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Calcimator

Ultra Marathon Nutrition Calculator

Plan calories, electrolytes, and fluid intake per hour for ultra marathon distances. Get personalized nutrition targets based on weight, pace, and conditions.

Inputs

miles
lbs
°F

Results

Target Calories/Hour

234 cal

Carbs per Hour58 g
Fluid per Hour20 oz
Sodium per Hour400 mg
Potassium per Hour150 mg
Estimated Finish Time10h 0m
Total Calories Burned5,840 cal
Total Calories to Consume2,336 cal
Total Fluid Needed6 L
Total Sodium Needed4,000 mg
Total Caffeine Target290 mg
Aid Station Stops9
Calories per Stop260 cal
How to Use This Calculator
  1. Enter your Race Distance in miles, Body Weight in pounds, and Expected Pace.
  2. Set the Expected Temperature and your Effort Level (easy, moderate, or hard).
  3. Review target Calories per Hour, Carbs per Hour, Fluid per Hour, and Sodium per Hour.
  4. Check the Estimated Finish Time and Total Calories Burned for full-race planning.
  5. Use these targets to build your aid station nutrition strategy and drop bag contents.
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