Days Calculator – Count Days Between Two Dates Online

This free days calculator counts the exact number of days, months, and years between two dates. Choose a start and end date, optionally include the end date, and see the result in plain language—no signup, no upload, all in your browser.

What Is a Days Calculator?

A days calculator is a date tool that measures the time span between two calendar dates. It returns the total number of days and also breaks the duration into years, months, and days, so you can see how long a project, trip, contract, or event lasts. It is useful for planning, billing, scheduling, and any task where exact dates matter.

How to Use This Days Calculator?

Pick a start date and an end date using the two date fields. If you want today as your end date, click the "Set to Today" button. Optionally tick "Include end date" to add one day to the total. Click "Calculate Duration" to see the result, which appears in a highlighted card with the total days, a plain-language summary, and breakdowns into years/months/days and months/days.

Why Use Our Days Calculator?

Our days calculator runs entirely in your browser, so your dates stay private. It is completely free, requires no account, and works on desktop and mobile. It handles calendar quirks like varying month lengths and leap years correctly, and it shows multiple interpretations of the same span so you can pick the one that fits your use case.

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Frequently Asked Questions

Is this days calculator free?

Yes, it is completely free to use with no hidden charges, limits, or premium tiers.

Does it work offline?

Yes, once the page is loaded in your browser, the calculator works without an internet connection.

Is my data safe?

Absolutely. All date calculations happen locally in your browser, so the dates you enter are never sent to any server.

Do I need to create an account?

No account or signup is required. Just open the page, pick two dates, and calculate.