Calculate Your One-Rep Max,
Load the Barbell Accurately.
Free lifting calculators: one-rep max from any set, percentage-based training loads, strength-to-weight standards, and warm-up ladders.
Epley & Brzycki Consensus
Weight × (1 + Reps/30): accurately predicts true maximal single effort from submaximal sets.
RPE & Percentage Loading
Generate 70%, 80%, and 85% training blocks for squats, bench presses, and deadlifts.
Olympic Plate Loading Matrix
Shows exact 45s, 25s, 10s, and change plates to slide onto standard 45-lb Olympic barbells.
LiftMath Calculators
One-Rep Max Calculator
Estimate your 1RM from any weight × reps set — Epley and Brzycki averaged, with a per-rep breakdown.
Training Percentage Calculator
Every training load from your 1RM — strength, hypertrophy, and power zones with rep ranges and rest guidance.
Strength-to-Weight Standards
Where your lift ranks by body weight — from beginner to elite, with the honest context about what standards mean.
Warm-Up Ladder Calculator
A ramped warm-up from the empty bar to your work set — loads, reps, and rest, ready to follow.
Evidence-Based Physiology
Percentage-based training: the system behind every serious program
Why "5×5 at 80%" beats "do some heavy sets," and how to run the percentages without becoming a robot.
How to estimate a 1RM you can actually program from
Set selection, reps-in-reserve calibration, and the re-estimation cadence.
12 mistakes people make with strength training math
The recurring errors we see in strength training math — what causes each one, and the habit that prevents it.