Compound Interest Calculator
Calculate compound interest with any compounding frequency and optional monthly deposits.
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Detailed breakdown
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What is the Compound Interest Calculator?
Compound interest means you earn interest on your interest. This calculator supports yearly to daily compounding and optional monthly deposits, and shows the effective annual rate so you can compare different products fairly.
How to use this calculator
- Enter your values in the input fields. Use the sliders where available for quick changes.
- Choose the options that fit your case - currency, number format and decimals can be changed in the Options bar.
- The result updates instantly as you type. Press Calculate to refresh.
- Review the summary, the chart and the detailed table (when shown).
- Use Export & share to download a snapshot image (PNG or JPG), copy the result, print, save a CSV, or copy a link that reopens your inputs.
Formula and method
Compound interest = A - P
With deposits, each monthly deposit is compounded at the equivalent monthly rate.
Worked example
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Options you get
- Currency symbol and Indian or international digit grouping
- Decimal places control
- Instant results with charts and tables (where relevant)
- Snapshot image export (PNG / JPG), copy image, CSV, print and share link
- Light and dark themes - works on mobile, tablet and desktop
Frequently asked questions
Which compounding is best?
More frequent compounding gives slightly higher returns at the same stated rate. Compare products using the effective annual rate.
What is the Rule of 72?
Divide 72 by the annual rate to roughly estimate the years needed to double money. At 8%, money doubles in about 9 years.
Is this calculator free to use?
Yes. All MCSBiz calculators are free, work in your browser and need no sign-up.
Is my data stored or sent to a server?
No. Calculations run on your own device. Your inputs are not uploaded, and nothing is saved unless you choose to share a link or export an image.
Can I save or share my result?
Yes. Use "Download PNG" or "Download JPG" to export a snapshot image, copy the result, print it, download a CSV, or copy a link that reopens the calculator with your inputs.
Important note
Results are estimates based on the inputs and assumptions shown. Investments are subject to market risk and past performance does not guarantee future returns. This is not financial, tax or legal advice - please verify with official sources or a qualified professional.