---
title: "One Rep Max Calculator"
method: GET
path: "/api/calc/one-rep-max-calculator"
tags: ["Health"]
---

# One Rep Max Calculator

`GET /api/calc/one-rep-max-calculator`

## Request

- Base URL: `https://calcbright.com`
- URL: `https://calcbright.com/api/calc/one-rep-max-calculator`
- Auth: none declared

Estimate your bench, squat or deadlift max from a submaximal set: Epley, Brzycki and Lombardi 1RM side by side, plus a % of 1RM table for programming.

## Query parameters

- `weight` number: Weight lifted
- `unit` 'kg' | 'lb': Unit
- `reps` number: Reps completed (reps) Most accurate with 2–10 reps taken close to failure.

## Response `200`

Calculation result

- CalcOutput
  - `ok` boolean
  - `tool` string
  - `name` string
  - `url` string: Open this link to see the full calculation
  - `inputs` object
  - `summary` string: Plain-text answer
  - `details` string
  - `result` object
  - `errors` object

## Other responses

- `400`: Invalid input (see errors)

---

[API](https://skmtc.dev/calcbright/apis/calcbright-calculator-api.md) · [All operations](https://skmtc.dev/calcbright/apis/calcbright-calculator-api/llms.txt) · [OpenAPI document](https://skmtc.dev/calcbright/apis/calcbright-calculator-api/revisions/f58229e56e58?raw)