Intermittent Fasting Timer
36 Hour Fast Calculator
Calculate when your 36 hour fast ends, track time completed, see hours remaining, and view milestone checkpoints like 12, 18, 24, and 36 hours. This tool helps you plan a longer fast from your chosen start date and time.
Enter your fasting details
Select the date and time your fast started, then choose whether to calculate from the current time or from a custom check-in time. The calculator will estimate your target end time and progress through the 36 hour fasting window.
Formula used:
Fast end time = start date and time + 36 hours
Hours completed = difference between check-in time and start time
Hours remaining = 36 − hours completed
Percentage complete = (hours completed ÷ 36) × 100
Milestones are shown at 12, 18, 24, and 36 hours after the start
Fast end time = start date and time + 36 hours
Hours completed = difference between check-in time and start time
Hours remaining = 36 − hours completed
Percentage complete = (hours completed ÷ 36) × 100
Milestones are shown at 12, 18, 24, and 36 hours after the start
Fast Ends At
—
Hours Completed
0.00
Hours Remaining
36.00
Progress
0.0%
Started
—
Check-In
—
Status
Pending
Total fast length
36 hours
Elapsed time
0 hours 0 minutes
Remaining time
36 hours 0 minutes
Timezone label
—
12 hour mark
—
18 hour mark
—
24 hour mark
—
36 hour mark
—
This calculator is a time-planning tool only. It does not replace medical advice, and longer fasts may not be appropriate for everyone.
Note: This tool is for informational and educational purposes only. Results are estimates and do not constitute professional advice. By using this calculator, you agree that Waldev is not liable for any errors or damages. Always verify results with official sources.
Full Disclaimer
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