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Calcimator

Number Converter Suite

Comprehensive number system converter. Convert between binary, octal, decimal, hexadecimal, RGB/Hex colors, ASCII/Unicode characters, and signed integers.

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Step 1 of 4

How to Use This Calculator
  1. Choose a Conversion Type: Number Base for binary/hex/decimal/octal, Color Conversion for RGB↔Hex, ASCII/Unicode Table, or Signed Integer (Two's Complement).
  2. For number base conversion, enter the Input Number in decimal and instantly see Binary, Octal, and Hexadecimal equivalents with bit/byte counts.
  3. For color conversion, enter Red, Green, Blue channel values (0–255) to get the Hex Color, RGB CSS, RGBA CSS, and HSL representations.
  4. For ASCII/Unicode, set the Starting Code Point (e.g., 65 for 'A') and Number of Characters to explore a range of characters with their hex codepoints.
  5. For signed integers, enter the Signed Value and select 8-bit, 16-bit, or 32-bit width to see the Two's Complement binary and hex encoding.

What each input means

Conversion Type
Calculation mode to use.
Input Number
Enter a decimal number to convert.
Red (R)
Red color channel (0-255).
Green (G)
Green color channel (0-255).
Blue (B)
Blue color channel (0-255).
Hex Color Value
Enter hex as decimal (e.g., 0x8080FF = 8421631).
Starting Code Point
Unicode code point to start from (65 = 'A').

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Conversion Type = 0, Input Number = 255, Color Mode = 0, Red (R) = 128 = 12 input(s) provided
  2. Calculate Binary
    Binary = paddedBinary
    1111 1111 = 1111 1111
  3. Calculate Hexadecimal
    Hexadecimal = `0x${hex
    0xFF = 0xFF
  4. Calculate Decimal
    Decimal = decimalValue
    255 = 255
  5. Calculate Octal
    Octal = `0o${octal
    0o377 = 0o377

Engine last updated . Checked against 5 independently-derived tests — how we verify calculators.

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