Health & Fitness Calculators
Explore health & fitness calculators designed for transparent, user-editable estimates.
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Health & Fitness Calculators
- Heart Rate Zone CalculatorEstimate training heart-rate zones from age and resting heart rate using the Karvonen heart-rate-reserve method.
- Macro CalculatorSplit a daily calorie target into protein, carbohydrate and fat grams using editable percentage targets.
- How Much Water Should I Drink on Creatine CalculatorEstimate a general daily fluid target from body weight, exercise duration, climate adjustment and creatine use assumptions.
- Body Surface Area CalculatorEstimate body surface area from height and weight using the Mosteller formula.
- Wilks CalculatorCalculate a Wilks score from body weight, total lifted weight and sex using the classic Wilks coefficient formula.
- VO2 Max CalculatorEstimate VO2 max using the Cooper 12-minute run formula from distance covered in meters.
- Protein CalculatorEstimate a daily protein intake range from body weight, activity level and goal using editable grams-per-kilogram assumptions.
- Calorie Deficit CalculatorEstimate a daily calorie target and theoretical weekly weight change from maintenance calories and an editable calorie deficit.
- Water Intake CalculatorEstimate a daily water-intake range from body weight using editable milliliters-per-kilogram assumptions.
- Losertown CalculatorProject weekly body-weight change from current weight, calorie intake, age, height, sex and activity using a dynamic energy-balance estimate.
Related Guides
- How Losertown-Style Weight Projections Work: TDEE, Deficit, and Timeline
Understand how Losertown-style weight loss projections calculate your expected weight over time from daily calorie deficit, TDEE, and adaptive metabolism adjustments.
- How to Calculate Your Water Intake on Creatine
Learn how creatine affects hydration, how much extra water to drink when supplementing, and how to calculate your daily fluid needs during loading and maintenance phases.
- VO2 Max Calculator: What It Is, How to Estimate It & Why It Predicts Longevity
Estimate VO2 max from your running performance or heart rate. Understand why VO2 max is the strongest single predictor of longevity and how to improve it.
- One Rep Max Calculator: How to Estimate Your 1RM Safely
Calculate your one-rep max (1RM) for squat, bench, deadlift, and other lifts using submaximal rep formulas. Covers Epley, Brzycki, and other prediction equations with accuracy notes.
- How to Use the Wilks Calculator: Powerlifting Score Formula Explained
Understand how the Wilks score allows fair comparison of powerlifters across weight classes. Covers the Wilks formula, coefficients, and how it compares to IPF GL Points.
- Body Surface Area Calculator: BSA Formula and Clinical Applications
Calculate Body Surface Area (BSA) using the Mosteller, DuBois, and Haycock formulas. Covers why BSA is used for chemotherapy dosing, burn estimation, and pediatric medicine.
- Macro Calculator: How to Calculate Your Daily Protein, Carbs & Fats
Calculate your ideal macronutrient targets — protein, carbohydrates, and fat — based on your body weight, goals, and activity level. Backed by sports nutrition research.
- Calorie Deficit Calculator: How to Create a Safe Deficit for Fat Loss
Calculate your ideal calorie deficit for sustainable fat loss. Covers how to find TDEE, why a 500 kcal/day deficit targets 1 lb/week, and how to avoid muscle loss.