Proximity Card Number Calculator & Converter

Proximity card numbers are used in various security and access control systems. This calculator helps you understand, validate, and convert between different proximity card number formats.

What is a Proximity Card Number?

A proximity card number is a unique identifier used in access control systems that use radio-frequency identification (RFID) technology. These cards are read by proximity readers without requiring direct contact.

Proximity cards typically come in different formats, including:

Wiegand format (common in access control systems)
Hexadecimal format (used in some electronic systems)
Decimal format (used in some legacy systems)

The number can represent different types of information such as employee ID, access level, or facility code.

How to Calculate Proximity Card Numbers

Calculating proximity card numbers involves understanding the format and applying conversion formulas. The process typically includes:

Identifying the card format (Wiegand, Hex, Decimal)
Determining the bit length of the card number
Applying the appropriate conversion formula
Validating the resulting number

Note: Different systems may use different bit lengths and formats. Always verify the specific requirements of your access control system.

Conversion Formulas

The primary conversion formulas used for proximity card numbers are:

Hexadecimal to Decimal: parseInt(hexString, 16)

Decimal to Hexadecimal: decimalNumber.toString(16).toUpperCase()

Wiegand to Decimal: (facilityCode << bits) + cardNumber

Where:

facilityCode is the facility identifier
cardNumber is the individual card number
bits is the number of bits allocated for the card number

Example Calculations

Let's look at an example of converting a hexadecimal proximity card number to decimal:

Example: Convert "1A3F" (hex) to decimal

Calculation: parseInt("1A3F", 16) = 6719

Result: The decimal equivalent is 6719

Here's another example showing Wiegand format conversion:

Facility Code	Card Number	Bits	Decimal Result
5	123	16	32891
10	456	16	66160

Frequently Asked Questions

What is the difference between Wiegand and Hexadecimal formats?

Wiegand format combines facility code and card number into a single number using bit shifting. Hexadecimal is a base-16 representation of the card number. The choice depends on the specific access control system requirements.

How do I know which format my proximity card uses?

Check your access control system documentation or consult with your system administrator. Different manufacturers may use different formats.

Can I convert any proximity card number format to any other?

Yes, this calculator supports conversion between Wiegand, Hexadecimal, and Decimal formats as long as you know the original format and the required output format.