Free tool

Fasting Timer

Track your intermittent fasting window, get a reminder when it ends, and see how objective data turns fasting into real results.

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00:00:00Ready

Choose your protocol

Fasting works better with data

A timer tells you when. Pairing it with glucose, ketones, HRV and sleep tells you whether it’s working. Clinics use Heads Up to connect a client’s CGM, wearables and labs so fasting protocols are guided by outcomes, not guesswork.

Glucose & ketones

See how each fasting window shifts metabolism with CGM and Keto-Mojo data.

Recovery & sleep

Track how fasting affects HRV, resting heart rate and sleep over time.

Body composition

Prove progress with InBody trends, not just the scale.

Fasting timer FAQ

What is 16:8 fasting?+

Sixteen hours of fasting followed by an eight-hour eating window, the most popular intermittent fasting protocol. This timer also supports 18:6, 20:4, OMAD (23:1) and 36-hour fasts.

Does the timer keep running if I close the tab?+

Yes. Your start time is saved on your device, so the elapsed time stays accurate when you come back. Add your email for a reminder when the window ends.

Is fasting right for everyone?+

No. Fasting isn’t appropriate for everyone, including some people with diabetes, a history of disordered eating, or who are pregnant. This is educational, not medical advice; check with your clinician.

This tool is for general education and is not medical advice.

Online Fasting Timer + The Ultimate Fasting Dashboard

Unlike other fasting apps, Heads Up puts all your health metrics together so you can see the big picture as you implement fasting as part of your lifestyle.

Newly Redesigned Fasting Timer

Get started!

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Download The New Fasting Ebook One Fasting Timer & Dashboard
For All Your Fasting Metrics

Powerful Fasting technology combined with Heads Up's comprehensive health app

Thomas DeLauer – Professional Health Coach and Nutritionist

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"Fasting is easy conceptually, but when you’re in the thick of it, it’s a bit more complex. Heads Up puts the right metrics at your fingertips so you always know where you're at in the various stages of metabolic adaptation."

Read The Latest About Fasting

Fasting Stats On the Go

Use our mobile app to monitor your fasting stats on the go.

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Get More Fasting Data On The Web

Unlike other fasting apps, Heads Up puts all your health metrics and fasting timer together so you can see the big picture as you implement fasting as part of your lifestyle.

Dashboard

Spots The Health Trends

Create your own reports so you can learn exactly what works for your own body. Heads Up gives you powerful tools to track your progress, see your results and stay motivated!

Spot Trends

See How Fasting Affects Your Lab Test Results

Instantly sync your lab test results from Quest, LabCorp and thousands of other providers so you can see how fasting affects your overall health.

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Tired of logging into so many different systems? Gain full control of your health by centralizing all of your data in one place to see what truly works best for you.

Centralize your data

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Hack and track on the go

Master a healthy lifestyle on the go. Track and view all of your fasting data alongside metrics from your favorite apps inside the Heads Up dashboard no matter where you are!

Pick a Plan that Works for You

With a Heads Up subscription, you are becoming data-driven and self-directed on your path to optimal health. Heads Up is your compass on this journey.