Hex to Decimal Converter

Convert hexadecimal values to decimal, binary, and octal instantly. Free, instant, no signup.

Hexadecimal value

Formula: decimal = Σ digit × 16^position (right to left, starting at 0)

How to use the Hex to Decimal Converter

Enter your values. Fill in the fields with your numbers.
Calculate. Press Calculate to run the hex to decimal converter.
Use the result. Copy the result or try a related tool next.

Why use our Hex to Decimal Converter

Instant results. Enter your figures and the hex to decimal converter returns an answer in seconds.

Free & private. Runs in your browser — no signup, and nothing is sent to a server.

Accurate. Uses standard formulas so you can rely on the numbers.

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About the Hex to Decimal Converter

The Hex to Decimal Converter turns a base-16 (hexadecimal) value into the everyday base-10 number you can read at a glance. Hexadecimal uses sixteen symbols: the digits 0 through 9 plus the letters A, B, C, D, E and F, which stand for the decimal values 10 through 15. Because each hex digit packs four bits, hex is the standard shorthand for binary data in computing. Paste a value like 1A3 or FF, press convert, and you get its decimal equivalent instantly, with no app to install and nothing to memorize.

Reach for this tool whenever you meet a hex value outside its native context and need a human-readable number. Common cases include reading memory addresses and register values while debugging, checking the size of a byte field (0xFF is 255, the largest single byte), interpreting parts of MAC and IPv6 addresses, and translating the channels of a color code such as FF in #FF5733 into 255. Embedded and firmware engineers use it to verify sensor ranges and catch overflow; students use it to check homework. Anywhere base-16 appears, this converter gives you the base-10 answer.

The math behind it is positional notation. Each hex digit is multiplied by 16 raised to the power of its position, counting from zero on the right, and the products are summed. For 62C the calculation is 6x16^2 + 2x16^1 + 12x16^0 = 1536 + 32 + 12 = 1580, since the digit C equals 12. The converter applies exactly this expansion for any length of input, so a two-digit value like FF becomes 15x16 + 15 = 255 and a longer string follows the same rule digit by digit, left to right.

Accuracy and privacy are both built in. The conversion is exact integer arithmetic, so there is no rounding or precision loss no matter how many digits you enter, and a leading 0x prefix is recognized and ignored automatically. Hex is case-insensitive here, so ff and FF give the same result. Everything runs in your browser: the value you type is never uploaded to a server or logged, which makes it safe for converting addresses, identifiers, or any data you would rather keep on your own machine.

Frequently asked questions

What does 0xFF equal in decimal?

0xFF equals 255. It is the largest value that fits in a single 8-bit byte, calculated as 15x16 + 15 = 255 because both F digits stand for 15.

Do I need to include the 0x prefix?

No. The 0x prefix is a programming convention that simply marks a number as hexadecimal; it is not part of the value. You can paste it in or leave it out, and the converter strips it automatically.

How do I convert hex to decimal by hand?

Multiply each hex digit by 16 raised to its position power, counting from 0 at the rightmost digit, then add the results. For example 1A3 = 1x16^2 + 10x16^1 + 3x16^0 = 256 + 160 + 3 = 419.

Is the converter case-sensitive?

No. Hexadecimal letters A through F can be entered in upper or lower case and produce the same result, so ff, Ff and FF all convert to 255.

Can it handle very large hex numbers?

Yes. The conversion uses exact integer arithmetic with no rounding, so long values such as FFFFFFFF (4,294,967,295) convert precisely regardless of length.

From our blog

Inches to Centimeters: The 2.54 Rule and How to Use It Without Mistakes

By the Super Simple Digital Tools Team · Updated June 2026

If there is one number worth memorizing in unit conversion, it is 2.54. That single factor connects the inch and the centimeter completely: every inch is exactly 2.54 cm, no matter what you are measuring. The value is not rounded or estimated. When countries signed the International Yard and Pound Agreement in 1959, they fixed the yard at exactly 0.9144 meters, and because a yard holds 36 inches, each inch landed at precisely 0.0254 meters, or 2.54 centimeters. Knowing it is a definition, not a measurement, is what lets you trust the result down to the decimal.

The conversion itself is a single multiplication, which makes it easy to do in your head for round numbers. One inch is 2.54 cm, so ten inches is 25.4 cm and a hundred inches is 254 cm. The decimal point simply shifts. For the common case of a foot, 12 inches becomes 30.48 cm, which is why people loosely say a foot is about 30 cm. Once you anchor on a few of these, you can sanity-check any converted figure at a glance and catch a misplaced decimal before it becomes a problem.

Heights are where this conversion shows up most often, and they need one extra step because they usually arrive as feet plus inches. Convert the feet to inches first, add the leftover inches, then multiply the total by 2.54. A 5-foot-10 person is 70 inches, which is 177.8 cm. A 6-foot person is 72 inches, or 182.88 cm. Doing it in that order avoids the classic mistake of converting feet and inches separately and losing track of the units along the way.

Screen sizes deserve a special warning. A TV or monitor described in inches refers to the diagonal of the visible panel, so a 55-inch screen is 139.7 cm corner to corner, but its actual width is closer to 121 cm and its height around 68 cm on a 16:9 panel. If you are checking whether a TV fits a cabinet or a wall, convert the diagonal for reference, but rely on the width and height figures for the real footprint. Measure only the glass, not the bezel or housing, when comparing against a converted number.

For precision work, the order of operations matters more than the conversion. Because 2.54 is exact, errors creep in only when you round too early. If a calculation chains several steps, carry the full unrounded centimeter value through to the end and round once at the finish. For machining, sewing, or fabrication where a millimeter counts, that habit is the difference between a part that fits and one that does not, while for casual estimates a couple of decimal places is plenty.

Memorize the anchors: 1 in = 2.54 cm, 12 in = 30.48 cm, and 10 in = 25.4 cm, so you can spot a wrong answer instantly.
For heights, convert feet and inches to total inches first, then multiply by 2.54 once instead of converting each part separately.
Treat a TV or monitor inch size as the diagonal only; use the panel width and height, not the diagonal, when checking if it fits a space.
When you need millimeters, multiply inches by 25.4 directly rather than converting to centimeters and then to millimeters in two rounding-prone steps.

Read the full guide →

Tool by the Super Simple Digital Tools Team. Reviewed by our editorial team. Free to use, no signup required.