The Math
Of Your Body.
Twelve free, science-grade calculators. Every output triangulated across classical formulas and modern sports-science. Your data stays on your device. Your plan follows.
This is not a diet app. It's a measurement system — built around your actual body, your actual goals, your actual week. Start with the Blueprint and the Engine derives everything from one entry.
100% Free · No signup · Data stays on your device
Generic advice is average advice.
Most fitness content is written for an audience. This engine is written for one person — you. Your BMR is not "around 1,600." It's a specific number derived from Mifflin–St Jeor, triangulated with Harris–Benedict and (when you know your body fat) Katch–McArdle.
Every calculator shows the math. Every formula is cited. So you can verify it yourself — and never have to blindly trust a coach again.
Then, when you're ready, the program that matches your numbers is one click away.
- Mifflin–St Jeor — ACSM-preferred BMR
- Katch–McArdle — lean-mass-aware BMR
- ISSN protein stand — 1.6–2.2 g/kg
- Navy method — body fat %
- WHO Asian BMI — Indian calibration
- Epley + Brzycki — 1RM estimation
Twelve Tools.
One System.
Start with the Blueprint — it derives TDEE, macros, body-composition targets, training focus, and a 12-week trajectory from a single form. Or open any tool individually.
You get the numbers.
Maddy builds the plan.
The Engine is free forever. When you're ready for someone to hold the rope — four programs, one built for you.
Start With The Blueprint.
One form. Every number you need. Zero signup. Your plan is built from here.
Generate My Blueprint →