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Compound Interest & Savings Calculator

Model monthly savings with nominal or effective annual rates, inflation, deposit timing, a savings goal and a second scenario. View charts and export the monthly schedule.

ON-DEVICE TOOL

See the effect of time, regular deposits and different rate assumptions. This is an illustration, not a forecast.

Private by design: inputs stay in this browser session. Anonymous operation events contain no values, file names or photo contents.

Your inputs

Amounts: 0–1 trillion. Whole years: 1–100. Rates: −99% to 100%. Inflation: −50% to 100%.

Your result will appear here

Review the inputs, then calculate. Changing an input clears the previous result.

Assumptions & limits

Nominal rate: monthly factor = (1 + r/n)^(n/12). Effective rate: monthly factor = (1 + r)^(1/12). This equivalent-month model may differ from bank accrual and posting rules. r is the annual rate as a decimal; n is compounds per year.

Rates and deposits remain constant. Monthly saving is nonnegative. Taxes, fees and withdrawals are not included. Currency is a display label, not an exchange-rate conversion. Real value discounts the final balance by your inflation assumption.

Investor.gov · Sources

About Compound Interest & Savings Calculator

Explore how regular savings could grow over time. Model monthly savings with nominal or effective annual rates, inflation, deposit timing, a savings goal and a second scenario. View charts and export the monthly schedule. The core workflow is designed to run in your current browser.

Model monthly savings and compare deposit timing

  1. Enter the initial balance, monthly deposit and duration. Choose a nominal annual rate with a compounding frequency, or an effective annual rate.
  2. Choose beginning- or end-of-month deposits. If you include inflation, distinguish future money from its estimated purchasing power.
  3. Review contributions and interest separately, compare a second scenario, and export the monthly schedule to check the assumptions.

Check the zero-interest baseline

Starting with 1,000 and adding 100 per month for one year produces 2,200 at a 0% rate: 1,000 + 12 × 100. This baseline helps check the deposit count before you introduce a growth-rate assumption.

A constant rate is a scenario assumption, not a forecast or promised return. Taxes, fees, changing returns and missed deposits can change real outcomes. Inflation-adjusted values are estimates, not financial advice.

Key capabilities

  • Nominal and effective rate models
  • Compare two savings scenarios
  • Private financial inputs
  • Monthly CSV and yearly chart

Useful for

  • Explore a long-term savings plan
  • Estimate deposits for a future goal

Frequently asked questions

Is Compound Interest & Savings Calculator free to use online?

Yes. Compound Interest & Savings Calculator opens in a modern browser and does not require desktop software installation.

What is Compound Interest & Savings Calculator useful for?

Common use cases include Explore a long-term savings plan; Estimate deposits for a future goal.

Is my input or file uploaded?

The core processing workflow is designed to run locally in the browser. Key capabilities include Nominal and effective rate models, Compare two savings scenarios, Private financial inputs; account, comments, and anonymous analytics may still create normal site requests.

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