How do you calculate compound interest?

Compound interest calculator finds compound interest earned on an investment or paid on a loan. Use compound interest formula A=P (1 + r/n)^nt to find interest, principal, rate, time and total investment value. Continuous compounding A = Pe^rt.

How do you find a variable in a compound interest equation?

Divide your partial year number of months by 12 to get the decimal years. The basic compound interest formula A = P (1 + r/n) nt can be used to find any of the other variables. The tables below show the compound interest formula rewritten so the unknown variable is isolated on the left side of the equation.

What is the compound interest formula a p n nt?

The basic compound interest formula A = P (1 + r/n) nt can be used to find any of the other variables. The tables below show the compound interest formula rewritten so the unknown variable is isolated on the left side of the equation. Say you have an investment account that increased from $30,000 to $33,000 over 30 months.