Contraction Timer
Time your contractions and track duration and frequency as labor progresses.
About this calculator
Tap Start contraction when one begins and End contraction when it stops. Each contraction is logged with its start time, duration, and time since the previous one started, so you can see duration and frequency trends at a glance. Entries are saved in your browser so a page refresh during labor won't lose your log.
Contractions are timed in two ways. Duration is how long each one lasts, from the start of the tightening to when it fades. Frequency is measured from the start of one contraction to the start of the next, not from the end of one to the start of the next, which is why the log shows the time since the previous contraction started.
Braxton Hicks, or practice contractions, are common in the second half of pregnancy. They tend to be irregular, don't get steadily closer together or stronger, and often ease with rest, a change of position, or drinking water. True labor contractions usually become longer, stronger, and closer together over time, whatever you do. If you're not sure which you're having, timing them for an hour or so often makes the difference clear, and your provider can help you decide when to come in.
Frequently asked questions
- When should I call my provider?
- A commonly used guide is the "5-1-1 rule": contractions about 5 minutes apart, lasting about 1 minute each, for at least an hour. Always follow your own provider's specific instructions over any general rule, and call sooner if anything feels wrong.
- Is this data saved anywhere?
- Your contraction log is saved only in your browser's local storage on this device, not on a server. Use Clear all to remove it once you no longer need it.
- When should I call right away, regardless of timing?
- Contact your provider or maternity unit promptly if your water breaks, if you have vaginal bleeding, if you notice reduced baby movement, if you have constant severe pain, or if you're having regular contractions before 37 weeks. Your provider may give you other specific reasons to call.