# Anaerobic Threshold Calculator

URL: https://speedycalculator.com/calculators/sports/anaerobic-threshold/
Last updated: 2026-10-30

> The anaerobic threshold calculator estimates your anaerobic (lactate) threshold heart rate as 85% of maximum heart rate, with the 80–90% range, using the maximum heart rate formula of your choice or a measured value.

## Inputs

- Age (years)
- Maximum heart rate formula
- Measured maximum heart rate (bpm)

## Results

- Maximum heart rate
- Anaerobic threshold
- Threshold range from
- Threshold range up to

## Formula

```
AT ≈ 0.85 × HRmax (range 0.80–0.90 × HRmax) · HRmax from Fox, Tanaka, Nes, Inbar, Gellish or Gulati
```

## Explanation

Above the anaerobic threshold, lactate builds up faster than your body can clear it and fatigue comes quickly. Training just below it improves endurance; knowing it helps you pace races.

### How to use the Anaerobic Threshold Calculator

- **Age (years)**
- **Maximum heart rate formula**
- **Measured maximum heart rate (bpm)**

Results update as you type, every field has its own unit menu, and everything is calculated in your browser.

### How it works

Enter your age and choose a formula, or enter a measured maximum heart rate.

### Inputs explained

FieldWhat to enterAge (years)A numberMaximum heart rate formulaChoose one: Fox – 220 − age, Tanaka – 208 − 0.7 × age, Nes – 211 − 0.64 × age, Inbar – 205.8 − 0.685 × age …Measured maximum heart rate (bpm)A number

### What each result means

- **Anaerobic threshold** = round(0.85×[Maximum heart rate])
- **Threshold range from** = round(0.80×[Maximum heart rate])
- **Threshold range up to** = round(0.90×[Maximum heart rate])

### Example values

How the main result changes when **Age** changes and everything else stays at the example values above:

Age (years)Anaerobic threshold (bpm)17.516626.251613515643.7515152.514670135

## Worked example

Inputs — Age (years): 35; Maximum heart rate formula: Tanaka – 208 − 0.7 × age.

Results — Maximum heart rate = 184 bpm; **Anaerobic threshold = 156 bpm**; Threshold range from = 147 bpm; Threshold range up to = 165 bpm.

## Key terms

- **Lactate**: By-product of fast energy production.

## FAQ

**What is the anaerobic threshold?**
The intensity above which lactate accumulates quickly.

**Is it the same as lactate threshold?**
Very close – the terms are often used interchangeably.

**How can I measure it accurately?**
A lab lactate test or a 30-minute time trial.

**Can I raise my threshold?**
Yes – tempo and threshold training raise it considerably.


## Sources

- [American Heart Association – Target heart rates](https://www.heart.org/en/healthy-living/fitness/fitness-basics/target-heart-rates)
- [ACSM's Guidelines for Exercise Testing and Prescription](https://www.acsm.org/education-resources/books/guidelines-exercise-testing-prescription)