IRONMAN World Championship · Kailua-Kona

Kona Race Modeller

Your numbers on the real course, in the wind and heat you will actually meet at the time you get there. See where your day is won and lost, then take the plan to the start line.

£28.80Kona race pass, incl. UK VAT · outside the UK, £24 plus any local tax, added at checkout · one payment, keeps working

Buy the race pass

One payment, no subscription. Up to 3 devices. Your licence key arrives by email straight away.

Your race pass is active on this device.

Open the modeller

The modeller: weather to plan for, your splits, and cards for your race plan, fuel plan and pacing.

What you get

Your race, minute by minute

Swim, bike and run splits from your power, pace, position and weight, with the wind and heat at every 100 m at the clock time you reach it.

The weather that matters

Ten years of real race-week days, then the NOAA forecast range in the last two weeks and the National Weather Service race-day forecast in the last three. See a typical day and a tough one, and plan for both.

A plan you can race

Power that rises on climbs and into the wind and never goes near FTP, aid stations with what to carry, heat stress on the run, where your time goes and what would move it, a printable race card and course files for Garmin and Wahoo.

See the course before you race it

Chase view of a rider on the Queen K with fountain grass and lava beside the road. — Chase your athlete along the Queen K with the modelled wind.

The swim: your athlete in the field off Kailua Pier. — The swim start, turn buoys and exit at the pier.

The Ali'i Drive finish: arms up under the arch with the modelled finish time. — Your modelled finish time on Ali‘i Drive.

How honest is it?

It uses real terrain along the course (USGS 3DEP elevation) and road-by-road wind direction, not a single average.
Weather models smooth out the gap winds at Kawaihae and on the Hawi climb. The tool says so, and shows you the spread rather than one number.
It is a plan, not a prediction. Drafting, traffic and how you feel on the day are not in the model.

Questions

What do I need to use it?

Your body mass, bike and kit weight, target bike power, run pace and swim pace. A CdA from a field test helps; if you do not have one, pick your bike position and it uses a sensible starting value. Ride files (.fit) can refine it.

Which devices does it work on?

Any recent phone, tablet or computer browser. The 3D view is lighter on phones. One pass works on up to 3 of your devices; sign out on one to free a slot.

Will my plan still be there next time?

Yes, on the same device. Your numbers, fuel plan and notes save in your browser, and Save this version keeps dated copies you can open or compare later. Nothing is stored on our server. To move to another device, or in case your browser clears its data (Safari does this after 7 days without a visit), use Download my plan file and load it again. Uploaded training files are read once and not kept.

How long does the pass last?

It does not expire. Plan now, re-plan with the forecast in race week, and review afterwards. The pass is for this year’s race; each race year is a new pass.

What happens to my data?

Your numbers and files stay in your browser. Files are read on your device and never uploaded. The site keeps one cookie to remember your pass. Payment is handled by Gumroad, which sends your receipt and licence key and handles VAT. Unlike our free tools, the modeller needs a paid key, but it still stores none of the data you enter.

Refunds

If it does not work for you, email info@ianwhiteperformance.com and we will sort it out.

Can I get a plan built around me?

Yes. The modeller shows what the numbers say. If you want your Kona race built from your own testing, racing and fuelling, get in touch.