CALCULATOR

Carb Cycling Calculator

Training and rest day calories and carbs that average out to your weekly target, with protein held constant.

Carb cycling week

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Training day–

Rest day–

Protein, every day–

Fat, every day–

Carbs on training days–

Carbs on rest days–

Weekly average–

Carb cycling has no proven advantage over eating the same calories evenly. It suits people who prefer more food around training and are happy with less on rest days.

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How carb cycling works

Carb cycling means varying carbohydrate and total calories between training and rest days while keeping the weekly average at your target. Protein stays constant throughout, and fat usually does too.

The rationale is that carbohydrate is most useful around training, where it fuels performance and replenishes glycogen, and less necessary on rest days. Placing calories where the work happens is intuitively sensible.

The honest evidence position: no study has demonstrated that carb cycling outperforms eating the same weekly calories evenly distributed. It is a preference tool. If eating more on training days and less on rest days suits your appetite and adherence, it works. If it complicates things, even intake works equally well.

Frequently asked questions

Does carb cycling burn more fat?

No evidence supports an advantage over the same weekly calories eaten evenly.

How much should high and low days differ?

Commonly 10 to 30 percent either side of your target. Larger spreads make low days uncomfortable.

Should protein change between days?

No. Keep protein constant, since it protects muscle and is the least useful macro to cut.

Is this the same as a refeed?

No. Refeeds are occasional higher-carbohydrate days during a diet; carb cycling is an ongoing weekly structure.

Sources

Burke LM et al. Carbohydrates for training and competition. Journal of Sports Sciences, 2011.
Peos JJ et al. Intermittent Dieting: Theoretical Considerations for the Athlete. Sports, 2019.
Helms ER et al. Evidence-based recommendations for natural bodybuilding contest preparation. JISSN, 2014.
National Institutes of Health, Office of Dietary Supplements. Nutrient fact sheets. ods.od.nih.gov
NHS. Nutrition and health guidance. nhs.uk
US Departments of Agriculture and Health and Human Services. Dietary Guidelines for Americans, 2025-2030. dietaryguidelines.gov

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General information, not medical advice. Consult a qualified professional before changing your diet, especially with a medical condition.