- Length = W x 1000 / (Gsm x Rwd)
- Length = 3.1416 (D² – d²) / (4000 x t)
| W | Weight of reel in kg |
| Gsm | g/m² of paper |
| Rwd | Width of reels in m |
| D | External diameter of reel in mm |
| d | External diameter of core in mm |
| t | Thickness of paper in mm |
- Weight = ((D² – d²) x 3.1416 x Rwd / 4) x Rg
| D | external diameter of reel in m |
| d | external diameter of core in m Rwd = Width of reels in m |
| Rg | Specific weight of the paper in kg/m³ |
- Weight = L x Rwd x Gsm / 1000
| L | Length of sheet in metres |
| Rwd | Width of reels in metres |
| Gsm | g/m² of paper |
