# Cycling Power and W/kg Calculator

URL: https://speedycalculator.com/calculators/sports/cycling-power/
Last updated: 2026-10-25

> The cycling power calculator gives power-to-weight ratio in watts per kilogram from your FTP or race power and body weight, and your power zones based on FTP.

## Inputs

- FTP (W)
- Body weight (kg, lb, g, oz, st)
- Bike and kit weight (kg, lb, g, oz, st)

## Results

- Power-to-weight
- Including bike
- Endurance zone up to
- Threshold zone up to

## Formula

```
W/kg = power ÷ body weight
Zones: Z2 56–75%, Z3 76–90%, Z4 91–105% of FTP
```

## Explanation

Watts per kilogram determines climbing speed; FTP is the power you can hold for about an hour.

### How to use the Cycling Power and W/kg Calculator

- **FTP**
- **Body weight**
- **Bike and kit weight**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Divide power by weight; zone limits are percentages of FTP (Coggan model).

### Inputs explained

FieldWhat to enterFTPIn WBody weightUnits: kg, lb, g, oz, stBike and kit weightUnits: kg, lb, g, oz, st

### What each result means

- **Power-to-weight** = [FTP]÷[Body weight]
- **Including bike** = [FTP]÷([Body weight] + [Bike and kit weight])
- **Endurance zone up to** = [FTP]×0.75
- **Threshold zone up to** = [FTP]×1.05

### Example values

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

FTP (W)Power-to-weight (W/kg)1251.74187.52.62503.47312.54.343755.215006.94

## Worked example

Inputs — FTP: 250 W; Body weight: 72 kg; Bike and kit weight: 9 kg.

Results — **Power-to-weight = 3.47 W/kg**; Including bike = 3.09 W/kg; Endurance zone up to = 188 W; Threshold zone up to = 263 W.

## FAQ

**What is a good FTP?**
Around 3 W/kg is typical for fit amateurs; pros exceed 5.5 W/kg.

**How do I test FTP?**
A common test is 95% of your average power over 20 minutes.

**What formula does the Cycling Power and W/kg Calculator use?**
W/kg = power ÷ body weight.