At 3am a tightening wakes you, fades, and leaves you staring at the clock trying to remember when the last one started. What you write down in the next hour shapes every decision after it, because the person on the other end of the phone will not ask what it felt like. Learning how to time contractions properly takes two minutes and something to write with, and it turns a frightening hour into numbers you can read aloud.
Key takeaways
- Count from the start of one contraction to the start of the next, not from the end of one to the start of the next.
- Duration and frequency are separate numbers, and your provider will want both written down.
- True labor contractions get longer, stronger and closer together over an hour or two.
- Early labor can run ten hours or more before anything dramatic happens.
- Call your midwife when regular contractions come every five minutes or more often, or sooner if your waters break or you bleed.
What a contraction timer actually measures
Two numbers matter here, and they are easy to mix up. Duration is how long a single tightening lasts, from the moment the muscle hardens until it lets go. Frequency is how often they arrive, which you get by counting from the start of one contraction to the start of the next. Cleveland Clinic states the rule plainly: start counting from the beginning of one contraction to the beginning of the next, and do it in seconds.
The start-to-start convention matters because the gap you feel is not the number you report. A contraction lasting 60 seconds that arrives every five minutes leaves four minutes of rest in between, not five. Count end-to-start and you will tell a triage midwife the contractions are six minutes apart when the real figure is five, and you will be asked to start again.
How to time contractions step by step
Knowing how to time contractions is the easy part. Remembering the numbers at 3am is what fails. Cleveland Clinic suggests writing down the time each contraction begins and how many seconds it lasts, so the pattern sits on paper instead of in your memory.
- Note the clock time the moment the tightening starts.
- Stop the count when the muscle releases, and write the seconds down.
- Repeat for the next one, and keep the whole list in one place.
- Add a short note on what you were doing, because position and activity change the pattern.
A phone timer works, and so does a pen and the back of an envelope. What does not work is recall: by the fourth contraction most people genuinely cannot say whether the last one was four minutes ago or seven, and guessing produces a pattern that is not there. If someone is with you, hand them the job and let them keep the numbers while you focus on getting through each one.
The numbers, and why the sources disagree
Reliable sources do not agree on how long a contraction should last, and it helps to know that before you panic about a figure you found online. ACOG describes true labor contractions as lasting about 60 to 90 seconds each. Cleveland Clinic’s own pages give 40 to 60 seconds, then break it down by phase: 20 to 30 seconds in early labor, 40 to 70 seconds in active labor. Averaging them into one number would be a mistake, because they describe a process that changes hour by hour.
What every source agrees on is the trend. True labor contractions get longer, stronger and closer together, while false ones do not build. Cleveland Clinic adds that real contractions tend to hurt across the whole abdomen, sometimes into the lower back and legs, and become intense enough that walking or talking through one stops being possible.
None of those figures change how to time contractions. What they change is the number worth picking up the phone for.
The threshold for calling is a local rule rather than a universal law. NHS advice is to contact your midwife or maternity unit when you think you are in labor, and specifically when regular contractions come every five minutes or more often. Your own unit may have given you a different instruction at a prenatal appointment, and that one outranks anything on the internet, including this page.
Why the first hours tell you the least
The hard part of timing is emotional, because numbers feel like progress and early on they usually are not. The NHS calls the beginning the latent phase, when the cervix softens, thins and starts to open, and notes that it can take hours or sometimes days. Most people are advised to stay at home through it, and arriving at the hospital too early often ends with a suggestion to go back home.
A large Swedish study makes the scale concrete. Across 67,267 pregnancies, the median time from the first painful contractions to 5cm dilation was 16.0 hours for a first baby and 9.4 hours for people who had given birth before (Tilden et al., 2023). Half of all first labors took longer than that.
Cleveland Clinic’s stage figures point the same way. The first stage of labor runs 12 to 19 hours, with early labor alone taking 6 to 12 hours to reach about 6cm, and active labor a further 4 to 8 hours. ACOG puts a first labor at 12 to 18 hours overall. A slow, irregular hour at home is the shape of normal, not evidence that something has gone wrong.
