Question 1

What race types does the calculator support?

Accepted Answer

EnduranceOS supports Ironman 140.6 and 70.3 triathlons, marathons, ultra-distance races (50K, 50 mile, 100K, 100 mile), century rides, and gran fondos. Each race type has segment-specific nutrition strategies.

Question 2

Is the fueling calculator free?

Accepted Answer

Yes, completely free with no account required. You can generate unlimited nutrition plans, save them with shareable links, and export printable PDFs.

Question 3

How are carb, fluid, and sodium targets calculated?

Accepted Answer

Targets are based on published sports science: Jeukendrup's carbohydrate oxidation research, ACSM position stands on hydration, and Gagge/Stolwijk sweat rate models. The calculator adjusts for your body weight, experience level, race duration, and weather conditions.

Question 4

How does weather affect my nutrition plan?

Accepted Answer

The calculator auto-fetches forecast data (within 7 days) or historical averages for your race location. Heat and humidity increase sweat rate, so fluid and sodium targets adjust upward. In hot conditions (above 85°F), sodium needs can increase by 20% or more.

Fueling Blueprint Calculator