// multi-utility computation suite · offline · instant · precise
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health.one-rep-max Calculator
Estimates one-rep max (1RM) from a submaximal set weight and rep count using the Epley, Brzycki, and Mayhew formulas. Testing true 1RM risks injury — all three prediction formulas are accurate within 5% for 3–10 rep sets.
Inputs
Wt
Body or object weight. For health calculators, usually in kg or lbs.
Reps
Reference formula or conversion factor shown for context.
Bw
Body or object weight. For health calculators, usually in kg or lbs.
Goal
Reference formula or conversion factor shown for context.
Results
estimated 1RM
The value at the specified point or condition.
relative strength (×BW)
The value at the specified point or condition.
80% for hypertrophy
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).
85% for strength
Sample size or count used in the calculation.
gap to goal
Reference formula or conversion factor shown for context.