Free tools
HYDRAX does the maths.
Race day goes better when the numbers are worked out before the start line. These calculators turn your own weight, sweat and pace into a plan you can rehearse in training. Free, no account needed.
Race fuel plan builder
- You put in
- Weight, sweat rate, event, forecast
- You get
- Carbs and fluid per hour, what to pack, an hour-by-hour table
Sweat rate calculator
- You put in
- Two weights, session time, what you drank
- You get
- Litres of sweat per hour
Carb loading calculator
- You put in
- Body weight, expected finish time
- You get
- Grams of carbohydrate per day and on race morning
Triathlon calculator
- You put in
- Swim, bike and run pace, T1 and T2
- You get
- Predicted finish, or the run pace you need for a target
Running pace calculator
- You put in
- Distance and pace, or a target time
- You get
- Finish time or the pace you need
Cycling speed calculator
- You put in
- Distance and speed, or a target time
- You get
- Ride time or the average speed you need
New tools by email
Fuelling notes and new tools by email, plus 20% off your first order. Unsubscribe any time.
For clubs and coaches
Put these on your club website
Free for clubs, coaches and event organisers. Paste the code into any web page. It stays up to date, and your members never have to leave your site to use it.
Race fuel plan builder
<iframe src="https://hydrax.com.au/embed/fueling-strategy" title="Race fuel plan builder" width="100%" height="900" style="border:0;max-width:720px" loading="lazy"></iframe>
Sweat rate calculator
<iframe src="https://hydrax.com.au/embed/sweat-rate" title="Sweat rate calculator" width="100%" height="620" style="border:0;max-width:720px" loading="lazy"></iframe>
Carb loading calculator
<iframe src="https://hydrax.com.au/embed/carb-loading-calculator" title="Carb loading calculator" width="100%" height="640" style="border:0;max-width:720px" loading="lazy"></iframe>
General information for healthy adult athletes, not medical or dietetic advice. For a plan built around you, talk to a sports dietitian.