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Pick the right tool in seconds. Everything here is free, runs in your browser and is written for everyone, not only for people who work with computers.

21 tools

Dates & calendars

Count days, add business days with public holidays, find Easter or the week number.

Business days calculatorCount working days between two dates, or add business days, with public holidays for your country.Date calculatorDays between two dates, add or subtract days, months and years, and find the week number.Easter datesWestern and Orthodox Easter for any year, with Lent, Palm Sunday and Pentecost.Days untilHow many days until Christmas, Halloween, Thanksgiving, Easter or any date, with working days left and the weekday.Age calculatorExact age in years, months and days, total weeks and days, the weekday you were born and your next birthday.

Work & hours

Add up hours worked, convert hours and minutes, work out overtime pay.

Hours worked & time cardAdd start and end times, breaks and days into a weekly total, in hours:minutes and decimals.Overtime calculatorWork out overtime hours and pay from your hourly rate, threshold and premium.Hours & minutes to decimalConvert hh:mm to decimal hours and back, and find the time between two clock times.Time duration calculatorTime between two dates and times in days, hours, minutes and seconds, add up h:m:s durations, add time to a clock time.

Money & percentages

Work out percentages and discounts, add or remove VAT, see the monthly payment and the full schedule of a loan or mortgage.

Percentage calculatorFind X% of a number, what percent one number is of another, the percentage change, and add or subtract a percentage.VAT calculatorAdd VAT to a net price or take VAT out of a gross price, with UK, Italian and Romanian rates or any rate you choose.Loan & mortgage calculatorMonthly payment, total interest and full amortization schedule for a loan or mortgage, with CSV download.Discount calculatorSale price, percent off and original price, with stacked discounts and sales tax.

Health & body

Body mass index with the WHO bands, and an estimate of the calories you burn each day.

BMI calculatorBody mass index for adults in kg/cm or lb/ft, with the WHO categories and your healthy weight range.Calorie calculatorDaily calories to maintain, lose or gain weight, from your BMR (Mifflin-St Jeor or Katch-McArdle) and activity level.

Measures & numbers

Convert centimetres and inches, measure square metres and square feet, encode Base64, draw random numbers.

Cm to inches converterConvert centimeters to inches and back, plus mm, m, feet and inches, yards and miles, with tape-measure fractions.Square footage calculatorArea of a room, floor or wall in square feet and square meters, for any shape, with waste and cost of materials.Base64 decode and encodeEncode text or files to Base64 and decode Base64 back, with URL-safe mode, data URLs and clear error messages. Runs in your browser.Random number generatorRandom numbers in any range, with or without repeats, integers or decimals, drawn with your browser's cryptographic generator.

School & study

Calculate your GPA or grade average and the grades you need to reach a target.

GPA & grade average calculatorGPA on the 4.0 scale, Italian weighted average with CFU, 1–10 averages, and the grade you need.

Files & viewers

Open and inspect files right in your browser, without uploading them.

HTML viewerOpen an HTML or SVG file, or paste code, and see it as a web page, safely and without uploading.

Made for everyday questions

Free for everyone

No account, no payment, no trial period. Open a page and use it. The tools are explained in plain words, for office staff, shop owners, students and freelancers alike.

Private by design

Calculations run in your browser. The dates, hours and amounts you type are not sent to our servers; the only place they can be saved is your own device, and only if you ask.

Explained, not just answered

Every tool shows the rule behind the result, with worked examples, so you can check the answer and trust it.

Questions about this site

Is it really free?

Yes. Every tool is free to use, without an account or a trial period. The site may show advertising in the future to cover its costs, but never in a way that blocks a tool.

Do you store what I type?

No. The calculations run in your browser and the numbers you enter are not sent to us. Some tools can remember your last settings on your own device, and you can clear them at any time.

Which countries' public holidays are included?

Italy, Romania, the United States (federal), the United Kingdom (England), Germany (nationwide holidays), France and Spain (nationwide holidays). Movable feasts such as Easter are calculated, not copied from a table. Regional days can be added by hand.

Can I trust the results?

The calculation rules are published on each page and tested against known values. For legal, payroll or religious decisions, always check the official source for your case: these tools help you work things out, they do not replace professional advice.