BoxLogThe calculator
| % | Weight |
|---|---|
| Type your 1RM and every percentage shows here. | |
Any percentage, both ways
Type a percentage or a weight — the other one follows.
Don’t know your 1RM?
Type the weight and reps of a set, and we will estimate it.
How it is worked out
Each percentage is your 1RM times that percentage: with a 100 kg 1RM, 75 % is 75 kg. We show it to one decimal; on the bar, load the closest your plates allow.
What if I don’t know my 1RM?
Type the weight and reps of a set, and the calculator gives you an estimate of your 1RM. That is what it is, an estimate: the fewer reps in the set, the closer it gets to your real max.
What percentages are for
Strength programmes are written as percentages of your 1RM — a 5 × 5 at 75 %, singles at 90 % — so every athlete loads their own. If your 1RM is months old, so are your percentages: log every new best.
In BoxLog, with nothing to work out
In the app, every movement keeps your best, its history and its percentage table already worked out, in kg or lb, with this same calculator both ways. What else BoxLog logs.
Coming soon to the App Store and Google Play
BoxLog is already being tested in real boxes. Follow us on Instagram and be the first to know the day it reaches your phone.