Carb Cycling Planner
Free carb cycling planner: build high and low carb days from your base calories and protein floor. Supports high/low, training/rest, and three-tier patterns.
Carb cycling alternates between higher- and lower-carbohydrate days to match nutrient intake with training demand. Heavy training days get more carbs to fuel performance and recovery; rest or light days get fewer to preserve insulin sensitivity and create a slight deficit. The total weekly calorie average can still match your goal — the structure just shifts where the carbs land.
This planner builds a day-type macro template based on a base calorie target, your fixed protein and fat floors, and one of three cycling patterns: simple high-low alternation, training-vs-rest scheduling, or a three-tier high-medium-low system used by advanced athletes. Protein stays constant across all day types (because muscle protein synthesis runs daily regardless of carbs), and fat flexes inversely to carbs to balance the calorie equation.
Per-day macro template (training / rest)
training day
rest day
How this works
The math starts with three inputs: base calories (your maintenance or goal-calorie target, averaged across the week), protein grams (held constant — usually 2.0–2.2 g per kg of body weight), and fat grams (your hormone-protective baseline, typically 60–80 g).
Once protein and fat are locked, the calculator works out the base carb target by subtracting protein and fat calories from the daily calorie budget. Then it applies a multiplier per day type to shift carbs up or down:
- High-low: high days run +30% carbs at +10% total calories; low days drop to 50% of base carbs at 85% of base calories.
- Training-rest: training days hit 120% carbs at 105% calories; rest days fall to 40% carbs at 85% calories.
- Three-tier: high days at 150% carbs / 115% calories, medium at baseline, low at 30% carbs / 85% calories.
Fat is re-derived after carbs change so the daily calorie target stays accurate. Protein is locked because it’s the primary muscle-protective macro and doesn’t need to flex with training intensity.
Day scheduling: match high-carb days to your hardest sessions — heavy leg, back, and chest days. Use low-carb days on full rest or light cardio days. The weekly distribution is what matters; the most common schedule is 3–4 high days and 3–4 low days, averaging to your weekly calorie target.
When carb cycling helps most: when you’re in a deficit and training intensity is suffering on low-calorie days. Adding 50–100 g of carbs on training days can dramatically improve session quality without breaking the weekly deficit. For maintenance and bulks, the case is weaker — total calorie average dominates outcomes.
Frequently asked questions
- What is carb cycling?
- Carb cycling alternates between higher- and lower-carbohydrate days within the same week. The goal is to align carb intake with training demand — more on hard days, less on rest days.
- Does carb cycling actually work?
- For weight loss, total weekly calories matter more than the daily distribution. But carb cycling can improve training quality, hunger management, and adherence — all of which indirectly support fat loss.
- How do I choose between the three patterns?
- High-low is the simplest — alternate hard and easy days. Training-rest mirrors your gym schedule. Three-tier is for athletes who want a heavy, moderate, and easy tier — useful for periodized programs.
- Why does protein stay constant across day types?
- Protein needs are driven by lean mass and training stimulus, not daily calorie target. Keeping protein steady (2.0–2.2 g/kg) protects muscle whether the day is high-carb or low-carb.
- Why does fat change between days?
- Fat fills the calorie gap that carbs vacate on low days. On high-carb days, fat drops because carbs and protein take up most of the calorie budget; on low-carb days, fat rises to maintain hormonal health.
- Is carb cycling the same as keto?
- No. Keto keeps carbs near zero every day to stay in ketosis. Carb cycling allows high-carb days (200+ g) on training days, which would knock you out of ketosis. They are mutually exclusive approaches.
- How do I decide which days are "high" or "low"?
- Match high-carb days to your hardest training sessions (heavy compound days, long sessions). Match low-carb days to rest days or light cardio days. The training-rest preset does this automatically.
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