7 Calculators, All In One Place
Everything you need to check your numbers, without digging through seven different apps.
BMI
Body Mass Index from your height and weight.
1 Rep Max
Estimate your max lift without a max-effort attempt.
Macros
Daily protein, carb and fat targets for your goal.
TDEE
Your daily calorie burn based on activity level.
Protein
Daily protein target based on your body weight and goal.
Body Fat
US Navy method, using cm or inches.
Water Intake
How much water to aim for each day.
No Account Needed
Open the app, get your number, done.
See It In Action
Clean, simple screens for each calculator.
Why Fit Calculator
Genuinely Free
Every calculator is free to use, with a small ad banner. Prefer no ads at all? A one-time £4.99 purchase removes them forever, no subscription.
No Sign-Up, No Data Collection
There's no login and nothing to fill in beyond the calculator itself. Nothing you enter is stored or sent anywhere.
Built By the Same Developer as REVIVE
Fit Calculator is made by the same UK indie developer behind REVIVE FITNESS, the AI-powered personal training app.
Want More Than Calculators?
REVIVE FITNESS builds on these same calculators with AI coaching, personalised workouts, meal plans and progress tracking, all in one app.
Explore REVIVE FITNESS →Frequently Asked Questions
Is Fit Calculator really free?
Yes. All 7 calculators are free to use with a small ad banner on the home screen. If you'd rather not see ads, there's an optional one-time £4.99 purchase to remove them for good, no subscription, no recurring charge.
Do I need to create an account?
No. There's no login, no sign-up and no profile. Just open the app and use whichever calculator you need.
What calculators does it include?
BMI, 1 Rep Max, Macros, TDEE (daily calorie needs), Protein, Body Fat (US Navy method) and Water Intake.
Is this the same as REVIVE FITNESS?
No, it's a separate, standalone app. REVIVE FITNESS is a full AI-powered personal training app with these calculators built in, plus AI coaching, workouts, meal plans and more. Fit Calculator is a lighter, free-standing app just for the calculators.
Is my data stored anywhere?
No. Fit Calculator doesn't collect or store the numbers you enter. Everything happens on your device.
Get Fit Calculator Free
7 calculators, no account, no sign-up. Download it now on the App Store.
