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VO₂ Max Calculator

Aerobic fitness estimate from max HR and RHR. Free online VO₂ Max Calculator for health — instant, accurate results, mobile-friendly, no signup needed.

VO₂ max
44.723077

Derivation

  1. ├── 01Givenmaxhr = 190, rhr = 65
  2. ├── 02Formulae.maxhr / e.rhr × 15.3
  3. ├── 03Substitutee.190 / e.65 × 15.3
  4. └── 04Compute VO₂ max44.723077
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§01What is

Understanding the VO₂ Max Calculator

The VO₂ Max Calculator computes VO₂ max from 2 inputs: max hr, resting hr. Aerobic fitness estimate from max HR and RHR.

Health metrics give us objective checkpoints against a body that can feel unreliable. Used alongside professional guidance — not in place of it — these numbers help you track progress and spot trends that matter. The VO₂ Max Calculator sits in that toolkit — it aerobic fitness estimate from max HR and RHR. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02The Formula

How it’s calculated

e.maxhr / e.rhr × 15.3

Where

maxhr
Max HR
rhr
Resting HR
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: Max HR = 190, Resting HR = 65.

  1. 01Start by noting the input — Max HR: 190.
  2. 02Start by noting the input — Resting HR: 65.
  3. 03Substitute these values into the formula: e.maxhr / e.rhr × 15.3
  4. 04Compute VO₂ max: the calculator returns 44.7231.
  5. 05Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants

Common VO₂ Max Problems

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.

01 · PATTERN

Max HR halved

maxhr = 95 (from 190)

Keep every other input at its default and halve the max hr. See how vo₂ max responds.

  1. 01New Max HR: 95
  2. 02Baseline VO₂ max: 44.7231
  3. 03New VO₂ max: 22.3615
  4. 04VO₂ max decreases by 50% → use this sensitivity to plan for real-world variation.
02 · PATTERN

Max HR doubled

maxhr = 380 (from 190)

Keep every other input at its default and double the max hr. See how vo₂ max responds.

  1. 01New Max HR: 380
  2. 02Baseline VO₂ max: 44.7231
  3. 03New VO₂ max: 89.4462
  4. 04VO₂ max increases by 100% → use this sensitivity to plan for real-world variation.
03 · PATTERN

Resting HR halved

rhr = 32.5 (from 65)

Keep every other input at its default and halve the resting hr. See how vo₂ max responds.

  1. 01New Resting HR: 32.5
  2. 02Baseline VO₂ max: 44.7231
  3. 03New VO₂ max: 89.4462
  4. 04VO₂ max increases by 100% → use this sensitivity to plan for real-world variation.
04 · PATTERN

Resting HR doubled

rhr = 130 (from 65)

Keep every other input at its default and double the resting hr. See how vo₂ max responds.

  1. 01New Resting HR: 130
  2. 02Baseline VO₂ max: 44.7231
  3. 03New VO₂ max: 22.3615
  4. 04VO₂ max decreases by 50% → use this sensitivity to plan for real-world variation.
§05FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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