Before you start to calculate 260 Cups, you should know the conversion rate between Cups and Cubic Foot.
The rate is 8.4E-18 and the math equation is 260 X 8.4E-18 = 2.184E-15 .
Quick conversion chart of Cups to Cubic Foots
1 Cup to Cubic Foot = 8.4E-18 Cubic Foot5 Cup to Cubic Foot = 4.2E-17 Cubic Foot10 Cup to Cubic Foot = 8.4E-17 Cubic Foot20 Cup to Cubic Foot = 1.68E-16 Cubic Foot30 Cup to Cubic Foot = 2.52E-16 Cubic Foot40 Cup to Cubic Foot = 3.36E-16 Cubic Foot50 Cup to Cubic Foot = 4.2E-16 Cubic Foot75 Cup to Cubic Foot = 6.3E-16 Cubic Foot100 Cup to Cubic Foot = 8.4E-16 Cubic Foot