Compound Interest Calculator – Growth Over Time

Enter Your Values

Fill in the principal, rate, time, and compounding frequency.

USD $

GBP £

Principal Amount

Rate (% per year)

Time (years)

Compounding Frequency

How Compound Interest Works

Compound interest grows your money by adding interest on top of previously earned interest.

Formula

A = P × (1 + r/n)^nt

P = Principal
r = Annual interest rate
n = Compounding periods per year
t = Time in years

Example

If you invest $1000 at 5% for 10 years compounded monthly:

Total Amount ≈ $1647.01
Total Interest ≈ $647.01

FAQ

Does compounding frequency matter?
Yes — more frequent compounding grows your money faster.

Can I enter decimals?
Yes, decimals work for principal, rate, and time.

Is this the same as simple interest?
No — compound interest earns interest on interest.

Why Use a Compound Interest Calculator?

Compound interest is one of the most powerful concepts in finance. It helps you understand how savings, investments, and long‑term growth evolve over time.

What You Can Calculate

Total future value
Total interest earned
Impact of compounding frequency
Growth over long periods

Who This Tool Is For

Savers planning long‑term goals
Students learning compound interest
Anyone comparing compounding frequencies

Additional FAQ

Does this include taxes or inflation?
No — this calculator focuses purely on mathematical growth.

Can I use this for loans?
Yes — the formula is the same, but loan terms may include extra conditions.