1. What is an Ultra Marathon?

An ultra marathon is any footrace longer than the traditional marathon length of 42.195 kilometers (26.219 miles). These races test endurance beyond the standard marathon distance.

2. Standard Ultra Marathon Distances

The most common ultra marathon distances include:

• 50 kilometers (31.07 miles) - The shortest standard ultra distance
• 100 kilometers (62.14 miles) - A common ultra distance
• 50 miles (80.47 km) - A classic ultra distance
• 100 miles (160.93 km) - The "century" distance for ultras

3. Distance Conversion

Conversion Factor: 1 kilometer = 0.621371 miles
Example: 100 km = 100 × 0.621371 = 62.1371 miles

4. Using the Distance Chart

Tips: Select your preferred unit (km or miles) to view the standard ultra marathon distances in that measurement system.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between trail and road ultras?
A: Trail ultras are run on natural terrain with elevation changes, while road ultras are on paved surfaces. Distances are the same but trail times are typically longer.

Q2: Are there standardized ultra marathon distances?
A: While there are common distances, many ultras have unique distances based on terrain or historical reasons (e.g., 135 miles for Badwater).

Q3: How long does a 100-mile ultra take?
A: Completion times vary widely from 12-14 hours for elite runners to 24-36 hours for average runners.

Q4: What's the longest official ultra marathon?
A: The Self-Transcendence 3100 Mile Race is the world's longest certified footrace.

Q5: How should I train for my first ultra?
A: Gradually increase mileage, incorporate back-to-back long runs, and practice race-day nutrition strategies.