Fetal Heart Rate Reference
The 110–160 bpm band, how it changes by week — and the heartbeat gender myth measured against data.
The rate arcs through pregnancy: ~110 at six weeks, peaking ~170 around week 9–10, settling to the famous 110–160 band. The 'fast = girl' folklore was tested on thousands of scans — no measurable difference between sexes. A single reading also wobbles with sleep cycles and movement; patterns over time carry the meaning.
Formula
For general information only. Pregnancy and infant care decisions must be guided by your treating clinician or midwife — always defer to their assessment.
The 110–160 bpm band, how it changes by week — and the heartbeat gender myth measured against data. The Fetal Heart Rate Reference is a free, private fetal heart rate tool — every result computes instantly in your browser with no sign-up and no data upload.
About Fetal Heart Rate Reference
The rate arcs through pregnancy: ~110 at six weeks, peaking ~170 around week 9–10, settling to the famous 110–160 band. It applies normal baseline after T1 = 110–160 bpm (FIGO). Use the Fetal Heart Rate Reference to get an instant, clearly-explained result with the working shown step by step — free, private and with the source method cited.
How to use Fetal Heart Rate Reference
- 1Enter your details in the Fetal Heart Rate Reference input fields above.
- 2The result updates instantly with the working and reference bands shown.
- 3Adjust any value to explore how it changes the outcome — it's free and unlimited.
Why use Fetal Heart Rate Reference?
- ✓Instant fetal heart rate result that recomputes as you type — no waiting, no page reloads
- ✓100% client-side: your health data never leaves your browser
- ✓Shows the actual formula and your numbers substituted in, so you can see exactly how the result is reached
- ✓Based on published, citable sources (FIGO consensus — intrapartum fetal monitoring 2015)
- ✓Free forever with no sign-up, account or app install
Frequently asked questions
How does the Fetal Heart Rate Reference work?+
The rate arcs through pregnancy: ~110 at six weeks, peaking ~170 around week 9–10, settling to the famous 110–160 band. The calculation uses the formula: normal baseline after T1 = 110–160 bpm (FIGO). Everything runs instantly in your browser as you type — your inputs are never uploaded.
Is the Fetal Heart Rate Reference accurate, and what is it based on?+
The method is traceable to authoritative sources, including FIGO consensus — intrapartum fetal monitoring 2015; McKenna DS et al., Fetal Diagn Ther 2006 — FHR and fetal sex. Results are estimates — individual variation always applies, so treat the output as a well-grounded starting point.
Is the Fetal Heart Rate Reference free and private?+
Yes. It's completely free with no sign-up, and all computation happens locally in your browser, so none of your health data ever leaves your device.
Can I use this for medical decisions?+
This tool is informational only. Always defer to your treating clinician or midwife for pregnancy and infant care decisions.
What can I use the Fetal Heart Rate Reference for?+
It's commonly used for fetal heart rate, baby heartbeat normal, fhr by week. The 110–160 bpm band, how it changes by week — and the heartbeat gender myth measured against data.
Related Health tools
Adult BMI Calculator (WHO)
Body-mass index for adults with the WHO reference bands shown neutrally, plus the substituted formula step by step.
● LiveBMI Calculator (lb & inches)
US-style BMI from pounds and inches using the ×703 conversion, with CDC adult reference ranges.
● LiveBMI Calculator for Women
BMI with reference context written for women — what the index can and cannot say about female body composition.
● Live