Conversion Calculators
Convert between metric, imperial and other measurement systems in one click. Length, weight, temperature, data and more.
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All conversion calculators (10/10)
About conversion calculators
Our unit converters cover the ten most-needed measurement domains, supporting more than 100 units across metric, imperial, US-customary and SI systems. Each converter offers two-way conversion (change either field and the other updates), live as-you-type calculation, and reference tables of common conversions. Temperature uses the standard Celsius/Fahrenheit/Kelvin/Rankine relationships; length, weight, area, volume, speed, time and pressure use precise SI-derived factors; data storage supports both decimal (KB, MB) and binary (KiB, MiB) prefixes.
Why use our conversion calculators?
From nanometres to light-years, milligrams to tons — all the units you'll ever need.
Type in either field; the other updates instantly.
SI-derived conversion factors accurate to 15 significant digits.
Common conversions listed below the calculator for quick lookup.
Data storage supports both KB (1000) and KiB (1024) conventions.
Click any result to copy it to your clipboard.
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View all →Frequently asked questions
Are conversion factors exact?▾
Yes — we use the SI-defined conversion factors, accurate to JavaScript's full 15–17 significant digits.
How do I convert Celsius to Fahrenheit?▾
°F = °C × 9/5 + 32. Our temperature converter does this automatically, plus Kelvin and Rankine.
What's the difference between KB and KiB?▾
KB is decimal (1,000 bytes); KiB is binary (1,024 bytes). Storage manufacturers use KB while operating systems often use KiB — our data-storage converter supports both.
Can I convert between metric and imperial?▾
Yes — every relevant converter (length, weight, volume, area, speed, pressure) supports both systems side by side.
How accurate is the time converter?▾
It uses precise definitions (1 minute = 60 seconds, 1 year = 365.25 days) and is accurate to fractions of a second.
Do you support scientific notation?▾
Yes — type values like 1.5e6 or 2.3E-4 and the converter handles them correctly.