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Know what to eat, hour by hour.

Krasen Slavov

Builds UltraCalcPal

Krasen Slavov builds UltraCalcPal, the app that turns weight, hours, effort and weather into a fuel plan with carbs, fluids and sodium per hour, aid-station bags and a crew link. These guides come from the questions the app is built to answer.

Posts by Krasen Slavov

Fuelling · November 12, 2026 · 5 min readHow many carbs per hour in an ultra? Ranges, limits and a worked exampleCarbs per hour in an ultra: the usual 60 to 90 gram range, why body weight and effort matter, what your gut can absorb and a worked example.