Coils add up a significant amount of actual raw cable used based on the length of the coils and diameter.
15 cm (≈6″): 1.75 M (≈6 ft) raw cable
20 cm (≈8″): 2.1 M (≈7 ft) raw cable
Example: 15 cm (≈6″) coil w/ 1.5 M (≈5 ft) straight cable length = 3.25 M (≈11 ft) actual raw cable used