Vandersoft
One Rep Max app ยท iOS and Android

Track your one rep max on every lift.

Know your max without ever testing one.

Log any hard set and get an estimated 1RM averaged across seven formulas, the percentage table you train off, and the plates to load. Then watch the number climb.

Download One Rep Max on the App StoreGet One Rep Max on Google Play

One Rep Max app estimating 246 pounds from 225 for three reps, between a bench press progress chart and a lift overview with a goal
7
Formulas averaged
10
Rep maxes, 2RM to 11RM
lb or kg
Plates per side
Free
iPhone and Android

See it in action

An estimate from any set, every formula side by side, the plates to load, and a chart of every lift so you can see your max climbing.

One rep max calculator estimating 246 pounds from 225 for three reps, with the full rep max table belowThe seven 1RM formulas the app averages, with the Epley equation shownPlate breakdown for a working set, with the nearest weight the bar can actually be loaded toExercise list showing current and best one rep max for the squat, bench, deadlift, and pressBench press one rep max plotted over several months of logged setsLift overview with total progress, total volume, and a one rep max goal with a target date

Everything a max is good for

The calculator is where it starts. The app keeps every number, turns it into the weights you load, and shows you whether it is going up.

What you get06 / 06
1RM

A max from any set

Enter the weight, the reps and how hard it felt. The estimate averages seven formulas, and you can switch off any you do not trust.

TABLES

Rep maxes and percentages

Every rep max from 2RM to 11RM and every training percentage, worked out from your current max.

PLATES

Plates per side

Each percentage comes with the plates to load and the nearest weight your plates can actually make, in pounds or kilos.

LIFTS

Every lift in one place

Squat, bench, deadlift, press or anything else, each with its current and best 1RM side by side.

CHART

Watch it climb

Every logged set is plotted, so a lift that is moving and a lift that has been flat since spring look completely different.

GOALS

A number to chase

Set a target max and a date, and the app tracks how much you have added, how much is left, and the pace you need.

Estimate instead of testing

Testing a true one rep max is taxing, needs a spotter, and is only accurate on the day you do it. A hard set of three to five gives you a number that is nearly as useful and costs you nothing. Since most programs are written as percentages of a max, that estimate is the number you actually need.

Enter the weight, the reps, and optionally how hard the set felt. You get the estimate and the whole rep max table underneath it.

Seven formulas, not one opinion

Epley, Brzycki, Lombardi, Mayhew, McGlothin, O'Conner, and Wathan all estimate the same thing and all disagree, sometimes by several percent. Rather than pick one silently, the app averages them, and you can switch any of them off if you prefer a particular one.

If you want the math behind them, the guide to calculating a one rep max works through the equations and where they diverge, and our one rep max calculator runs all seven in the browser if you want to try it before installing anything.

Where to go next

Once you have a max you trust, the 5/3/1 app will build a full training cycle from it, and the barbell plate calculator turns any working weight into the plates to load.

Common questions

Is the One Rep Max app free?
Yes. It is free to download on iPhone and Android, with an optional subscription for the extra features.
How many reps should I use for the best estimate?
Between three and six, taken close to failure. Higher rep sets drift further from reality because fatigue and conditioning start dominating the result.
Which formula is most accurate?
None is universally best. Epley tends to read slightly higher at high reps, Brzycki slightly lower. Averaging several is usually steadier than trusting any single one, which is why that is the default.
What does the RPE field do?
It records how close to failure the set was. A set of five with two reps left in the tank implies a higher max than a set of five you barely finished, and recording it keeps your history honest.
Do I need to test a real max to use this?
No. That is the point. Log any hard set and the estimate follows from it.
Does it work in kilos?
Yes. Pounds or kilos, including the plate breakdown and the rounding to a loadable weight.
Why is the suggested weight not exactly the percentage?
Because bars take plates, not decimals. The app rounds to the closest weight your plates can build and tells you what that weight is.

Stop guessing your max. Start tracking it.

Free on iPhone and Android.

Download One Rep Max on the App StoreGet One Rep Max on Google Play