Mondo Knows Tools
Compound Interest Calculator
Growth with compounding and optional regular deposits. Use the free compound interest calculator below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.
$
$
%
years
Mondo says
Future value
$124,379.03
Total contributed$53,000.00
Interest earned$71,379.03
Growth multiple2.35x
How it works
Interest is applied on the balance including previously earned interest, so growth accelerates over time. Add a monthly deposit to model regular saving.
The formula
A = P(1 + r/n)^(nt) + PMT x ((1 + r/n)^(nt) - 1) / (r/n)Compound Interest Calculator: common questions
- What does the Compound Interest Calculator work out?
- Growth with compounding and optional regular deposits. It is one of the Money & Finance tools on Mondo Knows.
- How is the Compound Interest Calculator calculated?
- Interest is applied on the balance including previously earned interest, so growth accelerates over time. Add a monthly deposit to model regular saving. The maths is short enough to check by hand: A = P(1 + r/n)^(nt) + PMT x ((1 + r/n)^(nt) - 1) / (r/n).
- Do I need to sign up, and is my data stored?
- No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.
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Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.