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Parenting & Family

Browse all 7 parenting & family tools

What is parenting calculators?

Parenting and family calculators cover the dates and figures that come with raising a family, from estimating a due date and tracking a pregnancy week by week, to the support and budgeting arithmetic that can follow.

Alimony Calculator

Estimate monthly spousal support using income disparity and marriage length. Educational use only.

alimony calculatorspousal supportalimony formula
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Baby Name Generator

Generate random baby name ideas filtered by gender and cultural origin.

baby name generatorbaby namesname ideas
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Child Support Calculator

Estimate child support using the Income Shares Model based on both parents' incomes.

child support calculatorchild support paymentsincome shares model
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Chore Chart Template

Build a chore chart that rotates automatically and shows how many turns each person gets.

chore chart templatechore chartfamily chore chart template
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Gestational Age Calculator

Calculate gestational age from your LMP. See due date, trimester, and milestones.

gestational age calculatorpregnancy weeksnaegeles rule
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Ovulation Calculator

Find your ovulation day and fertile window from last period date and cycle length.

ovulation calculatorfertile window calculatorovulation day
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Pregnancy Due Date Calculator

Calculate your due date from LMP or conception. See week-by-week progress and milestones.

pregnancy due datedue date calculatorpregnancy weeks
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Formula & Methodology

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Did you know? The Naegele rule behind nearly every due date calculator dates from 1812 and simply adds 280 days to the first day of the last menstrual period. Only about 4% of babies arrive on that exact date, which is why clinicians treat it as the middle of a range.

Sources

  • American College of Obstetricians and Gynecologists (ACOG): Methods for estimating the due date
  • Office of Child Support Services (U.S. HHS): State child support guideline models

Frequently Asked Questions

The standard method adds 280 days to the first day of your last menstrual period, assuming a 28-day cycle. The Pregnancy Due Date Calculator adjusts for a different cycle length, and an early ultrasound remains the more accurate estimate.

Roughly 4% of births happen on the estimated date. Most arrive within two weeks either side of it, so treat the date as the centre of a window rather than an appointment.

Most US states use either an income shares model or a percentage of obligor income, adjusted for custody nights, health insurance and childcare. The Child Support Calculator estimates a figure, but the court order is what binds.

The fertile window is roughly the five days before ovulation plus the day of ovulation itself. The Ovulation Calculator estimates it from your cycle length and last period.