Do not use dollar signs or commas 

Fill out the black fields only 

Click "Compute" for monthly payment

Example: To compute monthly payments on a $5,000 debt at 20% interest for a 24 month desired payoff, just enter: 
# of payments=24 Interest Rate=20 Principal=5000 (Your monthly payment will be $254.48 and total interest incurred over 24 months will be $1107.51)