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Your Free Fitness Companion

Fit by TrySlimTrack gives you fast, science-based calculators for BMI, calories, water intake and more — so you can understand your body before you decide what to do about it.

5 free calculators 0 registration required Instant results
BMI: Healthy
Goal on track
Free Tools

Everything you need to know your numbers

Five focused calculators, each built around one question — answered in seconds, backed by established health formulas.

BMI Calculator

Find your Body Mass Index and see what it means for your health in plain language.

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Water Intake Calculator

Get a personalized daily hydration target based on your weight and activity level.

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Calorie Calculator

Discover your daily calorie needs for maintaining, losing or gaining weight.

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Ideal Weight Calculator

See a healthy weight range for your height and frame, based on trusted formulas.

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Basal Metabolic Rate Calculator

Learn how many calories your body burns at rest — the foundation of any nutrition plan.

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Why Fit

Built to be useful, not to sell you something

Completely Free

Every tool, every time. No trials, no paywalls.

Fast Results

Answers appear the moment you finish typing.

Science-Based

Built on established, peer-reviewed formulas.

Mobile Friendly

Designed to work perfectly from your phone.

No Registration

No account, no email, no password to remember.

How It Works

Three steps. No learning curve.

1

Choose a Tool

Pick the calculator that matches what you want to know today.

2

Enter Your Information

A few simple fields — height, weight, age or activity level.

3

Get Instant Results

See your number instantly, explained in plain, practical terms.

From the Blog

Learn the why behind your numbers

How to Calculate BMI Correctly

The formula is simple — but a few common mistakes throw the number off.

Read More

How Much Water Should You Drink Daily?

Why "eight glasses a day" isn't the full story — and what actually matters.

Read More

Understanding Calorie Deficit

The real relationship between calories in, calories out, and steady progress.

Read More

Healthy Weight Loss Tips

Small, sustainable changes that tend to outlast the dramatic ones.

Read More
Coming Soon

SlimTrack Premium

The free tools above are just the starting point. SlimTrack Premium brings everything together into one place to track, one plan to follow.

Weight Tracking

Log your progress and see your trend over time, not just single days.

Smart Goals

Goals that adjust automatically as your progress and habits change.

AI Coach

Practical, personalized suggestions based on your real data.

Personalized Nutrition

Meal guidance that fits your goals, preferences and schedule.

Workout Plans

Structured routines that scale with your fitness level.

Progress Charts

Every metric, visualized together, so patterns are easy to spot.

Join the Waiting List Free during early access. No credit card required.

Start improving your health today — for free.

No account, no cost, no catch. Just open a tool and get your answer.

Start Free Today