Builders
FreeLegal Calculators
Read this first
These calculators do arithmetic on things that are written down and exact: dates, periods, ages, and interest at a rate you state. They are an educational tool, not legal advice, and they do not replace a lawyer.
They do not tell you what a court, an arbitrator or a mediator will decide, how long a case will take, what it will cost, or what a claim is worth, and we will not build calculators that pretend to. Nobody can honestly forecast those things in advance: evidence changes, new witnesses appear, parties are added, a case can be sent back to an earlier stage. Anyone who gives you an exact figure for the cost, the time or the outcome of a dispute before it has run is guessing, whether it is a website or a law firm.
Holidays to skip (optional)
Used by the working-day calculators and the weekend rule below. Public holidays differ by country and change from year to year, so you list the ones that matter to you.
No holidays listed: only Saturdays and Sundays are skipped.
1. Add or subtract a period from a date
The date a period ends, counting calendar days, weeks, months or years. The start day is not counted, and a month ending on a day that does not exist (31 January plus one month) ends on the last day of that month.
Thursday, 19 November 2026
14 days after Thursday, 5 November 2026.
2. Count working days from a date
The date after a number of working days, skipping Saturdays, Sundays and the holidays you listed.
Thursday, 19 November 2026
10 working days after Thursday, 5 November 2026; the start day itself is not counted. No holidays listed: only Saturdays and Sundays are skipped.
3. Days between two dates
How many calendar days and how many working days lie between two dates.
Enter two dates.
4. Age on a date, and the day an age is reached
How old someone is on a given date, and the date they reach an age such as 18 or 21. Which age matters for what differs by country; see the legal ages guide.
Enter a date of birth.
5. Interest on a sum at a rate you state
Plain arithmetic: simple interest, or interest compounded a number of times a year, for a number of days. The rate is yours to enter; where a statute or a contract sets the rate, take it from there.
Interest: 800.00 Total: 10,800.00
10,000.00 at 8% a year for 365 days on a 365-day year, simple interest. The rate is the one you typed: this page does not know which rate, if any, a law, a contract or a court order sets for your case.
6. A fixed time limit written in a statute
Only periods that are a single number in a statute. Choose the rule, enter the date from which it runs, and read the source and the warning that come with the answer.
Source: Limitation Act 1980, section 5. These periods are written from the rule as we understand it in November 2026, not checked line by line against the current official text; laws change, so read the source and confirm it before relying on a date.
Enter the date from which the period runs.
Why there is no damages, fee or divorce calculator
Because their answers depend on a judge, a negotiation or facts nobody knows yet: damages, legal costs and contingency fees, how a divorce or an estate is divided, custody, settlement values, and how long any of it takes. A calculator that shows one number for these gives a false sense of certainty, and people have been misled by exactly that. Where the law itself fixes the number, we show it with its source; where it does not, we say so.
Related free guides: Legal ages around the world, Law by country, comparative law tools.
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Free to use in class. The free parts open for everyone, no account needed.