Log Contractions
Use the live timer for quick capture, or type entries manually for detailed analysis.
Ending a live timer fills the next empty row with the current start time and measured duration.
Example Data Table
| Entry | Start Time | Duration (sec) | Interval (min) | Intensity |
|---|---|---|---|---|
| 1 | 08:00 | 35 | — | Mild |
| 2 | 08:09 | 42 | 9.00 | Mild |
| 3 | 08:17 | 48 | 8.00 | Moderate |
| 4 | 08:24 | 56 | 7.00 | Moderate |
| 5 | 08:30 | 63 | 6.00 | Strong |
Formula Used
Contraction Duration
Duration = end time − start time, measured in seconds.
Interval Between Contractions
Interval = current contraction start − previous contraction start, measured in minutes.
Average Interval
Average interval = sum of all intervals ÷ number of intervals.
Frequency Per Hour
Frequency = total contractions ÷ observation hours.
Regularity Score
Coefficient of variation = interval standard deviation ÷ average interval × 100.
How to Use This Calculator
- Start a contraction with the live timer, or manually enter its start time.
- Stop the timer when the contraction ends, or type the duration in seconds.
- Choose the intensity level and add notes about movement, hydration, pain location, or breathing effort.
- Repeat for several contractions so interval patterns become more useful and regularity can be estimated.
- Press Submit and Analyze to show the summary above the form, review the chart, and export results.
FAQs
1. What does this calculator measure?
It logs contraction start times, durations, spacing, intensity, and simple pattern statistics. It helps you review whether contractions are becoming longer, closer together, and more regular over time.
2. Does it tell me whether I am in labor?
No. It summarizes timing patterns only. Labor decisions should follow your clinician’s advice, your pregnancy history, and any urgent symptoms you are experiencing.
3. Why are intervals measured from start time to start time?
This method is commonly used because it keeps spacing consistent across entries. It shows how often contractions begin, regardless of how long each contraction lasts.
4. How many contractions should I log?
At least two are needed for interval data, but five or more usually give a clearer picture. More entries improve the regularity estimate and chart usefulness.
5. What does the regularity label mean?
It uses interval variation. Lower variation suggests a steadier pattern, while higher variation suggests contractions are less evenly spaced and may still be evolving.
6. Can I export my results?
Yes. After calculating, you can download a CSV for spreadsheet review or a PDF summary to share with a support person or keep for reference.
7. What notes should I record?
Useful notes include body position, hydration, back pain, pressure, bleeding, membrane rupture, or whether talking and walking became more difficult during the contraction.
8. When should I seek urgent help?
Seek urgent medical care for heavy bleeding, severe pain, reduced fetal movement, fainting, fever, or any emergency symptom. Timing alone should never override urgent warning signs.