A few months ago my partner and I found out we were expecting. Like anyone in that situation, I immediately started counting weeks. “How many weeks are we at right now?” “What date is 34 weeks from now?” “How many weeks until the third trimester?” The usual spiral.
I’d pull up a calendar, count days on my fingers, then try to divide by seven in my head. Or I’d search for a “weeks calculator” and get thrown into some bloated form with sliders, ads, and confusing outputs like “2.43 weeks.” Nobody wants 2.43 weeks. You want “2 weeks and 5 days.”
There are plenty of date calculators out there. Most give you the total number of days, or a decimal number of weeks. That’s technically correct, but it’s not how humans think. When you’re tracking a pregnancy, a project phase, or even just “how long until my vacation,” you think in whole weeks plus leftover days.
And the tools that do show weeks and days? They’re often buried inside pregnancy apps or project management software — you have to sign up, create a project, or wade through a dozen features. I don’t want an app. I want a page. I want to type two dates and get a clear answer.
So I built exactly that.
Pick a start date and an end date. It instantly shows the number of full weeks plus any leftover days. That’s it. No login, no extra fields, no interpretation needed.
The Weeks Between Dates Calculator does one thing and does it plainly: tell you “14 weeks and 3 days” or “0 weeks and 6 days.” It’s useful for pregnancy windows, sprint planning, countdowns to a wedding, or just settling a bet about how long ago something happened.
Try the Weeks Between Dates Calculator →
I made it for myself first, but I think it’s worth sharing because it’s the kind of thing that should already exist without all the extra noise. No tracking, no newsletter prompt, no “unlock pro features.” Just a simple tool that does the math right.