Cycling to Running Conversion Calculator

Cycling to Running Conversion Calculator

A typical 30 km bike ride at moderate intensity is equivalent to about 10-12 km of running at a comfortable pace. The exact conversion depends on your speeds and effort levels, which our calculator determines using scientifically-validated MET values.

This calculator helps cyclists, runners, and triathletes understand training equivalence between these two sports. Whether you're substituting a bike ride for a run due to injury, planning cross-training, or curious about your workout's "running equivalent," this tool provides accurate, personalized conversions.

The Science Behind the Conversion

Two workouts are considered "equivalent" when they have the same metabolic load, measured as total energy expenditure (kcal) or MET-minutes. MET (Metabolic Equivalent of Task) represents the energy cost of an activity relative to sitting quietly.

Core Formula: Drun = Dbike × (METbike / METrun) × (vrun / vbike)

Three Calculation Modes

1. Quick Ratio Mode

Uses intensity-based conversion factors derived from typical MET values:

Intensity	Conversion Factor	Example
Easy spinning	1 km run ≈ 4 km bike	40 km ride = 10 km run
Moderate effort	1 km run ≈ 3 km bike	30 km ride = 10 km run
Hard/hilly	1 km run ≈ 2.5 km bike	25 km ride = 10 km run

2. MET-Based Mode (Recommended)

Uses your actual cycling speed and running pace to calculate precise MET values from the Compendium of Physical Activities, then equalizes MET-minutes between activities.

MET Values by Cycling Speed

Cycling Speed	MET Value
16-19 km/h (10-12 mph) - Light	6.8
19-22 km/h (12-14 mph) - Moderate	8.0
22.5-26 km/h (14-16 mph) - Vigorous	10.0
26-30 km/h (16-19 mph) - Racing	12.0

MET Values by Running Speed

Running Speed	MET Value
8.0 km/h (5 mph) - Easy jog	8.3
9.7 km/h (6 mph) - Moderate	9.8
11.3 km/h (7 mph) - Steady	11.0
12.9 km/h (8 mph) - Fast	11.8
14.5 km/h (9 mph) - Racing	12.8

3. Power-Based Mode (Most Accurate)

Uses ACSM (American College of Sports Medicine) metabolic equations for precision:

The "1 kcal per kg per km" rule for running is well-established in sports science and provides a reliable conversion from cycling energy expenditure to equivalent running distance.

Example Calculation (MET-Based)

For a 70 kg cyclist riding 60 km at 28 km/h, wanting to find the equivalent run at 10 km/h:

Why the "1:3 Rule" Exists

The common coaching rule "1 mile running = 3 miles cycling" comes from comparing moderate-intensity activities:

• Running at 5 mph (8 km/h) = ~8.3 METs
• Cycling at 12-13 mph (20 km/h) = ~8.0 METs
• At equal time, 5 miles running ≈ 12-13 miles cycling
• This gives roughly a 1:2.5 to 1:3 ratio

Our calculator refines this by using your actual speeds, providing a personalized ratio rather than a one-size-fits-all estimate.

Important Limitations

This calculator compares metabolic load only. It does not account for:

• Eccentric loading: Running creates higher muscle and bone stress from impact
• Neuromuscular differences: Sport-specific training adaptations differ
• Terrain effects: Hills, wind, and road surface vary calorie burn
• Individual biomechanics: Running economy varies between individuals

Use these conversions for general training load comparison, not as exact substitutions for race-specific preparation.