Science-Based Health & Fitness Calculators
Multi-formula comparison tools for body composition, nutrition, and training performance. Every calculator backed by peer-reviewed research.
Calculator Categories
Body Composition
BMI, body fat percentage, ideal weight, waist ratios, and body surface area calculators using validated measurement methods.
13 tools availableNutrition & Energy
TDEE, BMR, calorie, macronutrient, protein intake, and energy balance calculators based on peer-reviewed metabolic formulas.
16 tools availableTraining & Performance
One-rep max, running pace, heart rate zone, workout volume, and performance calculators grounded in exercise science.
17 tools availableFeatured Tools
BMI Calculator
Calculate your BMI in kg/m² with WHO bands (18.5–24.9 healthy, 25+ overweight), BMI Prime ratio, and your personalised healthy-weight target range.
Body Fat Calculator
Estimate body fat from Navy tape, Jackson-Pollock 3- and 7-site skinfold, and Deurenberg BMI-derived methods. Compare four validated formulas side by side.
TDEE Calculator
Calculate your total daily energy expenditure from Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas with 1.2–1.9 activity multipliers.
Macro Calculator — Personalised Splits
Calculate personalised protein, carb, and fat targets in grams from your TDEE estimate. Four diet presets covering cut, maintenance, and lean bulk.
One Rep Max Calculator — Epley, Brzycki & Lander
Estimate your one-rep max from Epley, Brzycki, and Lander formulas with a 50–100% of 1RM percentage table for working-set programming.
Workout Volume Calculator
Weekly training volume per muscle group classified against MEV, MAV, and MRV landmarks from the Renaissance Periodization framework. Free tool.
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Built by an Athlete-Technologist
PeakCalcs is built by Dan Dadovic, a PhD candidate in IT Sciences and former competitive athlete who represented Croatia in international whitewater sport. Every calculator implements a formula drawn from peer-reviewed research — AJCN, ACSM, and IOM publications — verified against known-value tests before going live.