Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Baby Feeding Amount Calculator (per Feeding)

Estimate how much milk a formula-fed baby needs per feeding from body weight, feeds per day, and the standard daily intake per kilogram — in millilitres or ounces.

Baby's weight (kg)

Daily intake per kg of body weight (ml/kg/day)

Number of feedings per day (feeds)

Output unit

Amount per feeding

75 ml or oz

Pregnancy

Due Date Calculator (Naegele's Rule)

Estimate your due date from your last menstrual period using Naegele's rule, adjusted for your actual cycle length and luteal phase so a non-28-day cycle isn't misdated.

Days since first day of last period (LMP) (days)

Average menstrual cycle length (days)

Luteal phase length (days)

Days until estimated due date

224 days

At or past dueThird trimesterSecond trimesterFirst trimester

More than 189 days until your due date puts you in the first trimester (under ~13 weeks), the window covering the dating ultrasound and initial prenatal visit.

Counts calendar days until your estimated due date using Naegele's rule (266 days from conception), so each band corresponds to a pregnancy trimester window.

Key differences

	Baby Feeding Amount Calculator (per Feeding)	Due Date Calculator (Naegele's Rule)
Category	Pregnancy	Pregnancy
Inputs required	4	3
Result	Amount per feeding (ml or oz)	Days until estimated due date (days)
What it does	Estimate how much milk a formula-fed baby needs per feeding from body weight, feeds per day, and the standard daily intake per kilogram — in millilitres or ounces.	Estimate your due date from your last menstrual period using Naegele's rule, adjusted for your actual cycle length and luteal phase so a non-28-day cycle isn't misdated.