Fetal kick counter

You don't need to be a mathematician to use a fetal kick counter. Get the number now, understand it by the time you reach the bottom of the page.

Every figure on this page can be reproduced by hand. That is why the full formula is printed below, variable by variable.

What it's for

For sound dating use a first ultrasound at 8–12 weeks — it beats LMP. Whether counting weeks from last menstrual period, tracking weight gain or tracking hCG in early pregnancy — the tool gives numbers it is possible to discuss with your OB-GYN. Typical visitors are users in Toronto, Vancouver, Montreal and Calgary comparing offers or checking a bill, so the worked examples below use sensible local values rather than abstract numbers.

Fetal kick counter turns dates and medical markers from a vague narrative into concrete weeks and expectations. Fetal kick counter turns those markers into numbers it is possible to keep an eye on, but it's no substitute for regular look over-ups. Use Fetal kick counter from week one to follow due date, week by week for expected baby development, at hCG blood tests (compare two figures for doubling time), for weekly weigh-ins, or for kick counts (from 28 weeks on).

The calculation, explained

Second: hCG figures vary enormously between women; trend matters, not the absolute figure. Third: gain isn't linear — first trimester typically 0.5–2 kg total, then 400–500 g/week.

Example: at first day of LMP 10 and cycle 37.5 days, Fetal kick counter computes the due date and current gestational age in weeks + days. Common: gestational age isn't the baby's age, it's weeks from the last period — actual age is ~2 weeks less. At hCG 100 mIU/mL today with a repeat test 48 hours later, doubling time 72h calls for a repeat ultrasound.

200–5000 mIU/mL at 5 weeks).

How to use it

For kick counts expect 10 movements within 2 hours — below that, call your midwife. Don't set side by side with friends — every pregnancy is different.

Average per IOM: 11.5–16 kg at normal BMI, 7–11.5 kg for overweight, 5–9 kg for obesity. Weigh yourself weekly on the same scale, morning, before breakfast.

This Fetal kick counter is tuned to practice in Canada: amounts are shown in Canadian dollar (CAD, C$), formatted as C$1,234.56, and quantities use metric with imperial habits (km, kg, °C, ft/in).

This is the part worth slowing down for.

Practical applications

• Units of gauge: Officially metric (km, kg, °C, L) but Imperial holdovers persist: heights in feet/inches, weights in pounds, oven temperatures regularly °F. Grocery pricing typically per 100 g.
• Electrical supply: 120 V / 60 Hz, Type A/B plugs (same as US).
• VAT / sales tax: Canada layers federal GST (5%) with provincial sales tax: HST (13–15%) in ON, NB, NL, NS, PE; separate PST/QST in BC, SK, MB, QC (5–9.975%). Alberta and territories charge only the 5% GST.
• Local notes: Amounts on this page use Canadian dollars and metric units, with provincial variation noted where it matters.
• Currency & format: Canadian dollar (CAD, $ or C$). Quebec uses comma as decimal (1 000,00 $), rest of Canada uses period.

When it makes sense to reach for this

A single measurement says little; comparing two 48 hours apart is far more informative. hCG in the first trimester doubles every 48–72 hours in a healthy pregnancy.

On an irregular cycle or imprecise LMP, a first ultrasound is the gold standard. Deviations >20% up or down warrant a consultation — but not panic.

Worth knowing before you rely on the result

Use the Canadian calculation tool between visits for peace of mind; for anything else, ask your OB-GYN. Canada mixes metric measurement with imperial habits, so Fetal kick counter is configure to match what people in fact quote here. Amounts on this page use Canadian dollars and metric units, with provincial variation noted where it matters.

Every figure above applies to Canada specifically and is reviewed when the rules change.

The usual errors

The normal range is wide (e.g. Standard formulas underpin it: due date = first day of last menstrual period + 280 days (Naegele's rule). Only 5% of babies arrive exactly on the due date; 90% arrive within ±2 weeks.

Weight gain per IOM: 11.5–16 kg at normal BMI.

Where this leaves you

Results like this one age quickly — the inputs move more often than the logic. Save the page, and the next recalculation takes seconds.