Free, Science-Based Fitness Calculators
Accurate formulas from peer-reviewed research. No registration, no ads in results, instant answers. Calculate your TDEE, BMI, macros, body fat, and more.
7 Core Calculators
Everything you need to plan your nutrition, track your body composition, and program your training — backed by science.
TDEE
Calculate your Total Daily Energy Expenditure to know how many calories you burn per day.
BMI
Calculate your Body Mass Index and see where you fall on the WHO scale.
Macros
Calculate your daily protein, carb, and fat targets based on your goals.
Calories
Quickly calculate how many calories you need per day to lose, maintain, or gain weight.
Body Fat
Estimate your body fat percentage using the U.S. Navy method or BMI-based formula.
Ideal Weight
Find your ideal weight range using four evidence-based formulas.
1RM
Estimate your one-rep max for bench press, squat, deadlift, and more.
Breakout Niche Tools
Unique tools you won't find on most fitness sites — answering the questions competitors ignore.
How It Works
Enter Your Details
Height, weight, age, and activity level — with metric and imperial support.
Get Instant Results
See results from multiple peer-reviewed formulas compared side by side.
Take Action
Use your personalized targets to plan meals, adjust training, or track progress.
Why Trust PhysiqueLogic?
Peer-Reviewed Sources
Every formula is cited from published journal articles. No guesswork.
Multi-Formula Comparison
We show results from multiple equations so you can compare and decide.
YMYL Compliant
Medical disclaimers, methodology sections, and editorial review dates on every page.
No Hidden Agenda
Free calculators, no paywall. Results first, everything else second.
Ready to Start?
Pick the calculator that matches your current goal and get science-backed targets in seconds.