Hex Calculator

Convert between hexadecimal and decimal integers.

Hex Calculator helps you convert between hexadecimal and decimal integers. Enter value, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Hex calculator does Hex Calculator is built for arithmetic, algebra, geometry, and number tools. Convert between hexadecimal and decimal integers. You enter value, then Simple Calculators computes the result instantly. Results use standard school and engineering formulas that run privately in your browser. How the math works Pick a direction under Convert, then type a Hex number (digits 0–9 and letters A–F, where A = 10 and F = 15) or a Whole number. Each hex place is worth 16 times the place to its right (1, 16, 256, 4,096…), so decimal = the sum of each digit × its place value. A leading “0x” is allowed and ignored. Binary and octal versions are shown too; only whole numbers from 0 up to 9,007,199,254,740,991 (1FFFFFFFFFFFFF in hex, about 9 quadrillion) are accepted. The formula: Decimal = sum of (digit × 16^position), counting positions from 0 on the right. Hex digits A–F stand for 10–15. Each place is worth 16 times the place to its right.