FitSuite Tools

Macro Calculator for Runners

Running demands a carbohydrate-focused nutrition approach, especially for endurance events. Use our calculator to find your baseline macros, then adjust for your training volume, race schedule, and performance goals.

Carbohydrate Needs for Runners

Runners need more carbohydrates than most other athletes due to the high glycogen demands of endurance exercise. Guidelines recommend 5-7g of carbs per kg body weight for moderate training (1 hour/day), 7-10g for heavy training (2-3 hours/day), and 10-12g for extreme training or carb-loading before races. Protein needs are moderate at 1.4-1.8g per kg.

Race-Day and Long Run Nutrition

For runs over 90 minutes, consume 30-60g of carbohydrates per hour during the run (gels, sports drinks, or easily digestible foods). The night before a long run or race, eat a carb-rich dinner. Morning of, eat 1-4g of carbs per kg body weight 2-4 hours before the start. Practice your race nutrition strategy during training runs to avoid GI distress.

Frequently Asked Questions

How many carbs do runners need?
It depends on training volume: 5-7g per kg body weight for moderate training, 7-10g for heavy training, and 10-12g for extreme volume or pre-race carb loading. For a 70 kg runner training moderately, that is 350-490g of carbs daily.
Should runners do low-carb or keto?
For most runners, a low-carb approach impairs high-intensity performance. While fat adaptation can work for ultra-endurance events at low intensity, carbohydrates remain the preferred fuel for training and racing at moderate to high intensities. A low-carb approach is not recommended for competitive runners.

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