Converters
Convert length, weight, temperature, area, volume, speed, time, energy, data storage, and other common measurement units online.
Choose a tool and get an instant result
BlinkCalc tools are designed to be fast, practical, privacy-conscious, and easy to understand. Every result is calculated in your browser.
Acres to Hectares
Convert between acres and hectares instantly.
Area Converter
Convert between square meters, kilometers, inches, feet, acres, and hectares.
Celsius to Fahrenheit
Convert any temperature between Celsius and Fahrenheit instantly.
Cooking Converter
Convert between cups, tablespoons, teaspoons, fl oz, ml, and litres.
Data Storage Converter
Convert between bits, bytes, KB, MB, GB, TB, and PB.
Days to Weeks
Convert any number of days to weeks and days instantly.
Dress Size Converter
Convert women's dress sizes between US, UK, EU, French, Italian, and Australian.
Energy Converter
Convert between joules, calories, kilowatt-hours, BTUs, and more.
Horsepower to Watts
Convert between horsepower and watts or kilowatts instantly.
Inches to CM
Convert between inches and centimeters with a conversion table.
KG to LBS
Convert between kilograms and pounds with a quick reference table.
Length Converter
Convert length units such as meters, feet, inches, kilometers, and miles instantly.
Liters to Gallons
Convert between liters and US or imperial gallons instantly.
Miles to KM
Convert between miles and kilometers with a handy reference table.
MM to Inches
Convert between millimeters and inches instantly.
MPH to KPH
Convert between miles per hour and kilometers per hour instantly.
PSI to Bar
Convert between PSI and bar pressure units instantly.
Ring Size Converter
Convert ring sizes between US, UK, EU, mm diameter and circumference.
Roman Numeral Converter
Convert numbers to Roman numerals or decode Roman numerals back.
Shoe Size Converter
Convert shoe sizes between US, UK, EU, Japanese, and centimetre systems.
Speed Converter
Convert between m/s, km/h, mph, ft/s, and knots.
Square Feet to Square Meters
Convert between square feet and square meters instantly.
Stone to KG
Convert between stone and kilograms with a reference table.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin instantly.
Time Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks, and years.
Time Zone Converter
Convert times across different global time zones.
Unit Converter
Convert between various measurement units.
Volume Converter
Convert between milliliters, liters, cubic meters, cups, pints, quarts, and gallons.
Watts to Kilowatts
Convert between watts, kilowatts, and megawatts instantly.
Weight Converter
Convert between milligrams, grams, kilograms, ounces, pounds, and stone.
Yards to Meters
Convert between yards and meters with a handy reference table.
Related categories
Math
Use free online math calculators for percentages, fractions, statistics, geometry, equations, number tools, grades, and date calculations.
Finance
Plan loans, savings, investments, salaries, taxes, retirement, budgets, interest, and mortgage payments with free finance calculators.
Health
Calculate BMI, calories, macros, heart rate zones, pregnancy dates, hydration, fitness metrics, body composition, and wellness estimates.
Date & Time
Free date and time tools to convert Unix timestamps, calculate the difference between dates, count down to a deadline, switch time zones, and convert military time.
Everyday
Practical everyday calculators for paint coverage, concrete and gravel volumes, electricity costs, wind chill, heat index, fuel cost, ABV, and more.
Developer Tools
Free online developer tools including JSON formatters, encoders, converters, validators, generators, regex testers, and debugging utilities. No signup, runs in your browser.
Frequently asked questions
Do these converters use up-to-date conversion factors?
Yes. Unit conversions use the exact factors defined by the International System of Units (SI). Currency conversions use live mid-market rates updated daily.
Can I convert between metric and imperial?
Yes. Every length, weight, area, volume, speed, and temperature converter supports both metric and imperial units side by side.
Are the results rounded?
Each result is shown to a sensible number of significant figures for the unit, but the raw decimal is available for precise work. Just click the value to copy the full precision.