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Time and date calculators

Date difference and working days calculator

Calculate the date difference in days, weeks, months and years, plus working days, weekends and Polish holidays using the same dates.

Countdown to an event

Count down days, hours, minutes and seconds to a date. Free event countdown with an optional sound alarm.

Online stopwatch

Free online stopwatch with pause, resume and laps. Time workouts, study or work locally in your browser.

Online timer

Set a timer for hours, minutes and seconds. Pause, resume and a sound alarm without installing an app.

Pomodoro timer

A focus and break timer: 25 minutes of work, short breaks and a longer break after four sessions. Custom settings and sound alarm.

Work time calculator

Add working hours across multiple days, subtract breaks and include overnight shifts. Get clock and decimal-hour totals.

Add and subtract time

Add or subtract hours, minutes and seconds. Sum recording lengths and view totals in seconds and decimal hours.

Age calculator

Calculate age in years, months and days, and the time until the next birthday.

Add or subtract days from a date

Find the date a number of days before or after a starting date, including the weekday, without daylight-saving effects.

Calculators

Percentage calculator

Calculate a percentage of a number, a percentage share, an increase or decrease, and a discounted price. Free calculator with formulas.

Proportion calculator

Find the missing value in A:B=C:X or scale an ingredient to a different number of servings. Includes the formula and scale factor.

Average and grade calculator

Calculate a simple or weighted mean, median, sum and the next grade needed to reach a target. Enter values and optional weights.

Travel cost calculator

Estimate fuel and trip costs from distance, consumption and price. Add a return trip, extra charges and split costs between people.

Electricity usage calculator

Estimate energy use in kWh and operating costs for one or more devices. Enter power, usage time and your own electricity price.

Fuel consumption calculator

Calculate average consumption from distance and fuel used. Results in l/100 km, km/l, US MPG and UK MPG.

Tire size calculator

Compare two tire sizes: diameter, circumference, sidewall and percentage difference. See the theoretical change in speed indication.

Unit price calculator

Compare prices per kilogram, litre or item and find the cheapest offer.

Recipe portion calculator

Change the serving count and scale all ingredient quantities.

Paint calculator

Calculate paint quantity from surface area, coat count and coverage.

Tile and flooring calculator

Calculate packs of tiles or flooring, material reserve and optional cost.

Slope calculator

Calculate slope as a percentage and angle from rise and horizontal run.

Aspect ratio calculator

Calculate aspect ratio and new dimensions from a target width or height.

VAT calculator: net and gross

Calculate VAT and net or gross amounts. Enter an amount and choose the tax rate.

Compound interest calculator

Calculate future capital with regular contributions and see the effect of inflation.

FIRE calculator

Estimate capital for financial independence and time to reach it using your own assumptions.

Bill split calculator

Split a bill equally and add an optional tip. See exact payments with no missing cents.

Group expense calculator

Settle a party, trip or shared shopping. Enter what each person paid and see who needs to reimburse whom.

Unit converters

Length converter

Convert metres, centimetres, kilometres, inches, feet, yards and miles. Results update as you type.

Mass converter

Convert kilograms, grams, milligrams, tonnes, pounds, ounces and stone. See results in every supported mass unit.

Temperature converter

Convert Celsius, Fahrenheit and kelvin. Negative temperatures are supported down to absolute zero.

Volume converter

Convert litres, millilitres, cubic metres, gallons, pints and fluid ounces. US and UK units are shown separately.

Speed converter

Convert km/h, mph, m/s and knots. Compare speeds in metric and imperial units instantly.

Pressure converter

Convert pressure between Pa, kPa, bar and psi. Results update automatically when you change a value or unit.

Fuel economy converter: l/100 km and MPG

Convert l/100 km, km/l, US MPG, UK MPG and litres per 100 miles. See all results with clearly identified gallons.

Area converter: hectares, ares and mยฒ

Convert hectares, ares, square metres, acres and square feet. Results for nine area units.

Data size converter

Convert bits, bytes, kB, MB, GB and TB plus binary KiB, MiB, GiB and TiB.

Converters

Number base converter

Convert integers between binary, octal, decimal and hexadecimal.

