Free Fasting Tools

Fasting Timer

Free intermittent fasting timer that runs in your browser. Start your fast, watch metabolic phases update live, and get notified when your window closes.

Fasting Calculator

Calculate your ideal fasting and eating windows based on your schedule, sleep time, and lifestyle. Get a personalised daily timeline.

TDEE Calculator

Calculate your Total Daily Energy Expenditure based on age, weight, height, and activity level. Free, instant, no signup.

Calorie Deficit Calculator

Calculate the right calorie deficit for your weight loss goal. See daily calories, weekly deficit, and time to reach your target weight.

BMR Calculator

Calculate your Basal Metabolic Rate — the calories your body burns at complete rest. Free BMR calculator using Mifflin-St Jeor formula.

Body Fat Calculator

Estimate your body fat percentage using the US Navy method or BMI method. Free calculator with fitness category and ideal range.

Macro Calculator

Calculate ideal daily macros based on your goal, body stats, and eating window. Free macro calculator for weight loss or muscle gain.

Water Intake Calculator

Calculate daily water intake based on weight, activity level, and climate. Includes fasting-specific hydration guidance.

Fasting Schedule Quiz

Answer 8 questions about your lifestyle and goals to find the perfect intermittent fasting protocol. Personalised recommendation.

Fasting Zone Tracker

Interactive fasting zones chart showing what happens to your body at every hour. See when fat burning, ketosis, and autophagy begin.

Weight Loss Calculator

Calculate how long to reach your goal weight based on your deficit, activity, and fasting schedule. Free weight loss timeline.

IF Results Estimator

Estimate your intermittent fasting results based on protocol, consistency, and starting stats. See 30, 60, and 90-day projections.

Autophagy Timer

Track when autophagy begins during your fast. Free timer showing exactly when cellular cleanup starts and how deep it goes.

Meal Window Planner

Plan meals within your intermittent fasting eating window. Set protocol, first meal, and get timing with calorie distribution.

Autophagy Calculator

Calculate when autophagy starts during your fast based on meal type, activity level, and age. See your personalised fasting phases and countdown to cellular cleanup.

Fasting Electrolyte Calculator

Calculate your exact electrolyte needs while fasting. Get daily sodium, potassium, and magnesium targets based on your weight, fast duration, and activity level.

Fasted Workout Calculator

Find your optimal workout timing during intermittent fasting. Enter your fasting schedule, workout type, and goal to get a personalised exercise plan.

How to Break a Fast

Get a personalised plan for breaking your fast safely. Enter your fast duration, goal, and dietary needs to see the best foods, timing, and what to avoid.

30-Day Fasting Challenge

Generate a personalised 30-day intermittent fasting challenge with progressive difficulty. Choose your level, set your schedule, and invite a buddy to join.