About SweatMath
SweatMath is a free collection of browser-based health & fitness calculators. Every tool runs entirely on your device — nothing you type is sent to a server or stored anywhere.
What you'll find here
- BMI calculator
- Daily calorie needs (BMR & TDEE)
- Body fat estimate
- Running pace converter
- One-rep max estimator
- Macro planner
- Hydration estimate
- Heart-rate zones
Who's behind it
SweatMath is a project by Manuel Najera, built to make practical fitness math fast and free for everyone.
Contact
Questions, feedback, or a calculator you'd like to see? Reach out at mnajera062812@gmail.com.
A quick note
These calculators give general estimates for informational purposes only — not medical advice. Talk to a qualified professional before making big changes to training or nutrition.