How Many Miles Per Week Should You Run?
How many miles per week should you run? It depends on your goal and experience. See recommended weekly mileage ranges for 5K to marathon and how to build safely.
May 7, 2026 · 2 min read
How many miles you should run per week depends on your goal and experience. Beginners do well with 5–15 miles, 5K and 10K racers with 15–30, and half-marathon and marathon runners with 25–50 or more. Whatever your target, build toward it gradually — roughly 10% increases per week with periodic cutback weeks to absorb the load.
Recommended ranges by goal
- General fitness / new runner: 5–15 miles per week.
- 5K performance: 15–25 miles per week.
- 10K performance: 20–35 miles per week.
- Half marathon: 25–40 miles per week.
- Marathon: 30–50+ miles per week.
More mileage, more fitness — to a point
Up to a personal limit, higher weekly mileage generally improves endurance performance. But the returns diminish and the injury risk rises as volume climbs. The right amount is the most you can handle while recovering well, sleeping enough, and staying pain-free — not an arbitrary big number.
How to build mileage safely
- Increase total weekly distance by no more than about 10% at a time.
- Hold steady or cut back every third or fourth week.
- Add mileage through frequency and easy runs before adding intensity.
- Back off immediately if niggles appear — small aches become injuries when ignored.
The cutback week
Every few weeks, drop your mileage by 20–30% for a week. These planned reductions let your body consolidate fitness and are one of the best defenses against overuse injury.
Quality vs quantity
Mileage is only one lever. A runner doing 25 well-structured miles — mostly easy, with one quality session and a long run — often outperforms one logging 40 aimless miles at the same moderate effort. Pair sensible volume with smart workout structure for the best results.
Frequently asked questions
Is 20 miles a week good?
For many recreational runners, yes. Twenty miles a week supports solid 5K and 10K performance and general fitness. Half and full marathoners usually benefit from building higher, but 20 is a healthy, sustainable base.
How fast can I increase my weekly mileage?
A common guideline is to increase total weekly distance by no more than about 10% per week, with a cutback week every third or fourth week. Slower is fine and often wiser.
Does higher mileage make you faster?
Generally yes, up to your personal limit, because more aerobic volume builds endurance. But added too quickly it causes injury. The best mileage is the most you can sustain while recovering well and staying healthy.
Put it into practice
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