Estimate savings, investment growth, and recurring contributions online
Compound interest calculator for savings and long-term growth
This calculator shows how money can grow when interest is added back to the balance. Enter a starting amount, annual rate, time period, compounding frequency, and optional monthly contribution to see the final value, earned interest, and yearly growth.
What the calculator shows
- Final value based on compound interest and posting frequency
- How monthly contributions affect the future balance
- A year-by-year growth chart
- Deposited amount and earned interest shown separately
- Scenario comparison by rate, term, contribution, and compounding frequency
Compound interest formula
A = P × (1 + r/n)^(n×t)
- A - final amount
- P - initial amount
- r - annual interest rate (in decimal form)
- n - number of interest postings per year
- t - number of years
When this is useful
Long-term saving: Estimate how a deposit or bond-style investment can grow over a long period with different compounding frequencies.
Monthly investing: Add a monthly contribution to see how regular deposits change the final balance.
Scenario planning: Change rate, term, and contributions to compare several saving or investment scenarios.
FAQ
How do I calculate compound interest online?
Enter the starting amount, annual rate, time period, and compounding frequency. The calculator will show projected final value, total deposits, and earned interest.
Can I include monthly contributions?
Yes. Add a monthly contribution to estimate how regular deposits affect long-term growth.
Is this useful for savings and investments?
Yes. It is useful for savings goals, deposits, bonds, long-term investment estimates, and personal finance planning.
What is the difference between simple and compound interest?
Compound interest grows on both the original amount and previously earned interest, while simple interest grows only on the original amount.