JAW's Compound Interest Calculator

Need to calculate some compound interest? Punch in some numbers and let's see what we get!

Amount: $
Interest rate: % pa
Add an extra: $ per
Time: days weeks years
Calculate interest:

Result: $ Your contribution $
Interest $

This calculator might not agree with other calculators, everyone has their own methods of working out compound interest - that mostly favour the lender not the lendee! A good rule of thumb is you will double your money for a one off investment at 10% in 7 years - or - at 7% in 10 years.