1 basis point = 1/100th of a percentage point. That’s 0.01% or 0.0001 as a decimal.
You can do the above conversion by dividing the BPs number by 10,000. Therefore, 50 BPs would be 0.0050 calculated by 50/10000 = 0.0050.
Multiply the decimal by the sales volume to determine your interchange charge. Let’s say the processor offers you 50 BPS for $15,000 in credit card payments. The formula for determining your charge is:
$15,000 / 0.0050 BPS (in decimal as determined by 50/10000) = $75.00