Free tool · No install

What's your real max?

You don't need to test a single to know. Give it a set you actually did — weight and reps — and get your estimated 1RM plus every training percentage you'd program off it.

How to run this

You're on an iPhone. A Beyond Normal card should have slid up from the bottom — tap Open and the calculator launches straight away. It's an App Clip: nothing installs, and it clears itself out when you're done.

No card? Pull down to refresh, or get the full app below.

This tool runs on iPhone. It's an App Clip — open this page on an iPhone and the calculator launches instantly with nothing to install. On a computer, you're reading the description rather than running it.

Text yourself this link, or install the full app below.

1 Rep Max calculator on iPhone: 225 lb for 10 reps using the Brzycki formula gives an estimated 300 lb max, followed by a training percentage table from 95% down to 60%.
This is the whole tool

An estimate, and what to do with it.

Most calculators stop at the number. This one keeps going and hands you the percentage table — because a max on its own doesn't tell you what to put on the bar on Monday.

Switch formulas and watch the estimate move. That disagreement is real information, not a rounding error.

225 × 10 → 300 lb (Brzycki) · your 5/3/1 training max is the 90% row: 270 lb
What you get back

Two things, not one.

The estimate, and the whole programming range worked out beneath it in your own units.

Your estimated 1RM

From any set between 1 and roughly 12 reps. Past that the math gets shaky and the app says so rather than quietly handing you a fantasy number.

The full percentage table

95, 90, 85, 80, 75, 70, 65 and 60 percent, worked out in your units. The whole programming range in one glance.

Three formulas

Because they disagree, and it matters.

Rep-max formulas are models, not measurements. They diverge most exactly where lifters use them most — the high-rep AMRAP set. Pick the one that matches how you actually train instead of accepting whatever a calculator picked for you.

Epley

weight × (1 + reps ÷ 30)

The simple, widely used linear estimate. The default, and the one most lifting charts are built on.

Brzycki

weight × (36 ÷ (37 − reps))

More conservative once the reps climb. If Epley's number feels generous after a set of ten, this is the sanity check.

Mayhew

Sigmoid model, bench-tested

Non-linear, and the most realistic of the three at higher rep counts.

90% is the number that matters in 5/3/1

Wendler's program doesn't run off your 1RM — it runs off a training max set at 90% of it, deliberately. That's the line on the percentage table to look at, and it's exactly what Beyond Normal builds your whole program from.

The full app

Set it up in under a minute.

Beyond Normal starts exactly here: tell it a max, or a recent set, and it builds your 5/3/1 program and shows you your first working set with the plates already counted. It never shows you a number you didn't give it. Then it tracks every cycle, catches every PR, and grades every session.

Get Beyond Normal Try the plate calculator