Interest Rate Calculator
Work out the annual growth rate needed to turn a starting amount into a target amount over time.
Solving backward for the rate
Most loan tools start from a known rate and solve for the payment. This one works in reverse: given the payment, principal, and term, it solves for the implied interest rate — useful when a lender quotes you only a monthly dollar figure.
Rate vs. APR
The number produced here is the pure interest rate on the loan amount. It won't include fees or points bundled into a lender's advertised APR, which is why this figure can come out slightly different from a lender's quoted APR.