Race Shape › Calculators › Ironman 70.3 Durban time predictor
Ironman 70.3 Durban · Sunday, 20 June 2027 (expected)Ironman 70.3 Durban time predictor
Ironman 70.3 Durban is a 1.9 km sea swim, 90 km bike and 21.1 km run at sea level. Type your own numbers and get a predicted finish.
| Leg | Time | |
|---|---|---|
| Swim | 40:17 | 1.9 km open water |
| Bike | 3:37:33 | 90 km at about 152 W |
| Run | 2:03:04 | 21.1 km, 11% slower than fresh |
| Transitions | 7:00 | T1 and T2 together |
Bike splits are decided by wind and terrain far more than by watts, so treat this as the shape of the day rather than a target.
Racing it well
The run off the bike is where a 70.3 is decided: about 11% slower than your fresh half-marathon pace for most age-groupers. Ride to the power target, not the bunch.
What the prediction includes
A swim from your CSS plus 6% for open water, a bike leg from a power balance at a sustainable share of FTP, a run from your running fitness slowed for running off the bike, and time for transitions. Wind decides bike splits far more than watts.
A full 20-week block for the Sunday, 20 June 2027 (expected) race starts on Monday Monday, 25 January 2027. The Ironman 70.3 Durban training plan page has the calendar and race-day targets.
Build my Ironman 70.3 Durban plan — free to buildSee your whole block before you pay.
Common questions
How do I predict my Ironman 70.3 Durban time?
Type a recent run race, your FTP and weight, and your CSS swim pace.
What is a good 70.3 time?
Many first-timers finish between six and seven hours. Your swim, FTP and run decide it; the calculator shows each leg.
When is the Ironman 70.3 Durban?
Sunday, 20 June 2027 (expected). Check the official entry page before booking anything.
When should I start training for the Ironman 70.3 Durban?
A full 20-week block starts on Monday Monday, 25 January 2027. A plan built later counts back from race day.