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Intermittent Fasting Timer
A free intermittent fasting timer for 12:12, 14:10 and 16:8: start the clock, watch the ring fill and see when your eating window opens. Keeps running if you close the page. Safety check first.
Before you start
Time-restricted eating isn't right for everyone. Don't use this timer without your doctor's OK if you:
- are under 18, pregnant, breastfeeding or trying to get pregnant
- have diabetes or take medicine that lowers blood sugar
- have or have had an eating disorder
- have a medical condition, are underweight, or take medicines that must be taken with food
Stop and eat if you feel dizzy, shaky, faint or unwell. Drink water during the fast.
Tips
- Start with 12:12 (often just no late-night snacks) before trying longer fasts.
- Water, plain tea and black coffee are usually fine during the fast.
- Break the fast with a normal, balanced meal, not a feast.
- Missed a day? No problem: consistency matters more than perfection.
✅ Rules last checked:
📚 Official sources: Johns Hopkins Medicine: Intermittent fasting
We build every tool from the official rules and re-check them when they change. Always confirm with the official source before you rely on a result.
🛠️ Spotted a mistake or an out-of-date rule? Tell us
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Questions people ask
Who shouldn't do intermittent fasting?+
Anyone under 18, pregnant or breastfeeding, people with diabetes or on medicine that lowers blood sugar, anyone with a past or current eating disorder, and people with medical conditions, unless their doctor says it's OK.
Can I drink during the fast?+
Water, plain tea and black coffee are usually fine. Drink water through the fast.
Does the timer keep running if I close the page?+
Yes. The start time is saved in your browser on this device, so the timer carries on when you come back.