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Both calculators run independently — change the inputs on either side to compare results.

Intermittent Fasting Calculator

Calculates your eating window end time and per-meal calorie distribution based on your fasting protocol, first meal time, and daily calorie goal. Use it when starting 16:8, 18:6, or any time-restricted eating plan.

Fasting Hours

First Meal Time (24hr format) (hour)

Fill in the required fields to see your result.

Weight Loss

Intermittent Fasting Calculator

Plans your daily eating window, meal end time, and per-meal calorie distribution for any intermittent fasting protocol. Ideal for structuring 16:8, 18:6, or custom fasting schedules around your lifestyle.

Fasting Hours

First Meal Time (PM (24hr format: use 12-23))

Daily Calorie Target (calories)

Meals in Eating Window

Fill in the required fields to see your result.

Key differences

	Intermittent Fasting Calculator	Intermittent Fasting Calculator
Category	Weight Loss	Weight Loss
Inputs required	2	4
Result	Last Meal Time (hour (24hr format))	IF Schedule Details (hours)
What it does	Calculates your eating window end time and per-meal calorie distribution based on your fasting protocol, first meal time, and daily calorie goal. Use it when starting 16:8, 18:6, or any time-restricted eating plan.	Plans your daily eating window, meal end time, and per-meal calorie distribution for any intermittent fasting protocol. Ideal for structuring 16:8, 18:6, or custom fasting schedules around your lifestyle.