I need to calculate the volume of a pond in a hurry to treat with meds but i can't work it out 




I know theres converters online for sizes where you can enter 3 measurements..
But the pond is a circle (9ft diameter) and 4ft deep. Can anyone work out the volume for me?
I'm crap with maths and I need to do a treatment. I used an online converter but it said it was 180 gallons whic can't be right?
Thanks in advance

I know theres converters online for sizes where you can enter 3 measurements..
But the pond is a circle (9ft diameter) and 4ft deep. Can anyone work out the volume for me?
I'm crap with maths and I need to do a treatment. I used an online converter but it said it was 180 gallons whic can't be right?
Thanks in advance