Free Compound Interest Calculator — Calculate Growth & Maturity
Free Compound Interest Calculator
Enter principal, rate, time, and compounding frequency to see the future value and total interest earned.
Understanding Compound Interest
Compound interest is calculated on the principal plus accumulated interest. Unlike simple interest, it grows exponentially over time.
Formula: A = P x (1 + r/n)^(n x t)
- P = Principal
- r = Annual interest rate (as decimal, so 8% = 0.08)
- n = Number of compounding periods per year
- t = Time in years
- A = Future value
Frequently Asked Questions
What is compound interest?
Compound interest is interest calculated on the principal plus any accumulated interest. It grows faster than simple interest.
What is the compound interest formula?
A = P x (1 + r/n)^(n x t), where P is principal, r is annual rate as a decimal, n is compounding periods per year, and t is time in years.
How does compounding frequency affect returns?
The more often interest compounds, the higher the return. Monthly compounding earns more than quarterly, which earns more than yearly.
What is the difference between simple and compound interest?
Simple interest is calculated only on the principal. Compound interest is calculated on the principal plus accumulated interest.
Is this compound interest calculator free?
Yes, completely free with no signup required.