What to note besides the clock
The timer is one input among several, and the rest are things only you can observe. ACOG separates true from false labor using four tests that need no stopwatch: whether contractions continue while you rest or move, whether they get stronger, where the pain sits, and whether resting and drinking water makes them stop. True labor pain usually starts in the back and moves to the front, while practice contractions are generally felt only at the front of the belly.
Back labor deserves its own note, since it is a common reason the timer looks strange. When pain settles in the lower back and stays there, contractions can feel continuous rather than separate, and the pattern is harder to read. ACOG’s answer for that situation is not to keep guessing at home, because constant severe pain with no relief between contractions is a reason to be seen.
When the timer stops being the question
Timing is a tool for the ambiguous early part of labor. It does not replace triage. Call your midwife or maternity unit urgently if your waters break, if you have vaginal bleeding, if your baby is moving less than usual, if you are less than 37 weeks and think labor has started, if any contraction lasts longer than two minutes, or if you have six or more contractions in ten minutes. At that point, how to time contractions matters far less than what you are actually seeing.
A strong urge to push with a feeling that the baby is coming now is an ambulance call, and the clock has nothing to do with it.
How Utun can help
Utun is our own pregnancy app, and its health tracker includes a contraction timer alongside a kick counter and a weight log, so the numbers you collect overnight sit in the same place as the rest of your pregnancy record. It also carries development information with daily guidance matched to how far along you are, a mood journal, and a hospital bag checklist for the third trimester. You can get it on Google Play and see the rest of our apps on the products page.
Do I count from the start or the end of a contraction?
Count from the start. The clinic’s guidance is to time from the beginning of one contraction to the beginning of the next, in seconds, and to record both the start time and the duration. Counting end-to-start stretches every gap by the length of a contraction.
How many contractions in an hour is normal?
There is no single normal number, because the count changes with the stage of labor. Cleveland Clinic describes early labor contractions as arriving every 30 to 60 minutes, and active labor contractions as arriving every three to five minutes. What matters clinically is whether those gaps are shrinking. The method for how to time contractions stays the same from the first hour to the last; only the spacing moves.
Should I go in at five minutes apart?
Five minutes is the NHS threshold for contacting your midwife, not a rule for being admitted. You will see a 5-1-1 rule quoted widely online, meaning five minutes apart, lasting a minute, for an hour, but none of the guidance cited here states it as a standard. Follow whatever your own unit told you.
What if the pain never stops between contractions?
Constant severe pain with no relief between contractions is on ACOG’s list of reasons to go to hospital. The NHS asks you to call urgently if a single contraction lasts longer than two minutes. Either way, you do not need a tidy pattern before you make the call.
This article is educational and is not medical advice. Talk to your midwife, doctor or maternity unit about your own labor and when they want to hear from you.
Featured image: “Stopwatch, 1810201155” by Ansgar Koreng via Wikimedia Commons, CC BY-SA 4.0.
Sources
- NHS. Signs that labour has begun. https://www.nhs.uk/pregnancy/labour-and-birth/signs-that-labour-has-begun/
- ACOG. How to Tell When Labor Begins. https://www.acog.org/womens-health/faqs/how-to-tell-when-labor-begins
- Cleveland Clinic. Contractions. https://my.clevelandclinic.org/health/symptoms/contractions
- Cleveland Clinic. Stages of Labor. https://my.clevelandclinic.org/health/body/22640-stages-of-labor
- Tilden EL, Caughey AB, Ahlberg M, Lundborg L, et al. Latent phase duration and associated outcomes: a contemporary, population-based observational study. American Journal of Obstetrics and Gynecology, 2023. https://pubmed.ncbi.nlm.nih.gov/37164487/
Related reading: Braxton Hicks vs real contractions, pregnancy week by week, hospital bag checklist, and more in pregnancy health.
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