A small, honest set of fitness tools.

Every calculator on this site uses formulas published in peer-reviewed research or used by recognised governing bodies — Mifflin–St Jeor for metabolic rate, Epley and Brzycki for one-rep-max estimation, IPF coefficients for Wilks and DOTS scoring, and so on. Where multiple formulas exist for the same thing, both are shown so you can compare.

Nothing here is medical advice. Calculators are estimates. They are useful starting points for setting a calorie target or comparing your lifts, not a substitute for a coach, a dietitian, or a doctor.

Why this exists

I built LiftMacro because I'm a broke college student who lifts, and every decent fitness calculator I found was locked behind a paywall, a sign-up form, or an app subscription. Five dollars a month here, ten there — it adds up to more than my grocery budget, and all for tools that are basically high-school algebra under the hood.

So I made a free version of the tools I actually use. No accounts, no upsells, no “unlock premium for advanced macros.” If it helps one other student skip a subscription they didn't need, that's the whole point. Suggestions, corrections, and bug reports are welcome — see the contact page.

How the site makes money

The calculators are free and will stay that way. Some pages may eventually include affiliate links to fitness products (clearly disclosed) or display advertising once traffic supports it. There are no accounts, no email collection, and no tracking beyond privacy-friendly page analytics.