What the days until due date tool does
A simple countdown to the big day. The answer appears the moment the page loads, and it recalculates as soon as you change an input — there is no submit button, no sign-up and no waiting. Everything runs locally in your browser, which is why the result is instant and why none of the values you type are ever transmitted.
Pregnancy is tracked in weeks, but life is organised in dates. Converting between the two — due date, current week, trimester boundaries, days remaining — is something expectant parents do constantly when booking appointments, planning leave and preparing at home.
How the calculation works
Standard dating counts forty weeks from the first day of the last menstrual period, which is the method used here. From that anchor the calculator derives the estimated due date, the current gestational week and the time remaining.
An estimated due date is exactly that: only a small minority of babies arrive on it, and a dating scan may shift the estimate. This tool is for information and planning and is not a substitute for advice from a midwife or doctor.
Getting the most out of it
A few practical notes make this pregnancy tool more useful in everyday situations:
- If a scan has given you a revised due date, work back forty weeks and use that date as your input.
- Trimester boundaries are conventionally set at weeks 13 and 27.
- The related pregnancy calculators below cover due dates, weeks and countdowns from the same information.
Common questions people bring to this page
Visitors usually arrive here with a very specific question — the exact figure shown in the result box. Once they have it, the follow-up is almost always about context: what the date falls on, how the number looks in a different unit, or how it compares with another period. The breakdown under the result and the related calculators at the bottom of the page are there for precisely those follow-ups, so you rarely need to open a second tool.
If a figure looks surprising, it is usually down to one of three things: which endpoint is included in the count, whether weekends and holidays are excluded, or the time zone your device is set to. Each of those is explained above, and adjusting the input accordingly will reconcile the number with whatever you are comparing it against.
Accuracy, privacy and cost
TimeQuick calculators are free, unlimited and require no account. Because the arithmetic happens in your browser rather than on a server, results are available offline once the page has loaded, and the dates you enter — including birth dates and pregnancy dates — stay on your device.
Every page is mobile-first: large type, tappable inputs and a result box that stays readable on a small screen. If you spot a figure you believe is wrong, check the assumptions listed above first, since most differences come from a different counting convention rather than a calculation error.