One-rep max

Tool id: one-rep-max · Methods: epley, brzycki, lombardi, wathan, oconner, mayhew

Estimate your one-rep max from a set you actually did (reps at a weight); reach for it to program percentages without testing a true max.

Input

Field	Type	Notes
weight	{ value, unit }	kg or lb — the weight used in the set
reps	integer	1–20
methods	string[] | "all"	defaults to "all"

Methods

• epley — Epley (1985).
• brzycki — Brzycki (1993).
• lombardi — Lombardi.
• wathan — Wathan.
• oconner — O’Conner.
• mayhew — Mayhew et al.

The output also includes a percent_table: loads (in the same unit as your input) at 50%, 55%, …, 95%, 100% of the consensus mean. Use it to set up percentage-based programming blocks without extra arithmetic.

Example

TypeScript

import { REGISTRY } from "@almostjacked/fitness-tools";
const orm = REGISTRY.get("one-rep-max")!;
orm.compute(orm.input.parse({
  weight: { value: 100, unit: "kg" }, reps: 5,
}));

curl

curl -s localhost:8080/v1/tools/one-rep-max \
  -X POST -H 'content-type: application/json' \
  -d '{"weight":{"value":100,"unit":"kg"},"reps":5}'

MCP

Call the one-rep-max tool with these arguments:

{
  "weight": { "value": 100, "unit": "kg" },
  "reps": 5
}

{
  results: [
    { method: "epley",    value: 116.7, unit: "kg", detail: null },
    { method: "brzycki",  value: 112.5, unit: "kg", detail: null },
    { method: "lombardi", value: 117.5, unit: "kg", detail: null },
    { method: "wathan",   value: 116.6, unit: "kg", detail: null },
    { method: "oconner",  value: 112.5, unit: "kg", detail: null },
    { method: "mayhew",   value: 119,   unit: "kg", detail: null },
  ],
  consensus: { mean: 115.8, median: 116.65, min: 112.5, max: 119, n: 6 },
  percent_table: [
    { percent: 50, load: 57.9  },
    { percent: 55, load: 63.7  },
    // …
    { percent: 95, load: 110   },
    { percent: 100, load: 115.8 },
  ],
}

Call it another way

Full docs for the other protocols: HTTP API · MCP server.