Compound Interest Calculator
Use your own numbers after reviewing the formula and worked example.
Quick answer
This scenario assumes $10,000 principal, a fixed 5% annual rate, annual compounding and no additional deposits or withdrawals.
Formula or method
Keep units, percentages and time periods consistent. The formula is useful as a transparent check on the calculator result and helps explain why changing one input changes the answer.
Step-by-step
- Start with $10,000.
- Use 0.05 as the annual rate.
- Use 10 annual periods.
- Multiply by 1.05 raised to the tenth power.
Worked example
The ending value is about $16,288.95, or about $6,288.95 of growth.
How to interpret the result
This is a mathematical example rather than a guaranteed investment forecast; fees, taxes and variable returns can change real results.
When the answer is used for a purchase, loan, payroll decision, construction order, school grade, health estimate or other real-world choice, verify the assumptions that matter in that context. Accurate arithmetic still depends on accurate inputs.
Common mistakes
- Treating 5% as guaranteed.
- Forgetting contributions or withdrawals.
- Ignoring taxes, fees and inflation.
Frequently asked questions
Would monthly compounding be identical?
No; the ending value would be slightly different.
What if I add monthly deposits?
Use the savings growth calculator.
Is this inflation-adjusted?
No; it is a nominal example unless otherwise stated.