CalcaTools

Hex Calculator

A Hex Calculator is a free online tool that solves hexadecimal calculator using hexadecimal calculator, hex to decimal, decimal to hex. Students, teachers, and engineers use it to check homework, prep for exams, and verify hand calculations.

Last updated: July 2026 · Free · No sign-up required

Results

Enter values above and click Calculate to see your result instantly.

Quick reference

Hex to decimal to binary:

HexDecimalBinary
A101010
F151111
1F3111111
FF25511111111
100256100000000

functions Shows the working, not just the answer

For students and teachers, the final number is only half the value. Every math tool here exposes the formula it applied, the intermediate steps, and the rounding rule, so you can follow along, check your homework, or use the answer in a proof or report with confidence.

calculate Accurate to the spec

Calculations use 64-bit floating point with sensible rounding for the domain (currency to 2 decimals, percentages to 4 decimals, algebra to 6 significant figures). Where exact rational arithmetic matters — fractions, factorials, simplification — we use a dedicated BigNumber path so 1/3 + 1/6 returns ½, not 0.49999.

school Free for classroom use

Educators are welcome to link to any math calculator on CalcaTools from a class site, Google Classroom, or worksheet. The pages are mobile-friendly, free, ad-supported (so we can keep them free) and have no sign-up wall — students just click and use them in class or at home.

tips_and_updates Pair with the spoke articles

Below the calculator we link a small set of plain-English explainer pages — "What is a percentage?", "Why does PEMDAS matter?", and so on. They cover the underlying concept in 4–6 short paragraphs. Read those before the calculator if the topic is new, or after if you want the extra context.

Interpretation guide

Where hexadecimal is used:

UseExample
Color codes#FF8800 in CSS
Memory addresses0x7FFE in programming
MAC addresses1A:2B:3C:4D:5E:6F
Byte values0x00 to 0xFF (0–255)

Formula & methodology

Formula: Each hex digit is 4 bits; decimal value = sum of digit x 16^position (right to left)

Hexadecimal is base-16, using digits 0–9 and A–F (10–15). Because each hex digit maps to exactly four binary bits, hex is a compact way to write byte values, colors, and memory addresses. The calculator performs arithmetic directly in hex and converts among hex, decimal, and binary. To convert hex to decimal, multiply each digit by 16 raised to its position from the right and sum.

Frequently asked questions

How do I convert hex to decimal?
Multiply each digit by 16 raised to its position (right to left) and add. 1F = 1x16 + 15 = 31.
What does 0x mean before a number?
The 0x prefix marks a hexadecimal literal in many programming languages, so 0xFF means 255 in decimal.
Why is hex used for color codes?
A color is three bytes (red, green, blue), and two hex digits represent each byte from 00 to FF, giving a compact 6-digit code like #FF8800.
How do I add two hex numbers?
Add digit by digit carrying at 16 instead of 10, or convert to decimal, add, and convert back. The calculator handles it directly.
How many bits is one hex digit?
Exactly four bits, so two hex digits make one byte (8 bits) with values 0x00 to 0xFF.
How does subtraction work in hexadecimal?
Same borrowing as decimal, but a borrow is worth 16. Computing 3A2 − 1FF: in the ones column 2 − F needs a borrow, giving 18₁₆ − F = 3 (18 hex = 16 + 2 = 18 decimal, minus 15 = 3); continue left for 1A3. Programmers often sidestep manual borrows via two's complement — add the complement instead of subtracting — which is what the calculator verifies.