculator and beta hCG level lookup. Calculate pregnancy hormone doubling time, percentage change, 48-hour projection, and compare your hCG level to normal ranges by gestational week.

Free heart rate calculator to find your maximum heart rate, target heart rate zones, and heart rate reserve using multiple scientifically-validated formulas.

Free online HSI Calculator to assess your nicotine dependence level using the validated 2-question Heaviness of Smoking Index. Get personalized cessation recommendations.

Free Intracerebral Hemorrhage (ICH) Score calculator. Predict 30-day mortality risk using the validated Hemphill ICH grading scale with built-in GCS and ABC/2 volume helpers.

Free ideal weight calculator using Devine, Robinson, Miller, Hamwi, Peterson, and Lorentz formulas. Find your ideal body weight based on height, gender, and frame size with BMI-based healthy weight ranges.

Free INR calculator. Convert prothrombin time (PT) to INR using the standard formula. Includes interpretation, warfarin dose guidance, therapeutic range comparison, and INR trend tracker.

Free Injury Severity Score (ISS) calculator. Calculate ISS, NISS, and TRISS probability of survival from AIS body region scores for trauma assessment.

Free Korean age calculator. Find your Korean age (세는 나이), international age (만나이), and year age (연나이) instantly. Includes zodiac animals, countdown timers, and 2023 legal reform context.

Free LDL cholesterol calculator using Friedewald, Martin-Hopkins, and Sampson equations. Calculate LDL-C from total cholesterol, HDL, and triglycerides with risk classification.

Free life expectancy calculator using CDC actuarial data and 10 lifestyle factors. Get your estimated lifespan, biological age, healthy years, and personalized risk factor breakdown.

Free macronutrient calculator to determine your ideal daily intake of protein, carbs, and fat. Uses Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas with 6+ diet presets.

Free max heart rate calculator with training zones, Karvonen method, and multi-formula comparison. Calculate your target heart rate zones for fat loss, endurance, and performance.

Free MCA-PSV calculator for fetal anemia assessment. Calculate MoM value from gestational age and MCA Doppler measurement using the Mari et al. formula.

Free MME calculator using CDC 2022 conversion factors. Calculate total daily morphine milligram equivalents for single or multiple opioids, assess overdose risk level, and convert between opioids.

Free NLR calculator. Compute your Neutrophil-to-Lymphocyte Ratio from CBC values, get risk classification, disease context, and related immune-inflammation indices (PLR, SII, LMR).

Free Number Needed to Treat (NNT) calculator. Compute NNT, NNH, ARR, RRR, relative risk, and odds ratio from clinical trial data with confidence intervals, sensitivity analysis, and visual charts.

Free one rep max calculator with all 7 formulas (Epley, Brzycki, Lander, Lombardi, Mayhew, O'Conner, Wathen). Get your 1RM estimate, training load table, warm-up sets, plate loading, and strength standards.

Free running pace calculator with three solve modes: calculate pace, time, or distance. Includes race presets, split tables with even/negative/positive strategy, Riegel race predictor, pace zones, training zones, pace bands, and calorie estimator.

Free pregnancy due date calculator using 4 methods: Last Menstrual Period (LMP), Conception Date, Ultrasound, and IVF Transfer Date. See your estimated due date, gestational age, trimester progress, baby size comparison, milestones timeline, and more.

Free protein intake calculator. Get your personalized daily protein recommendation based on your weight, activity level, fitness goal, and body composition. Includes per-meal breakdown, caloric context, protein tiers, and food sources.

Free Pneumonia Severity Index (PSI/PORT Score) calculator. Calculate your PSI risk class, 30-day mortality rate, and get evidence-based disposition recommendations for community-acquired pneumonia.

Free online PVR calculator for pulmonary vascular resistance. Calculate PVR in Wood units and dynes·sec/cm⁵, PVRI, transpulmonary gradient, and clinical severity with reference ranges.

Free QTc calculator using all 5 correction formulas: Bazett, Fridericia, Framingham, Hodges, and Rautaharju. Includes gender-specific thresholds, drug-induced QT prolongation risk information, and clinical interpretation.

Free RMR calculator using Mifflin-St Jeor, Cunningham, and Harris-Benedict formulas. Calculate your resting metabolic rate, TDEE, and daily calorie needs.

Free sleep calculator to find the best bedtime or wake-up time based on sleep cycles. Get personalized recommendations for optimal rest using scientifically-backed 90-minute sleep cycle intervals.

Calculate the true financial cost of smoking. See daily, weekly, monthly, and yearly costs, future projections with inflation, investment opportunity cost, and health benefits of quitting.

Free steps to miles calculator. Convert steps to miles and kilometers instantly with calorie burn, walking time, stride length, and 10,000-step goal progress.

Free TDEE (Total Daily Energy Expenditure) calculator. Estimate your daily calorie burn using 4 BMR formulas, 7 activity levels, macronutrient breakdowns, zigzag calorie cycling, and weight loss/gain targets.

Free tPA (Alteplase) and Tenecteplase stroke dosing calculator. Calculate total dose, IV bolus, infusion rate, and waste volume for acute ischemic stroke treatment.

Free URR calculator for hemodialysis adequacy. Calculate Urea Reduction Ratio, Daugirdas spKt/V, eKt/V, UFR, and nPCR with clinical interpretation.

Free VO2 max calculator with 9 test protocols — Cooper 12-min run, Rockport 1-mile walk, 1.5-mile run, HR ratio, step test, beep test, Balke, Bruce treadmill, and 2000m rowing. Get ACSM fitness classification, percentile rank, fitness age, training zones, and race time predictions.

Free daily water intake calculator based on your weight, age, gender, activity level, and climate. Uses both TDEE-based and weight-based formulas to recommend optimal hydration.