How to Measure a Thermal Docket, Bond Paper, or EFTPOS Paper Roll
Measuring a thermal docket roll, bond paper roll, or EFTPOS paper roll is straightforward once you understand the key dimensions involved.
By accurately measuring your existing paper roll, you can confidently order replacement rolls that fit properly and perform reliably.
Why Paper Roll Measurements Matter
Paper rolls are not one-size-fits-all products.
Receipt printers, point-of-sale systems, credit card terminals, cash registers, and EFTPOS machines are designed to accommodate specific roll dimensions.
The Four Key Measurements
When identifying a paper roll, there are four primary dimensions to consider:
- Roll width
- Roll diameter
- Core size
- Paper length (when available)
Measuring the Roll Width
The width is usually the most important measurement.
Using a ruler or measuring tape, measure straight across the face of the paper roll from one edge to the other.
Common widths include:
- 57mm
- 76mm
- 80mm
EFTPOS machines frequently use narrower rolls, while POS receipt printers often use wider formats.
Measuring the Roll Diameter
The roll diameter refers to the overall size of the roll from one outer edge to the opposite outer edge through the center.
Place the roll upright and measure directly across the middle.
Common diameters include:
- 40mm
- 50mm
- 60mm
- 80mm
The diameter affects how much paper is contained on the roll and whether it will fit inside the printer compartment.
Measuring the Core Size
The core is the cardboard tube at the center of the roll.
Measure the inside diameter of the core opening.
Core sizes vary depending on the type of equipment being used. Some compact EFTPOS terminals use smaller cores, while larger receipt printers may accommodate larger sizes. If you are replacing an existing roll, matching the core size helps ensure proper spindle fit and smooth paper feeding.
Determining Paper Length
Paper length refers to the total amount of paper wound onto the roll.
This measurement is not always easy to determine manually, as it depends on:
- Roll diameter
- Core size
- Paper thickness
Many suppliers list the paper length as part of the product specifications.
If you still have the packaging from a previous order, this information may already be printed on the label.
Thermal vs. Bond Paper Rolls
It's also important to identify the type of paper your equipment requires.
Thermal Paper
Thermal paper contains a heat-sensitive coating that produces images when exposed to a thermal printhead.
Bond Paper
Bond paper requires an ink ribbon or impact printing mechanism.
It is commonly found in:
- Kitchen printers
- Older cash registers
- Multi-part receipt systems
Checking Your Printer Specifications
If you're unsure about measurements, the easiest solution is often to check your printer or terminal documentation.
Most manufacturers specify the following:
- Recommended paper width
- Maximum roll diameter
- Required paper type
- Core size compatibility
Common Mistakes to Avoid
Many businesses focus only on roll width and overlook other dimensions.
However, a roll that is too large in diameter or uses an incompatible core can create installation problems even if the width is correct. Always verify all available measurements before purchasing replacement rolls.