Log each contraction and spot timing patterns. See averages, shortest gaps, and duration changes instantly. Download reports and charts for organized birth preparation notes.
Use this tool to log contraction start and end times, compare frequency, review duration trends, and keep a clean exportable record for your birth planning notes.
| # | Start Time | End Time | Duration | Interval Since Previous Start |
|---|---|---|---|---|
| 1 | 07:00:00 | 07:00:45 | 00:45 | - |
| 2 | 07:08:00 | 07:08:55 | 00:55 | 08:00 |
| 3 | 07:15:00 | 07:16:05 | 01:05 | 07:00 |
| 4 | 07:21:00 | 07:22:10 | 01:10 | 06:00 |
Contraction Duration = End Time − Start Time
Interval Between Contractions = Current Start Time − Previous Start Time
Average Duration = Sum of all durations ÷ Number of contractions
Average Interval = Sum of all intervals ÷ Number of intervals
Frequency Per Hour = 3600 ÷ Average interval in seconds
Recent Trend Check compares your chosen number of latest contractions against the alert thresholds you set in the form.
It measures contraction duration, time between contraction starts, average timing, recent trend changes, and estimated contraction frequency per hour from your logged entries.
Start and end times are needed to calculate each contraction’s duration accurately. Duration helps you compare whether contractions are becoming longer over time.
The interval is the time from one contraction’s start to the next contraction’s start. This is often more useful for pattern tracking than end-to-start timing.
Yes. The calculator automatically handles end times that pass midnight and also normalizes later entries when the next start time occurs after a date rollover.
It reviews the most recent contractions you choose and compares their average interval and average duration against your selected alert thresholds.
No. It helps organize timing data only. Follow the instructions from your clinician, midwife, or birth team for decisions about when to call or go in.
They include the logged contraction table and your key summary results, making it easier to keep records or share a clean snapshot with someone assisting you.
The chart makes it easier to see whether contraction durations are rising, intervals are shortening, or the pattern is staying irregular across the logged sequence.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.