Online Tool Store
Contraction Timer
Time contractions and intervals, get an automatic pattern summary, a hedged 5-1-1 match indicator, a waters-broke log marker, and one-tap copy or print.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
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Tap when a contraction begins
Contractions (last hour)
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Average length
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Average interval
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Example pattern shown — start timing your own contraction above to replace it. Copy and print are disabled until you do, so example data is never mistaken for yours.
Log
How the Contraction Timer works
- Start the timer as each contraction begins and stop it when it eases; tap "Note: waters broke" to log that separately, any time.
- Let the summary build over an hour — a single contraction says nothing, the pattern is what matters.
- Watch for the 5-1-1 banner, which appears only once your own real data matches the pattern — not a countdown or a prediction.
- Read the average length and interval when calling your midwife or hospital, or copy or print the log straight from the page.
The method
Intervals are measured from the start of one contraction to the start of the next, not from the end of one to the beginning of the next.
interval = start of contraction N+1 - start of contraction N
The often-quoted 5-1-1 guide means contractions five minutes apart, lasting one minute, sustained for one hour — which only a pattern over time can show.
FAQ
When should I contact my midwife or hospital?
Follow the guidance you were given for your pregnancy, not a general rule. Contact them regardless of any pattern if your waters break, there is bleeding, or reduced movement — and if anything worries you at all.
Is the 5-1-1 rule reliable?
It is a common guide for a first labour, but plans differ by hospital, by pregnancy, and for anyone who has given birth before. Your own instructions override it.
What does the 5-1-1 banner mean when it appears?
It shows only once your own timed contractions match the commonly-cited pattern — roughly five minutes apart, a minute long, sustained for an hour. It describes your data; it is not an instruction or a diagnosis, and calling your midwife or hospital should follow your own guidance regardless of whether it appears.
What does the "waters broke" button do?
It adds a timestamped note to your log so you have it on hand when you call, without affecting contraction timing or the averages.
Can I save, copy, or print my log?
"Copy summary" copies the pattern and full log as text, and "Print log" opens your browser's print dialog. Both are disabled until you log a real contraction, so the example pattern shown on load is never mistaken for yours.
Is my data stored anywhere?
No. Timing stays in this page and is not transmitted, so keep a written note, copy, or printout if you need the log to survive closing the tab.
How we compare
| Feature | Online Tool Store | contractiontimer.org | contractionstimer.com | A paper log |
|---|---|---|---|---|
| Automatic average duration, interval & count | ✓ | Not stated | ✓ | Manual, error-prone |
| 5-1-1 guideline match indicator | ✓ | Explains the rule, no auto-detect | Explains the rule, no auto-detect | ✗ |
| Waters-broke event marker | ✓ | Not stated | ✓ | ✓ |
| Copy or print the log | ✓ | ✓ (PDF, image & share too) | ✓ | ✓ |
| Medical advice | ✗ | ✗ | ✗ | ✗ |
Contraction Timer records the pattern in the form you will be asked for, flags a 5-1-1 match automatically instead of leaving the math to you, and it is still not medical advice — your own maternity guidance always comes first.