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Health & Fitness Calculators

BMI, calories, body fat, and more. 30 free calculators — no sign-up required.

Aldosterone-Renin Ratio Calculator

Calculate the aldosterone-to-renin ratio (ARR) from plasma aldosterone and PRA or direct renin concentration. Supports ng/dL, pmol/L, ng/mL/h, and mU/L with interpretation against published cutoffs.

Push-ups to Bench Press Calculator

Estimate your bench press 1RM from push-up reps using biomechanics-corrected load percentages. Includes push-up type corrections, four 1RM formulas, reverse conversion, and strength standards.

Calculate adult body mass index (BMI) from metric or US units, view a visible BMI gauge, BMI category, healthy weight range, BMI Prime, and target weight.

Calorie Calculator

Estimate your daily calorie needs based on height, weight, age, sex, and activity level using the Mifflin-St Jeor equation, with targets for weight loss, maintenance, and gain.

Absolute Neutrophil Count (ANC) Calculator

Calculate absolute neutrophil count from WBC and differential. Identify neutropenia severity for clinical and patient use.

Albon Dosage for Cats Calculator

Calculate Albon (sulfadimethoxine) dosage for cats based on weight for coccidiosis and other susceptible infections. Educational veterinary reference.

Azithromycin Pediatric Dose Calculator

Calculate weight-based azithromycin dose for children for ear infections, pneumonia, strep throat, and other indications. Educational reference.

Botox to Dysport Conversion Calculator

Convert Botox units to Dysport units and vice versa using standard conversion ratios. Educational reference for patients and practitioners.

Calculadora Para Saber Si Es Niño o Niña

Calculadora educativa para estimar el sexo del bebé basándose en métodos populares como tabla china, frecuencia cardíaca y síntomas del embarazo. Solo para diversión.

Convert Eye Prescription to 20/20 Scale Calculator

Convert eye prescription (sphere, cylinder, axis) to approximate 20/20 Snellen equivalent visual acuity. Understand what your glasses prescription means.

Dementia Life Expectancy Calculator

Estimate life expectancy after dementia diagnosis based on type, age at diagnosis, severity stage, and other factors. Educational reference tool.

Infant Tylenol Dosage Calculator

Calculate safe acetaminophen (Tylenol) dose for infants and children based on weight. Includes concentration selection and dosing interval guidance.

Odds of Having Twins Calculator

Estimate personal probability of having twins based on age, family history, fertility treatments, BMI, and other factors.

Prednisolone Pediatric Dose Calculator

Calculate weight-based prednisolone dose for children for croup, asthma, and other common indications. Educational reference for caregivers.

BMI Calculator for BBL

Estimate adult BMI before a BBL consultation, compare it with a planning target, and understand the limits of BMI for cosmetic surgery decisions.

Caffeine Half Life Calculator

Estimate caffeine remaining in the body from dose, time, and half-life using an exponential clearance formula.

Water Fasting Weight Loss Calculator

Estimate possible scale change during a water fast from calorie deficit and optional early water weight change, with safety-focused explanations.

How Much Water Should I Drink on Creatine Calculator

Estimate a practical daily water target while taking creatine using weight, exercise time, climate, and creatine phase.

Jack Daniels Running Calculator

Estimate a VDOT-style running fitness value from race distance and time, then predict an equivalent time for another distance.

Alpe du Zwift Calculator

Estimate Alpe du Zwift climb time from rider weight, bike weight, average power, route distance, elevation gain, and drivetrain efficiency.

Breast Implant Size Calculator

Estimate a rough breast implant cc range from desired cup-size change or direct target volume, with safety-focused limitations.

Breast Implant Weight Calculator

Estimate the weight of one or two breast implants from cc volume and fill density, with grams, ounces, and pounds.

Goldman Risk Index Calculator

Calculate the educational Original Goldman Cardiac Risk Index score for noncardiac surgery and view the historical risk class.

6 Minute Walk Test Calculator

Calculate 6-minute walk distance, percent predicted, walking speed, and reference comparison using common adult equations.

Chocolate Toxicity in Dogs Calculator

Estimate chocolate toxicity risk in dogs using dog weight, chocolate amount, chocolate type, and methylxanthine dose per kilogram.

Dog Due Date Calculator

Estimate a dog pregnancy due date, likely whelping window, ultrasound timing, and preparation date from breeding or ovulation date.

Dog Heat Cycle Calculator

Estimate the next dog heat cycle, visible heat window, likely fertile window, and watch period from the last heat date.

Chicken Coop Size Calculator

Estimate chicken coop floor area, outdoor run space, nest boxes, and roost length from flock size and bird type.

Cow Gestation Period Calculator

Estimate cattle calving date, calving window, dry date, and final check date from breeding or AI date.

Goat Gestation Period Calculator

Estimate goat kidding date, kidding window, last-third date, and final preparation date from breeding date.