Fitness & Health Calculators
BMI, calories, nutrition, fitness, pregnancy, and wellness calculators.
Fitness
BMI, calorie deficit, one-rep max, water intake, and body metrics calculators.
Army Body Fat Calculator
Enter sex, age, body weight, and abdomen circumference at the navel to estimate the current Army one-site tape result and compare it with the age-based standard.
BMI Calculator
Enter your height, weight, age, and sex to see your BMI score, WHO category, and an estimated body fat percentage (Deurenberg formula). The result panel shows a color-coded BMI spectrum and a visual body shape reference that updates by category. Review the limitations and population-specific thresholds before acting on any result.
BMR Calculator
Enter your age, sex, weight, height, and formula choice to see your Basal Metabolic Rate in kcal/day plus estimated TDEE at two activity levels. Adjust any input to understand how each factor shifts your resting calorie burn — the foundation of every daily calorie target.
Body Fat Calculator
Enter height, neck, waist, and when needed hip circumference to estimate body-fat percentage with the circumference formula used by this calculator. Treat the result as a tape-measure estimate, not a clinical measurement.
Bra Size Calculator
Calculate bra size (band + cup) from Band measurement, Bust measurement, with the key formulas and caveats needed to interpret the result correctly.
Calorie Calculator
Enter your age, sex, height, weight, and activity level to see your BMR, total daily calorie needs (TDEE), and targets for weight loss and gain. Adjust your activity level to explore what changes when your routine does — before you commit to a calorie plan.
Calorie Deficit Planner
Enter your maintenance calories, target weight change, and timeline to get a daily calorie target. See whether your plan falls within the safe deficit range and how adjusting the timeline changes daily intake. Balance speed with sustainability — aggressive deficits cost lean mass and trigger stronger metabolic adaptation.
Calories Burned Calculator
Enter body weight, activity, and duration to estimate total calories burned and the average burn rate for the selected exercise.
Healthy Weight Calculator
Estimate the adult BMI-based weight range for your height and use it as a screening reference, not a complete health assessment.
Height Calculator
Convert height units and review a rough mid-parental child-height estimate, with a clear reminder that growth estimates are not medical predictions.
Ideal Weight Calculator
Enter height, sex, and frame setting to compare Devine, Robinson, and Miller ideal-body-weight formulas. Read the result as a reference range, not as a personal diagnosis or health target.
Lean Body Mass Calculator
Estimate lean body mass and fat mass from total body weight and body-fat percentage, then use the result as a body-composition reference.
One Rep Max Calculator
Enter the weight you lifted and the number of repetitions to estimate your one-rep max and a practical 80% training load.
Pace Calculator
Enter distance and elapsed time to find your pace per kilometer or mile and compare race-time projections that assume the same pace continues.
Sleep Calculator
Choose your wake-up time and a number of sleep cycles to estimate a practical bedtime with a small fall-asleep buffer.
Target Heart Rate Calculator
Estimate a training heart-rate zone from age, resting heart rate, and chosen intensity using both simple max-HR percentages and the Karvonen method.
Water Intake Calculator
Enter your body weight, daily active minutes, and climate to get a personalized hydration estimate in liters per day. Adjust any input to see how a hot day or a longer workout shifts your water needs — before you set a daily hydration goal.
Pregnancy
Due date, conception, ovulation, and pregnancy planning calculators.
Conception Calculator
Use due date, last menstrual period, or ultrasound dating to estimate a likely conception date and the surrounding fertile window.
Due Date Calculator
Estimate an expected due date from the dating source you know, then review the pregnancy length and the assumptions behind the date.
Ovulation Calculator
Estimate the likely ovulation date and fertile window from your last period and average cycle length, while keeping the limits of calendar prediction visible.
Period Calculator
Enter the first day of your last period, average cycle length, and usual period duration to estimate your next period and preview the following two starts.
Pregnancy Calculator
Estimate current pregnancy timing from the dating source you know best, then review due date, trimester, and milestone dates in one place.
Pregnancy Weight Gain Calculator
Enter pre-pregnancy weight, height, current weight, pregnancy week, and pregnancy type to compare your current gain with BMI-based guidance.
Nutrition & Diet
Macro, calorie, protein, carbohydrate, TDEE, and body composition calculators.
Blood Alcohol Level Safety Check
Use this only for harm-reduction education. Enter standard drinks, body weight, sex, and elapsed time to see an estimated BAC and a clear reminder not to drive after drinking.
Body Surface Area Calculator
Estimate body surface area from height and weight, compare Mosteller and Du Bois results, and keep the value in the correct clinical context.
Body Type Calculator
Calculate body type classification from Height, Weight, Wrist and ankle measurements, with the key formulas and caveats needed to interpret the result correctly.
Carbohydrate Calculator
Choose a calorie target and diet style to estimate a daily carbohydrate range in grams, then compare it with your protein and fat targets.
Fat Intake Calculator
Enter daily calories and a diet style to estimate total fat grams plus the saturated-fat ceiling implied by your calorie target.
GFR Calculator
Estimate eGFR from creatinine, age, and sex with the 2021 CKD-EPI equation, then read the result as a screening estimate rather than a diagnosis.
Macro Calculator
Choose a calorie target and macro split to convert protein, carbohydrate, and fat percentages into grams. Use the result as a meal-planning framework, not as a personalized nutrition prescription.
Protein Calculator
Enter body weight, activity level, and goal to see your daily protein target in grams. Compare the DRI minimum against evidence-based sports nutrition ranges — and understand why protein needs differ so dramatically by goal and training status.
TDEE Calculator
Enter your age, sex, weight, height, and activity level to see your Total Daily Energy Expenditure — the calories you actually burn each day. Compare activity levels side by side to see exactly how much your daily routine shifts your calorie budget before you build a plan around it.
