Fetal Heart Rate Range Calculator
A normal baseline fetal heart rate is generally given as 110 to 160 beats per minute. This calculator converts a count of heartbeats over a timed window into beats per minute and compares the result to that reference band, flagging whether it falls below, within, or above the normal range. Counting over a longer window gives a steadier figure. The default bounds of 110 and 160 are editable so you can match the values your clinician uses. This is an arithmetic aid only, not a diagnostic tool, and home counts can be misleading.
Fetal heart rate formula
Beats per minute = beats counted / seconds * 60
Status = below if bpm < low, above if bpm > high, otherwise normal
Margin above low = bpm - low
Margin below high = high - bpm
The default normal band is 110 to 160 bpm, the standard reference for baseline fetal heart rate. A longer counting window reduces error in the converted rate.
Fetal heart rate context
- Normal baseline fetal heart rate is generally 110 to 160 beats per minute.
- Below 110 bpm is bradycardia; above 160 bpm is tachycardia.
- Rate is higher in early pregnancy and settles toward baseline as pregnancy advances.
- Home dopplers can detect the mother's pulse by mistake and are not reliable monitors.
- This tool performs arithmetic only and is not medical advice or a diagnosis.
Fetal heart rate: frequently asked questions
What is a normal fetal heart rate?
The widely used reference range for a normal baseline fetal heart rate is 110 to 160 beats per minute. A rate below 110 is called bradycardia and a rate above 160 is called tachycardia. This calculator uses 110 to 160 as the default normal band, which you can adjust if your clinician uses different bounds.
How do I convert counted beats to beats per minute?
Beats per minute equals the number of beats you counted divided by the number of seconds you counted over, multiplied by 60. For example, 27 beats counted over 10 seconds gives 27 divided by 10 times 60, which is 162 beats per minute.
How long should I count?
Counting over a longer window reduces error. A 6-second count multiplied by 10 is quick but coarse; a 15- or 30-second count gives a steadier figure. This calculator accepts any timing window in seconds, so a longer count yields a more reliable beats-per-minute value.
Can I rely on a home heartbeat count?
No. Home fetal dopplers and counts can mislead, sometimes detecting the mother's pulse or the placental blood flow instead of the baby. They do not replace professional monitoring. This calculator is an arithmetic aid only and is not a diagnostic tool or medical advice.
Does fetal heart rate change with gestational age?
Yes. The fetal heart rate is higher in early pregnancy and settles toward the 110 to 160 baseline range as pregnancy progresses. Brief accelerations and decelerations around the baseline are also normal during monitoring and are interpreted by clinicians in context.
Official sources
- U.S. National Library of Medicine, MedlinePlus: fetal monitoring and heart rate.
- U.S. Centers for Disease Control and Prevention: Maternal and Infant Health.
Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.