Ironman Distances in Miles & KM: All Race Formats
Exact Ironman distances for every race format — Full Ironman, 70.3, and 5150 — with miles and kilometer conversions. Use the tables below for quick reference.
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Complete Ironman Distance Chart
| Race Format | Swim | Bike | Run | Total Distance |
|---|---|---|---|---|
| Ironman 70.3 (Half) | 1.2 miles (1.9km) | 56 miles (90km) | 13.1 miles (21.1km) | 70.3 miles (113km) |
| Full Ironman | 2.4 miles (3.8km) | 112 miles (180km) | 26.2 miles (42.2km) | 140.6 miles (226km) |
| Ironman 5150 | 1.5km (0.93 miles) | 40km (24.9 miles) | 10km (6.2 miles) | 51.5km (32 miles) |
Ironman Distances in Kilometers (KM)
For athletes outside the US, here are all Ironman distances in kilometers:
| Race Format | Swim (km) | Bike (km) | Run (km) | Total (km) |
|---|---|---|---|---|
| Ironman 5150 | 1.5 km | 40 km | 10 km | 51.5 km |
| Ironman 70.3 (Half) | 1.93 km | 90.12 km | 21.09 km | 113.14 km |
| Full Ironman | 3.86 km | 180.25 km | 42.20 km | 226.31 km |
Ironman 70.3 (Half Ironman) Details
The Ironman 70.3, also known as Half Ironman, is the most popular long-distance triathlon format. The "70.3" name comes from the total distance in miles.
- Swim: 1.2 miles (1.9km) - typically in open water
- Bike: 56 miles (90km) - non-drafting format
- Run: 13.1 miles (21.1km) - half marathon distance
- Time Limit: 8 hours 30 minutes
- Typical Finish Time: 5:30-6:30 for age groupers
Full Ironman Distance Breakdown
The Full Ironman is the ultimate triathlon challenge, covering 140.6 miles of swimming, cycling, and running.
- Swim: 2.4 miles (3.8km) - open water mass start
- Bike: 112 miles (180km) - individual time trial
- Run: 26.2 miles (42.2km) - full marathon
- Time Limit: 17 hours from start
- Typical Finish Time: 12:00-13:30 for age groupers
Training Recommendations by Distance
Ironman 70.3 Training:
- • 10-15 hours per week training volume
- • 20-week structured training plan
- • Focus on aerobic base building
- • Weekly brick workouts (bike-run)
Full Ironman Training:
- • 15-20 hours per week training volume
- • 24-30 week structured training plan
- • Extensive aerobic base development
- • Multiple weekly brick sessions
Each Ironman distance presents unique challenges. For cutoff times and average finish times by ability level, see our Ironman time limits guide. Use the triathlon calculators to predict your splits and plan your nutrition.
Try a calculator
- Race Nutrition Planner — Ironman
Build a full-Ironman fuelling plan.
- Triathlon Race Time Calculator
Predict Ironman splits by pace and speed.
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