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Percentage Calculator
Find a percentage of a number, what percent one number is of another, or the whole from a part.
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Convert between hexadecimal, decimal, binary and octal, including very large numbers.
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How to use this calculator
Enter your values. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.
Hexadecimal basics
Hex uses 16 digits: 0–9 and A–F (A = 10 … F = 15). Each hex digit is exactly 4 binary digits, which is why programmers use it for memory addresses and colors (#FF8800 = red 255, green 136, blue 0).
FF₁₆ = 15 × 16 + 15 = 255₁₀ = 1111 1111₂
Frequently asked questions
What is FF in decimal?
255.
What is 100 in hex?
64 (0x64).
About this tool
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- Formula tests passed · human review pending
- Last updated
- 31 Oct 2026
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