Long-term planning

Compound Interest Calculator

Calculate compound interest growth with flexible compounding frequencies from annual to daily. Use this Savings and investing tool to enter your numbers, review the result, and understand the key assumptions before making the next decision.

What you get
A focused calculator, clear explanation, common questions, and useful next tools.
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Result
Explanation
Common questions
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How this calculator works
The result depends on the numbers you enter and the assumptions shown below.

Compound interest earns interest on previously earned interest, creating exponential growth. The formula is A = P(1 + r/n)^(nt) where P is principal, r is annual rate, n is compounding periods, and t is years.

Review the inputs carefully and treat the output as an estimate. For decisions involving money, taxes, health, law, or security, compare the result with trusted professional guidance when needed.

Frequently asked questions

What is the difference between compound and simple interest?

Simple interest calculates interest only on the principal. Compound interest calculates interest on the principal plus all accumulated interest, leading to faster growth.

How often should interest compound?

More frequent compounding yields slightly more. Daily compounding is common for savings accounts, while annual is common for bonds.