free lifting tools

strength-training calculators.

Fast, private tools for planning a lift. Calculations happen entirely in your browser, with no account, cookies, or saved workout data.

one-rep max calculator

Estimate the maximum weight you could lift for one repetition from a completed set of 1–10 clean reps.

estimate your 1RM

RPE calculator

Turn a set’s weight, reps, and RPE into an estimated 1RM and loads for RPE 8, 9, and 10, with the full RPE chart.

calculate from RPE

warm-up set calculator

Ramp from the empty bar to today’s working weight in a few loadable jumps, in pounds or kilograms.

build the ramp

barbell plate calculator

Enter a target weight and bar weight to see the standard plates needed on each side in pounds or kilograms.

load the bar

kg to lb converter

Convert between kilograms and pounds, see the nearest loadable weight, and check plate and bar equivalents.

convert a weight

built for quick decisions between sets.

These calculators answer the questions that come up between sets without asking for personal information: what a completed set says about your one-rep max, how hard a set was in RPE terms, how to warm up to a working weight, which plates to load, and what a weight is in the other unit.

They are companions to PR, the focused workout tracker for iPhone. PR handles the longer arc—planning workouts, logging sets, tracking personal records, and reviewing weekly training balance.