Free lifting calculators
Ten tools for the parts of training that are just arithmetic. No account, no email, no gate on the answer — and what you type in one is remembered by the next.
Under the bar
Everything between deciding what to lift and putting it back on the rack — maxes, percentages, plates and the ramp up to them.
1RM Calculator
Six formulas, one honest range — not a single made-up number.
Rep Max Chart
One max in, your full 1–12RM table out.
Plate Calculator
Stop doing plate math mid-set.
Warm-Up Calculator
From empty bar to working set, in the right number of steps.
RPE Calculator
RPE, RIR and %1RM — converted in both directions.
Strength Standards
Where your lifts actually sit, by bodyweight.
During the session
For while the set is actually happening.
Eating for it
What it takes to recover from the training and keep the muscle you build.
These are the manual version
Every tool here answers one question, once, and forgets you when you close the tab. Corect does the same arithmetic continuously: it knows what you lifted last week, updates your maxes as you get stronger, plans the session, logs every set, and films your lifts to score each rep with on-device AI.
See the app