Line capacity calculator
Convert your reel's rated capacity to any line, and work out backing for a braid top-shot.
Capacity with Braid 15 lb
471 yd
Use about 93 yd of 10 lb mono backing under 100 yd of Braid 15 lb.
Capacity scales with the square of line diameter: yards with new line = rated yards × (rated diameter ÷ new diameter)². Diameters vary by brand by about ±10%.
How this tool works
Spool volume is fixed, so capacity scales with the square of line diameter: yards with the new line = rated yards × (rated diameter ÷ new diameter)². Diameters are typical manufacturer figures; brands vary by about ±10%.