Know your splits before race day.
Free calculators and planners for long-course triathlon — predict your finish, plan your target pace, and dial in your splits for the 140.6 and 70.3 distances.
Plan your race backwards from your goal.
Chasing sub-12, sub-5, or a Kona slot? Set your target finish and your swim & bike, and see the exact run pace you need to hit it.
Open the pace planner →Triathlon calculators
Free tools to predict, plan and pace your race. More added regularly.
Finish Time Calculator Live
Predict your 140.6 or 70.3 finish from your swim, bike and run paces — with every split.
Target Pace Calculator Live
Set a goal time and see the exact run pace you need to hit it. Plan backwards.
Nutrition & Fueling Calculator Live
Carbs, sodium and fluid per hour → how many servings and bottles to carry.
Cutoff Checker Live
Will you beat the swim (2:20), bike (10:30) and overall (17:00) cutoffs?
Swim Pace Calculator Live
Per 100m/100yd pace ↔ total swim time for any distance.
Bike Split Calculator Live
Average speed → bike time for any distance, in mph or km/h.
Wetsuit Legal Checker Live
Enter the water temp → is a wetsuit legal, required, optional or banned?
Cost Calculator Live
How much does an Ironman really cost? Add up registration, gear, coaching and travel.
Course-Adjusted Finish New
Adjust your finish for a specific race — elevation, swim current and heat. 17 courses or your own.
Compare Courses New
Fastest vs hardest — rank 17 Ironman & 70.3 courses by difficulty and compare them side by side.
Triathlon guides
Plain-English race-day know-how — pacing, cutoffs and fueling for long-course triathlon.
How to pace your first Ironman
The beginner's plan — pace the swim, bike and run by effort so you finish strong instead of blowing up.
Ironman cutoff times explained
The 2:20 swim, 10:30 bike and 17:00 overall limits — how they work and how to make them.
Ironman nutrition guide
Carbs, sodium and fluid per hour — how to fuel a long-course race without wrecking your stomach.