Free Compound Interest & Savings Calculator
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The Power of Compound Interest
Compound interest is the engine behind long-term wealth: you earn returns not only on your original investment but also on the returns it has already generated. easyfi.app lets you model savings, investment, and mortgage scenarios side by side and watch how small changes in rate, contribution, or time compound into very different outcomes.
- Savings & Investing: initial amount, monthly contribution, rate, and horizon.
- Mortgage payoff: see how extra monthly payments cut years and interest.
- Rent vs Buy: compare long-term net worth with taxes and appreciation.
- Compare up to three scenarios at once and share results via the URL.
Frequently Asked Questions
How is compound interest calculated?
We compound monthly: each month interest is applied to the running balance plus any new contribution, so growth accelerates over time.
Can I compare multiple scenarios?
Yes, add up to three scenarios to compare different rates, contributions, or time horizons on the same chart.
Is easyfi.app free?
Yes, every calculator is free with no sign-up required. Your inputs stay in your browser and in the shareable URL.