Calorie Cycling Calculator

About this calculator

Calorie cycling (also called zig-zag dieting) alternates between higher-calorie and lower-calorie days across a week, rather than eating the same fixed amount every day, while still averaging out to the same weekly calorie total needed for a given weight goal. The calculation works backward from your average daily target: given a number of high days and how much extra they contain, the calculator solves for how many calories the remaining low days must have so the weekly average still lands on target.

Dieters and coaches use calorie cycling to make a calorie deficit more psychologically sustainable — higher-calorie days can be scheduled around workouts, social events, or simply as a mental break from constant restriction — while some research also suggests cycling calories may help mitigate the metabolic adaptation (slowing metabolism) that can occur with a constant, unchanging deficit over long periods, though the weekly total, not the daily pattern, remains the primary driver of weight change.

This calculator takes your average daily calorie target, how many high days you want per week, and how much extra those high days should contain, then returns the exact high-day and low-day calorie targets, so your zig-zag plan still averages to your weekly goal.