Pregnancy, Baby & Family

Estimate your ovulation day and most fertile days from the first day of your last period and your cycle length — for the next three cycles.

Predict your next six periods from the start of your last period, cycle length and period length.

Work backwards from a due date (or last period) to find the likely conception date and the fertile window when conception probably happened.

Calculate hCG doubling time and the percentage rise between two blood test results taken hours or days apart in early pregnancy.

See the recommended total pregnancy weight gain and weekly rate for your pre-pregnancy BMI, for single or twin pregnancies (IOM 2009 guidelines).

Estimate the chances of your baby having brown, green or blue eyes from both parents' eye colors, using a simplified genetics model.

Estimate a child's adult height from the parents' heights with the mid-parental height method, including the typical range.

Estimate how much formula a baby needs per day and per feed from their weight and age — using the common 2.5 oz per pound guideline.

Recommended total sleep, typical naps and awake (wake) windows for babies, toddlers and children by age.

Estimate how many diapers a baby uses and what they cost per month, per year and until potty training.

Compare the yearly cost of daycare, a nanny (with employer taxes) and a nanny share — and see child care as a share of household income.

Suggest a weekly allowance by age and see what it adds up to per month and year — with a save/spend/give split.

Recommended screen time limits for children by age from the American Academy of Pediatrics and WHO, with practical tips.

Find the right car seat stage — rear-facing, forward-facing harness, booster or seat belt — from your child's age, height and weight, following AAP guidance.

Find which school grade or year a child will be in, based on their birthdate and your area's kindergarten age cutoff date.

Convert your dog's or cat's age into human years — by size for dogs — using veterinary guidelines and the 2020 DNA-methylation formula.

Estimate how many calories your dog or cat needs per day — and how many cups of their food — from weight, age and activity, using veterinary RER/MER formulas.

Build a co-parenting custody calendar from common schedules — alternating weeks, 2-2-3, 2-2-5-5, 3-4-4-3 or every other weekend — and see each parent's share of overnights.

Make a printable weekly chore chart with age-appropriate chores for each child — from toddlers putting toys away to teens doing laundry.

Find baby name ideas for girls, boys or gender-neutral — filtered by origin (English, Irish, Italian, Spanish, Arabic, Indian, Japanese and more) and starting letter.

Typical children's shoe sizes by age — US, UK and EU sizes with foot length — from newborn to 12 years, plus how to measure your child's foot.

Estimate your baby's due date from the first day of your last period, the conception date or an IVF transfer date — and see how many weeks pregnant you are.