Use Gatebreak's duathlon pace calculator to optimize your training and set achieveable goals for your upcoming race.

Enter your target paces for each race segment – the run, bike, run – as well as the transitions (T1 & T2).

The calculator then crunches the numbers, calculating the elapsed time for each segment before generating the total race time.

Whether you're training for your first sprint duathlon or aiming for a personal best in a long-distance event, having a clear understanding of your target paces is crucial to your success. Eliminate the guesswork from your race planning and get an accurate prediction of your finish time based on your expected speeds.

Here's how it works: Enter your comfortable pace for each discipline - whether that's your current speed or your target training time. The calculator handles all the math, showing you exactly how your next race might play out

1. Select a duathlon distance

Just above the calculator, you'll find an option to select your race distance. Choosing one of these options will automatically set the distances common to that event.

For example, selecting the "Sprint Duathlon" will set the first run distance to 5 km, the bike distance to 20 km, and the second run to 2.5 km. Selecting the "Standard Duathlon" distance will set the first run to 10 km, the bike to 40 km, and the second run to 5 km.

What if my event's race distances are non-standard? Edit the run, bike, or second run segment's distance values to adapt the duathlon calculator to your specific event.

Note - metric vs imperial: You can specify the distance units (kilometers or miles) by switching between metric and imperial units for distance and pace.

2. Enter your target pace for each race segment

After selecting a race distance, it's time to enter your target race times or your target race pace.

If you provide a target time for a segment, the calculator will generate the pace necessary to complete the distance in the given time.

If you provide a target pace, the calculator will determine how long it will take you to complete the distance.

Note: you can toggle between imperial and metric pace units - the duathlon calculator will handle the necessary conversions.

Run 1 pace: Set the pace unit to "minutes/mile (imperial) or "minutes/kilometer" (metric).
Bike pace: Set the pace unit to "miles per hour" (imperial) or "kilometers per hour" (metric)
Run 2 pace: Set the pace unit to "minutes/mile (imperial) or "minutes/kilometer" (metric)

You can set different run paces for each running segment. This allows you to account for different race strategies and fatigue levels.

3. Enter your Transition 1 and Transition 2 target times

Think about your race holistically - shaving a minute or two off of your transition times might be easier than shaving 2 minutes off of your 5km run time. Creating a plan for your duathlon transitions is a great way to "race smarter" instead of "racing harder."

Duathlon race distances are less standardized than triathlon distances. There are a few reasons for this, but two reasons stick out.

Triathlon is included as an Olympic sport (hence the popular "Olympic" distance triathlon).

The popular "Ironman" triathlon brand has helped standardize long-course events. In the triathlon community, the "70.3" and "140.2" serve as ubiquitous designations for the company's "half" and "full" distance triathlon events. The company puts on events around the world, which helps standardize the long course distances.

Unlike triathlon, duathlon is not an Olympic sport, so there's no "standard" duathlon distance. Duathlon events are also less popular than triathlons. Without a company like Ironman putting on events across the globe, expect duathlon distances to vary more.

There are the four most common duathlon race distances:

Short answer, yes!

Long answer: we use manual quality assurance and automated software testing processes to ensure that the duathlon calculator's core functionality - estimating your run, bike, and second run segment times - remains accurate.

Factors like fatigue, course terrain, and race-day weather can all impact your actual speeds. These considerations are outside of the duathlon calculator's control.

We welcome feedback! Please let us know if you run into any issues while using the duathlon calculator app.