Best free date calculators in 2026

"How many days between two dates?" sounds like a simple question, but counting it by hand is easy to get wrong. Leap years, months of different lengths, and the awkward choice of whether to include the start day or the end day all trip people up. That is why so many of us reach for a date duration calculator, whether it is to work out a project deadline, count the days until a wedding, price a hotel stay, or check how long is left on a contract. We tested five free date calculators against the same real tasks, looking at accuracy, the options they give you, and how cluttered the experience is. This guide covers the best free options for "date calculator between dates", "days between dates calculator", and the everyday "date duration calculator" search.

How we tested

We ran the same set of tasks through each tool: counting the days between two ordinary dates, a range that crossed a leap year (February 2024), adding 90 days to a start date, and working out the number of business days across a fortnight. For each tool we checked whether the result was correct, whether it offered a years, months, and days breakdown, whether it let us choose between inclusive and exclusive counting, and whether a business-days mode was available. We also noted how many ads and how much clutter sat around the answer, and whether the tool needed an account.

The full ranking

Side by side

Inclusive versus exclusive counting

The single biggest source of confusion with date calculators is whether the count includes both end dates or just the gap between them. Say you are counting from the 1st to the 5th. Exclusive counting gives 4 days, which is the number of nights in a hotel or the number of full days that pass. Inclusive counting gives 5 days, which is what you want when both the first and last day count, such as billing a five-day event or counting notice periods. Neither is wrong, they answer different questions, so the useful thing is a tool that lets you switch.

Days between, or days from now?

These are two different jobs and it helps to know which one you need before you start.

Counting the gap between two known dates

This is the classic "how many days between two dates" task: you have a start and an end, and you want the number of days, weeks, or the years, months, and days in between. Every tool here can do this, and the good ones handle leap years automatically so a range crossing February 2024 counts the extra day for you without any effort.

Adding or subtracting days from a start date

Here you know one date and a number of days, and you want the resulting date. This is how you find a deadline 90 days out, a return date, or a past date a set number of days ago. ToolHub and Calculator.net keep this alongside the days-between tool, so you can flip between the two without changing pages, while several other tools split it onto a separate calculator.

Why business days matter

Calendar days and working days are not the same, and for anything tied to a workplace the difference adds up quickly. A 14-day calendar window is only about 10 business days once you remove weekends, which changes delivery estimates, payment terms, and turnaround promises. A calculator that reports business days as well as calendar days saves you from counting weekends off by hand. Public holidays are the remaining wrinkle, since they vary by country and are the one thing most free tools do not remove automatically.

Common questions

What is the best free date calculator?

For most people the best free option is one that covers both counting days between dates and adding or subtracting days, without ads getting in the way. ToolHub does both on one screen, adds a years, months, and days breakdown, an inclusive or exclusive toggle, and a business-days count, and it runs in your browser. TimeAndDate.com and Calculator.net are strong, well-established alternatives if you prefer a familiar name.

How do I count the number of days between two dates?

Enter your start date and end date into a date duration calculator and it returns the total. The one decision to make is inclusive versus exclusive counting: exclusive gives the gap between the two dates, while inclusive counts both the first and last day. If you count by hand instead, remember that months vary in length and that a leap year adds a day in February, both of which a good calculator handles for you.

Does the count include both the start and end date?

That depends on the setting. By default many tools count exclusively, giving the number of full days between the two dates. If you need both endpoints counted, look for an "include end day" or inclusive option, which adds one to the total. ToolHub exposes this as a single toggle so you can see both answers without recalculating.

How do I add or subtract days from a date?

Use the add or subtract mode of a date calculator: enter a start date, type the number of days, and choose to add or subtract. The tool returns the resulting calendar date and handles month boundaries and leap years for you. ToolHub and Calculator.net keep this next to the days-between tool, so you can move between the two tasks without leaving the page.

Do these tools count business days?

Some do. ToolHub, Calculator.net, and Gigacalculator can report working days by excluding weekends, which is what you want for delivery windows and payment terms. Public holidays are harder, since they differ by country, so most free tools leave those for you to account for. Always check whether a business-days figure excludes only weekends or holidays too.

Do I need an account to use these calculators?

No. None of the tools in this comparison require an account for basic date math. They all run in the browser, so your dates are not being submitted anywhere sensitive. The main differences come down to how many features sit on one page and how many ads surround the answer. ToolHub needs no account and shows no ads.

Final word

Counting days between two dates is simple math that a browser can do instantly, so the deciding factors are really how many of the related jobs a tool covers and how clean the experience is. ToolHub is the pick for most people because it counts days between dates, adds and subtracts from a start date, breaks the result into years, months, and days, toggles inclusive or exclusive counting, and reports business days, all on one ad-free screen. TimeAndDate.com and Calculator.net are reliable classics if you want a familiar name, and Gigacalculator is fine for a quick plain count. For an everyday date duration calculator that just answers the question, keep it simple and keep it in your browser.