Guide

How much is left on the roll?

Measure today’s roll diameter and let a calculation calibrated on the full roll give the remaining length and share. A 50 m calendered vinyl example is preset.

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Quick start

Measure your roll

Measurement method

By full-roll diameterRecommendedBy material thicknessBy weighing

Enter the diameter of a new roll and today’s diameter in mm. The most practical accurate way.

Outer diameter today (mm)

Measure across the outermost wrap, for example 120 mm (you can type 12 cm).

New roll outer diameter (mm)

Measure a new roll of the same product, for example 145 mm.

Full roll length (m)

The length on the roll label, for example 50 m.

Advanced settings

Core (cardboard tube) outer diameter (mm)

A 3″ core with its cardboard is usually 83 mm.

Roll width (cm, optional)

If entered, the remaining m² is calculated too, for example 126.

Enter your values; the result appears here.

Result

Roll cross-section

Full roll
Today
Core

The dashed line is the full roll, the fill is the material left today; ring area is proportional to remaining length.

Thickness, core and roll sizes are sourced estimates; calibrating with your own roll gives the most accurate result.

What does this page calculate?

A half-used roll in the workshop raises the question “will this job fit?” before you start. The tool calculates how many metres are left, the share of a full roll, the remaining m² if you enter the roll width, and lower and upper bounds for measuring error. The page opens with the calibration method and a 50 m, 126 cm wide calendered vinyl roll: full diameter 145 mm, today 120 mm, core 83 mm.

Three methods

Diameter: enter today’s outer diameter, the core’s outer diameter and the wrap thickness. Fastest, but the thickness is a preset.
Calibration (recommended): enter the full roll length and outer diameter once; the tool finds the real wrap thickness. Remaining = full length × (D² − d²) ÷ (D_full² − d²).
Weight: weigh the full roll, the empty core and today’s roll. Remaining = full length × (m − m_core) ÷ (m_full − m_core). The method least sensitive to measuring errors.

The real trap: thickness

Each wrap on the roll is not just film; film + adhesive + release liner are wound together. ORACAL 651 film is 70 µm, but with its 137 g/m² liner one wrap is about 0.22 mm. Calculating with film thickness alone overstates the remaining length about threefold. Calibration removes this guess.

Example: 50 m calendered vinyl

Full diameter 145 mm, core 83 mm, roll 50 m. The tool finds the wrap thickness π × (145² − 83²) ÷ (4 × 50,000) ≈ 0.222 mm. With today’s diameter of 120 mm the remaining length is 50 × (120² − 83²) ÷ (145² − 83²) ≈ 26.6 m, about 53% of a full roll. At 126 cm width that is about 33.5 m². A ±2 mm diameter error keeps the result between 24.9 and 28.3 m. At 95 mm about 7.6 m is left and the tool shows a reorder warning.

How to use the result

The formula assumes tight, even winding; loose or telescoped rolls hold a little less. Before a critical job, plan with the lower bound. If little is left, add the same product and roll width to the basket and request a quote; our branch will reply with price and stock. You can compare with the length of your print job from the print calculator.

Source: formula from a Signs101 forum table and the ring-area derivation; calibration and weight methods from FireSprint and Signs101 user methods; ORACAL 651 and Avery MPI 1105 thicknesses from manufacturer data sheets. Liner thickness was estimated from its weight; values are approximate.

Last updated: 20 October 2026 · Full tool page

How does it work?

The cross-section area of the material on the roll equals remaining length × wrap thickness.

Choose the material
Calendered or cast vinyl, laminate, banner, mesh or paper; full roll length and width.
Choose the method
By material thickness (fast), by full-roll diameter (recommended) or by weighing (most accurate).
Measure
Measure outer and core diameters in mm, or weigh the roll.
See what is left
Remaining metres, m², share of a full roll and an uncertainty band; if low, add a new roll to the basket.

Frequently asked questions

How do you get the remaining metres from the roll diameter?

The cross-section of the material equals remaining length times the thickness of one wrap. The formula is L = π × (D² − d²) ÷ (4 × t). D is today’s outer diameter, d the core’s outer diameter and t the total thickness of film + adhesive + liner.

What does calibration mean?

The full roll length is on the label. Measure the outer diameter once while the roll is new and the tool finds the real wrap thickness, so you no longer need to guess it. For a 50 m calendered vinyl with a full diameter of 145 mm, the wrap is about 0.22 mm.

Which core diameter should I enter?

The outside of the cardboard. A 3-inch core is 76 mm inside; with the cardboard wall the outside is usually 82–84 mm. Entering the inside diameter overstates the remaining length by several metres.

How precise must the diameter be?

A 2 mm diameter error changes the result by about ±1.7 m on a 120 mm calendered vinyl roll. The tool shows this as lower and upper bounds. For a more precise result use the weight method.

When should I reorder?

The tool warns when less than 15% of a full roll is left, about 7.5 m on a 50 m roll. You can add the same product and roll width to the basket and request a quote.