Hex calculator.
Use this free hex calculator to get fast estimates, compare scenarios, and understand the numbers with clear step-by-step context.
Use the Hex Calculator.
Results update automatically as you type. No account is required.
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About the Hex Calculator
A hexadecimal (hex) calculator converts between hex (base 16), binary, octal, and decimal. Hex uses sixteen digits — 0–9 then A–F — and is widely used in computing for colours, memory addresses, and more.
How it works
Each hex digit represents a power of 16, with A–F standing for 10–15. Hex 1A3F = 1×4096 + 10×256 + 3×16 + 15 = 6719. The calculator converts to decimal, then to the other bases.
Reading the result
The headline shows the decimal value, with binary, octal, and hexadecimal equivalents listed alongside.
Note: Calculations run instantly in your browser and use exact mathematical formulas. For very large numbers, results are shown to standard floating-point precision.
FAQ
What do the letters A–F mean in hex?
They are digits for the values 10 through 15, which single decimal digits cannot represent. So A = 10, B = 11, up to F = 15.
Why is hex used for colours?
A colour is three bytes (red, green, blue), and each byte is exactly two hex digits — so #1A3F... is a compact way to write colour values.
How do I convert hex to binary quickly?
Replace each hex digit with its four-bit binary equivalent. The calculator does the full conversion for you.