JSON, CSV, TSV and NDJSON converter

Convert tabular data between JSON, CSV, TSV and NDJSON. Paste text or select a local file and download the result.

Image compressor to a target size

Resize a photo from your gallery and optionally compress it to a target file size. Everything runs locally in your browser.

Merge PDF online โ€” without uploading files

Combine PDF files into one. Set their order, merge locally in your browser and download the result. No account or document uploads.

Text tools

Character and word counter

Count words and characters with or without spaces. This free online counter updates as you type and processes your text locally in your browser.

Text comparison

Compare two versions of a text and identify added and removed lines. Your text stays in your browser.

Text cleaner and formatting remover

Remove document text formatting, convert HTML to plain text and clean spaces and lines.

Generators

QR code generator

Generate QR codes for Wi-Fi, contacts, events, email, SMS, locations, URLs and text. In your browser, with PNG/SVG downloads.

Barcode generator

Generate Code 128, EAN-13, EAN-8 and UPC-A in your browser. Check-digit validation and PNG/SVG downloads.

Random draws

Random number generator

Draw integers from a chosen range, with or without repeats. Set the limits and number of results.

Random name picker

Pick people from a list. Enter one participant per line and choose how many people to draw.

Random team generator

Split participants into random teams of balanced sizes. Enter a list of people and the number of teams.

Datasets

Polish localities โ€” GUS dataset

Full SIMC dataset of localities and their parts, identifiers and administrative divisions. Download CSV or JSON.

Polish license plate prefixes

Find county and province identifiers from official legislation. Download the dataset as CSV or JSON.

Document templates

Vehicle sale agreement generator

Prepare a private vehicle sale agreement under Polish law: preview, copy, TXT and print to PDF.

Residential lease agreement generator

Prepare an ordinary residential lease in Poland with rent, deposit and a handover record to complete.

Polish mandate agreement generator

Prepare an hourly mandate / service agreement with party details, scope, pay, preview and PDF.

Collision statement generator โ€” PDF

Prepare a collision statement online: drivers, vehicles, insurance and incident details. Preview, print or save as PDF. No registration.

Apartment handover record generator โ€” PDF

Prepare an apartment handover or return record: room condition, equipment, meters and keys. Free preview, TXT and print to PDF, without uploading details.

Payment receipt generator โ€” PDF

Generate a payment receipt with amount in words, payment purpose and recipient signature. PLN, preview, TXT and print to PDF. Details stay in your browser.

Mutual lease termination agreement โ€” PDF generator

Prepare a mutual residential lease termination: end date, return of the apartment, charges and deposit. Free generator with preview and print to PDF.

Letter to landlord generator

Report a fault or request a utility or deposit settlement. Complete the form in your language and create a Polish or bilingual letter.

Product complaint letter generator

Request repair or replacement of goods. Select the issue in your language and create a Polish or bilingual complaint to the seller.

School and nursery letter generator

Prepare an absence excuse, meeting request or child pickup authorization. Use a form in your language and create a Polish document with an optional second language.

Questions and answers

Are the tools free, and do I need an account?

All tools are free. No login, registration, app installation or contact details are required.

Is my input sent to a server?

Form contents and selected files are handled entirely by your browser. The tools do not send them to a server.

Are settings kept after refreshing the page?

Tool data stays in tab memory. It is never automatically saved in the address or for page refreshes. You choose what to include only when sharing a link. Opening a shared link restores its data, then removes the fragment from the current address. Recipients can read shared links; copies may remain in history or bookmarks. The theme preference is saved separately.

How can I copy or download a result?

The text cleaner lets you copy results or download a TXT file. QR and barcode generators offer PNG and SVG files. The date calculator and countdown let you copy a link with settings. Downloaded files are saved on your device; handle them according to their contents.

How should I interpret results and tool limits?

Each tool explains its rules next to the form. The date calculator uses Polish public holidays for working days, the converter distinguishes US and UK gallons, and text comparison highlights whole-line changes. Proportion and unit calculators display up to 12 significant digits. Details and limits are available on each toolโ€™s page.

Can I use the tools on my phone?

Yes, the tools are available in a browser on phones and computers, with light and dark themes. For timers and alarms, keep the tab open and the device awake: browser restrictions may delay sound.