FREE TOOLS FOR TRAINERS AND EDUCATORS
The Trainer's Toolkit
The calculators every fitness certification teaches — calories, macros, body fat, heart rate zones — each on its own page, with the formulas shown and the research cited. Free, no sign-up, ready for the projector.
Calories, BMI and Macros
Free calorie, TDEE, BMR, BMI and macro calculator with Mifflin–St Jeor or Krause, goal-based or percentage macros — every formula shown. Built for trainers and fitness educators.
Open calculatorBody Fat from Skinfolds
Free skinfold body fat calculator: enter the 3, 4 or 7 folds and see the result on a Lean / Ideal / Average / Overfat chart by age. Jackson–Pollock, Durnin–Womersley and Siri, with every formula shown.
Open calculatorBody Fat Chart (One Pinch)
Interactive one-site body fat caliper chart for men and women by age: enter the pinch in millimetres and see the body fat percentage and Lean, Ideal, Average or Overfat band.
Open calculatorHeart Rate Zones
Free heart rate zone calculator: maximum heart rate by Fox or Tanaka, heart rate reserve and five training zones by %HRmax or the Karvonen method — formulas shown.
Open calculatorFat Loss Projection
Free calorie deficit calculator: how much weight a daily deficit removes per week and per month, using the 7,700 kcal per kg rule — with its limits explained.
Open calculatorMuscle and Weight Gain Projection
Free calorie surplus calculator: how much weight a daily surplus adds per week, and the protein needed for that weight to be muscle rather than fat.
Open calculatorFor instructors and lecturers
Built for the Classroom
Put it on the projector
No login wall and nothing to install. Change one input and the whole class sees every result update.
Teach the method, not the button
Each tool shows its equations and the original research, ready to drop into a lecture slide or reading list.
Compare methods side by side
Mifflin–St Jeor vs Krause, Fox vs Tanaka, %HRmax vs Karvonen, JP3 vs JP7 — switch live and discuss why they differ.
Students can follow along
Works on any phone. Nothing is uploaded or stored on a server, so students can practise freely with made-up or their own numbers.
Questions
About These Tools
Are these calculators free to use in a class or course?
Yes. They are free, need no account, and can be shown on a projector or shared with students as a link — each tool has its own page.
Do the calculators store any data?
No numbers are sent to a server. The pages only remember a few preferences — units, method and the age entered in the caliper tool — in your own browser.
From Classroom to Clients
When your students start coaching, TrainerQ runs these same calculations on real clients — with programs, progress reports and bookings in one place. Free for coaches.