Miles vs Kilometers: What Marathon Runners Need to Know

Why Runners Need Both Units: Most international races use kilometers. The US and UK still use miles for many events. A marathon is 42.195 kilometers, which is exactly 26.219 miles. Half-marathons are 21.0975 km or 13.109 miles. Knowing both units lets you train with any plan, regardless of origin.

Pace Conversion Quick Guide: A 5:00 min/km pace equals roughly 8:03 min/mile. A 4:00 min/km pace equals roughly 6:26 min/mile. Many GPS watches can display both, but understanding the math helps when reviewing training plans or comparing race splits from different countries.

Race Distance Reference Table: 5K = 3.106 miles. 10K = 6.213 miles. 15K = 9.320 miles. Half-marathon = 13.109 miles. Marathon = 26.219 miles. Ultra distances (50K, 100K, 100 miles) all require fast mental conversion when reading international race results.

Training Plan Tip: If your plan is in miles but your watch shows kilometers, convert the key distances once and tape them to your fridge. Or use ConvertNow's mile-to-kilometer converter to rewrite the plan in your preferred unit before starting.