About Fasting Toolkit

Fasting Toolkit is a free set of browser tools for people who want to plan and track the timing of their meals: a fasting timer, an eating-window calculator, a schedule calculator, a weekly planner, a fasting log with a water tracker, an adult BMI calculator and a printable 7-day planner. There is no account and no app to install.

Who runs it

Fasting Toolkit is an independent website created and run by Lee Palmer, who builds small, practical tool websites. Lee is not a doctor or dietitian, and the site does not give medical advice. It started as a simple, private timer without the streaks, badges and sign-ups found in many fasting apps, and grew into a small set of planning tools.

How the tools work

Every tool runs in your web browser. The timer saves its start time, and the planner and log save their entries, in your browser’s local storage on your device. Nothing is sent to a server or shared with anyone. The BMI calculator does not save your height or weight at all. You can download a backup of your log at any time.

The tools are deliberately neutral. They show clock times and elapsed hours without scores, streaks or targets you are pushed to beat, because how a person eats is personal and fasting is not right for everyone.

How we write our guides

Guides that touch on health are based on public information from established health organisations, including the National Institute on Aging, the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), Johns Hopkins Medicine and the CDC. Each guide links to its sources so you can read them yourself. We avoid claims the evidence does not support, say where research is limited, and point readers to a healthcare professional for individual decisions. Guides are reviewed when sources change, and the review date is shown at the bottom of each one.

Advertising

Fasting Toolkit is free and may show ads to cover its running costs. Advertisers have no influence on the tools or guides, and ad code never receives the information you enter. See the privacy policy.

Contact and corrections

If you find an error, a broken tool or an out-of-date source, email contact@fastingtoolkit.com. Include the page address and what you expected to see. We check every report and update the page when needed.

Last updated October 9, 2026.