Hex to Decimal Converter

Each hex digit is multiplied by 16 raised to the power of its position (starting from 0 on the right). For example, 7DE = (7 × 16²) + (13 × 16¹) + (14 × 16⁰) = 1792 + 208 + 14 = 2014. Sum all the results to get the decimal value.

Hexadecimal (base 16) uses 16 symbols: the digits 0–9 and the letters A–F, where A = 10, B = 11, C = 12, D = 13, E = 14, and F = 15. This makes it compact — a single hex digit can represent values from 0 to 15.

Decimal is a base-10 system using digits 0–9, where each digit represents a power of 10. Hexadecimal is a base-16 system using digits 0–9 and A–F, where each digit represents a power of 16. Hex is widely used in computing because it maps neatly to binary (4 bits per hex digit).

This converter supports hexadecimal values up to 7FFFFFFFFFFFFFFF, which equals 9,223,372,036,854,775,807 in decimal — the maximum value of a signed 64-bit integer.

Hex is commonly used to represent memory addresses, color codes (e.g. #FF5733 in HTML/CSS), binary data in a compact form, and bitwise operations. Languages like Python, JavaScript, and C all support hex literals natively (e.g. 0x1A3).

Yes. This converter accepts both uppercase (A–F) and lowercase (a–f) hexadecimal letters and treats them as equivalent. For example, '1a3' and '1A3' will both convert to the same decimal result of 419.

Each hexadecimal digit corresponds exactly to a 4-bit binary group. For instance, F in hex = 1111 in binary, and A = 1010. This makes hex a convenient shorthand for binary numbers, which is why it's so prevalent in low-level computing and debugging.

Common use cases include reading memory addresses in debuggers, interpreting network IP and MAC address segments, understanding HTML color codes, working with ASCII character codes, and analyzing file headers or binary data in hex editors.