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Free Browser Utilities

Every utility here is a plain, focused calculator that runs entirely in your browser. Pick the question you need to answer, enter a few values and read the result straight away. There is no account, no paywall and no waiting in a queue.

Every calculation runs in your browser. The dates, times and hours you enter are never sent to a server, saved to a cookie or stored in your browser.

Browse by category

  • Date & Time Calculators

    Choose a focused date or work-time calculator: count days between dates, add or subtract days, or total work hours. Free and browser-based.

All utilities

  • Add or Subtract Days

    Work out which date falls a chosen number of days before or after another date.

  • Work Hours Calculator

    Total your working hours for a week, including breaks, and compare them with a target.

Utilities questions

Are these utilities free to use?
Yes. Every calculator in this family is free, with no account, no trial period and no limit on how many calculations you run.
Do the dates and times I enter leave my device?
No. The calculations are performed by JavaScript in your browser. The values you type are not sent to a server, saved in local storage or attached to a profile.
How accurate are the results?
Date results come from arithmetic on whole calendar days, so leap years and month lengths are handled exactly and the same inputs always give the same outputs. Work-hours results are additions of the times you enter and are shown to the minute.
What does the Utilities family cover today?
The current release covers date and time questions: counting days between two dates, adding or subtracting days and totalling weekly work hours. Each calculator page describes its method and limitations so you can check that it fits your case.