ROLL LENGTH CALCULATOR

Use this conveyor belt roll length calculator to check how much belt is left on a roll without unrolling it. Enter the outside diameter of the roll, the core diameter and the belt thickness.

Belt length from roll diameter

Measure the outside diameter of the roll and the core, enter the belt thickness, and see the approximate length of belt on the roll.

Don't know the thickness? Estimate it

About 1.2 mm per ply is a common figure for EP fabric; check the belt data sheet for the exact value.

Approximate belt length on the roll-

L = π × (D² − d²) ÷ (4 × t). The real length can differ by a few percent with winding tightness - measure before cutting.

Need the weight or roll diameter for a known length? Use the Belt Weight Calculator.

Need a Belt? Talk to Us

Call +91 98275 92612 or email info@shrirambeltings.com with your belt size and application. We reply with the price and delivery date.

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Frequently Asked Questions

How do you calculate the length of a conveyor belt roll?

Belt length on a roll = 3.1416 x (outer diameter squared minus core diameter squared) / (4 x belt thickness), with all sizes in the same unit. Our calculator does this for you from the roll and core diameter and belt thickness.

Why does the calculated roll length differ from the actual length?

Rolls are not always wound tightly, and belt thickness varies slightly across the roll. Treat the result as a close estimate and measure the belt when exact length matters.

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