Shoe Size Converter — EU / UK / US / cm
Convert shoe size between EU, UK, US and centimetres. Women and men footwear. Free shoe size and foot length converter.
Unit Converters
Unit converters are essential tools for everyday calculations — from length and mass to temperature, volume, speed, digital data, area and clothing sizes. Whether you work with the SI system, imperial units or international clothing standards, you will find a fast and accurate converter here. Pick a calculator below.
Clothing Size Converter — S/M/L, EU/UK/US
Convert clothing size from chest circumference. Letter size S/M/L/XL plus EU, UK, US. Free clothing size converter.
Temperature converter — Celsius, Fahrenheit, Kelvin
Convert temperature between Celsius, Fahrenheit and Kelvin. Free online temperature converter with formulas and examples.
Weight and mass converter
Convert weight and mass between kilograms, grams, tonnes, pounds, ounces and stone. Free online weight converter.
Speed converter — km/h, m/s, mph, knots, Mach
Convert speed between km/h, m/s, mph, knots and Mach. Fast online speed unit converter — free, no registration required.
Data size converter — bytes, KB, MB, GB, TB and more
Convert bytes, kilobytes, megabytes, gigabytes and terabytes. Supports both SI (GB, TB) and IEC binary (GiB, TiB) standards — free online tool.
Time units converter — seconds, minutes, hours, days
Convert seconds, minutes, hours, days, weeks, months and years. Free online time unit converter — fast and accurate.
Area units converter — m², ha, ar, acres, sq ft, sq yd
Convert square metres, hectares, ares, acres, square feet and square yards. Fast online area unit converter — free, no registration needed.
Clothing and shoe size converter — EU, US, UK
Convert clothing and shoe sizes between EU, US and UK systems. Tables for women, men and children — fast online size converter.
Pressure converter — bar, Pa, hPa, kPa, psi, atm, mmHg
Convert pressure between bar, Pa, hPa, kPa, psi, atm and mmHg instantly. Free online pressure unit converter for engineering, automotive and medicine.
Energy Unit Converter — kWh, J, kcal, kJ, MJ, Wh
Convert energy units: kilowatt-hours, joules, kilocalories, kilojoules, megajoules and watt-hours. Free online energy converter — no registration required.
Power Converter — KM, kW, HP, W
Convert power between units: KM (metric horsepower), kW (kilowatts), HP (SAE horsepower) and W (watts). Free online power unit converter.
Popular Currency Converter — Euro, Dollar, Pound, Franc to Zloty
Convert currencies: EUR, USD, GBP, CHF, CZK, HUF, NOK, SEK, DKK, UAH to PLN and back. Indicative NBP exchange rate from 2026-06-10. Free online currency calculator.
Popular Currency Exchange Calculator — spread and conversion cost
Calculate the amount after currency exchange and spread cost. Compare buy and sell rates — EUR, USD, CHF to PLN calculator. Free, no registration.
Angle Converter — degrees, radians and gradians
Convert angles between degrees, radians and gradians (grads). Enter the value, choose the unit — instant result. Perfect for students, engineers and scientists.
Time to Decimal Calculator
Convert hours, minutes and seconds to decimal time. Calculate decimal hours, decimal minutes and total seconds instantly.
Popular Volume Converter
Convert volume between litres, millilitres, cubic metres, US gallons, UK gallons, fluid ounces, cups and pints. Fast and precise online volume converter.
Unit and currency converters
Unit converters are indispensable wherever different measurement systems meet — in science, engineering, cooking, sport and commerce. Length can be expressed in metres, centimetres, inches, feet or miles, and accurate conversion is critical when ordering building materials or planning a route. Mass and weight conversions between kilograms, pounds, ounces and stones appear side by side in recipes, medical contexts and product descriptions. Temperature brings together three widely used scales — Celsius, Fahrenheit and Kelvin — essential for cooking, meteorology and chemistry. Volume converters handle litres, millilitres, US and UK gallons, cups and tablespoons. Speed units — km/h, m/s, miles per hour and knots — matter in transport, aviation and sport. Digital data conversions between bits, bytes, kilobytes, megabytes and gigabytes are fundamental in computing and telecommunications. Area units — square metres, acres and hectares — are central to real estate and agriculture. Clothing and shoe sizes differ between the EU, US and UK systems, making size converters especially useful when shopping from international stores online. All converters are free, instant and require no registration.
Frequently asked questions about converters
How many cm is 1 inch?
1 inch = 2.54 cm.
How many kg is 1 pound?
1 pound (lb) = 0.4536 kg.
How to convert Fahrenheit to Celsius?
Formula: °C = (°F − 32) × 5/9. E.g. 98.6°F = 37°C.
How many litres in 1 US gallon?
1 US gallon = 3.785 litres.
How many km/h is 1 m/s?
1 m/s = 3.6 km/h.
How to convert EU shoe size to US?
EU 42 ≈ US 9 (men) or US 10.5 (women). Use the size converter.
How many grams in 1 ounce?
1 ounce (oz) = 28.35 g.
How to convert miles to kilometres?
1 land mile = 1.609 km.
How many m² is 1 acre?
1 acre = 4046.86 m².
Are exchange rates up to date?
Exchange rates are fetched from NBP and refreshed every business day.