Not Another Twin Calculator
Dual Calculator
Two clean calculators side-by-side, so you can compare numbers, transfer results between panels, and keep moving. No clutter, no unnecessary features.
$1.99
Dual Calculator
Two clean calculators side-by-side, so you can compare numbers, transfer results between panels, and keep moving. No clutter, no unnecessary features.
$1.99
Calculate your share on one side, your friend's on the other. No switching back and forth.
Unit price on the left, total on the right. See which deal is actually better.
Original measurement on one side, converted value on the other.
Do the same calculation twice. Make sure you got it right.
One tap moves results between calculators. No copy-paste needed.
Each calculator keeps its own calculation history.
Add, subtract, multiply, divide. The essentials, done right.
iPhone, iPad, Mac, and Apple Vision. One purchase, all devices.
Share with up to 6 family members at no extra cost.
No data collection. No accounts. Just math.
"Most calculators keep adding 'features' that slow you down. This one stays focused: quick, readable, and practical."
Twin pregnancy due-date calculator
Twin pregnancies typically deliver 2-3 weeks earlier than singletons. The app applies ACOG (American College of Obstetricians and Gynecologists) guidance: 36-37 weeks for di-di twins, 34-37 weeks for mo-di twins, 32-34 weeks for mo-mo twins.
Both. LMP (last menstrual period) follows the standard +280 days minus 14 to convert. Conception is +266 days. Twin offset applied after.
No. Not Another Twin Calculator is an informational tool only. Always consult your obstetrician for actual delivery planning. Twin pregnancies have many variables this calculator can't predict.
Date format follows your iOS region. To force MM/dd/yyyy or dd/MM/yyyy, change iOS Settings → General → Language & Region.
Get Not Another Twin Calculator for just $1.99. No subscriptions, no ads.