One-rep max calculator

Estimate a one-rep max (1RM) from a set of weight × reps, with a percentage table and the load each rep count should allow. Epley by default, Brzycki optional. Estimates above 10 reps are flagged as less reliable.

Method: Epley (1985): weight × (1 + reps ÷ 30), a single counts as the weight itself. Brzycki (1993): weight × 36 ÷ (37 − reps). Tables round to the nearest 0.5.

get/api/tools/one-rep-max

Request

  • Base URL: https://www.ironledger.app
  • URL: https://www.ironledger.app/api/tools/one-rep-max
  • Auth: none declared

Query parameters

weightnumber required

Weight lifted for the set.

repsinteger required

Reps completed, 1 to 30.

unit'kg' | 'lb'

Weight unit for every load in and out: kg or lb.

formula'epley' | 'brzycki'

One-rep max formula: epley (weight × (1 + reps ÷ 30), the one the IronLedger app uses) or brzycki (weight × 36 ÷ (37 − reps)).

Response

The result, a one-line summary, the method used and a link to the same result on the site.

toolstring required
versionstring
summarystring required
resultobject required
methodstring
urlstring uri required

Changes

No recorded changes to this operation across all 1 revision of this API.