Free Online Converters
Convert anything — units, currency, temperature, data sizes, timestamps, colour codes and more. 22 free converters that work instantly in your browser. No signup, no app downloads, no nonsense.
22 converters · No signup · Instant results
Unit Converter
Convert between hundreds of units across all categories — length, weight, volume, area, speed and more. The all-in-one converter.
Currency Converter
Convert between 170+ world currencies with live exchange rates. Updated hourly. Includes GBP, USD, EUR and all major currencies.
Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin. Includes common reference points and a quick conversion table.
Length Converter
Convert between metres, feet, inches, kilometres, miles, yards and more. Metric to imperial and back.
Weight Converter
Convert between kilograms, pounds, stones, ounces, grams and tonnes. Covers everyday and scientific units.
Area Converter
Convert between square metres, square feet, acres, hectares and more. Useful for property and land calculations.
Speed Converter
Convert between mph, km/h, m/s, knots and Mach. Includes common speed references.
Data Size Converter
Convert between bytes, KB, MB, GB, TB, PB and both decimal (SI) and binary (IEC) units.
Energy Converter
Convert between joules, calories, kilowatt-hours, BTU and more. Useful for physics, nutrition and energy bills.
Pressure Converter
Convert between Pascal, bar, PSI, atm, mmHg and torr. Covers meteorology, engineering and tyre pressure.
Percentage Calculator
Calculate percentages, percentage changes, percentage of a number, and what percentage one number is of another.
Number Base Converter
Convert between binary, octal, decimal and hexadecimal. Essential for developers and computer science students.
Numbers to Words
Convert numbers into written words. Handles integers and decimals. Useful for cheques, legal documents and invoices.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds.
Timezone Converter
Convert times between any two timezones. Shows current time in major cities worldwide.
Time Zone Meeting Planner
Find the best meeting time across multiple timezones. See overlapping business hours at a glance.
Cooking Measurement Converter
Convert between cups, tablespoons, teaspoons, ml, litres, ounces and grams. Covers UK, US and metric measurements.
Paper Size Reference
Convert and compare A-series, B-series, US Letter, Legal and envelope sizes. Shows dimensions in mm and inches.
Shoe Size Converter
Convert shoe sizes between UK, US, EU and Japanese systems for men, women and children.
Clothing Size Converter
Convert clothing sizes between UK, US, EU and international systems. Covers tops, bottoms and outerwear.
Colour Code Converter
Convert between HEX, RGB, HSL, CMYK and CSS named colours. Batch convert multiple colour values.
Base64 Converter
Encode text and files to Base64 or decode Base64 back to the original format. Supports binary data.
Quick Reference: Common Conversions
Length
1 mile = 1.609 km · 1 inch = 2.54 cm · 1 foot = 30.48 cm
Weight
1 stone = 6.35 kg · 1 pound = 0.454 kg · 1 oz = 28.35 g
Temperature
0C = 32F · 100C = 212F · 37C = 98.6F (body temp)
Data
1 GB = 1,024 MB · 1 TB = 1,024 GB · 1 MB = 1,024 KB
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