What is the formula for compound interest with regular contributions?

The formula calculates the compound growth of the principal P × (1 + r/n)^(nt) plus the future value of the recurring monthly annuity payments.

What is a realistic annual rate of return?

Historically, broad stock market index funds (such as the S&P 500) have averaged approximately 7% to 10% annual nominal returns before inflation over long horizons.

Can I change currencies?

Yes. Toggle between $, €, £, ₹, and ¥ at the top of the calculator for convenient localized calculations.

Calculator ToolsInvestment Calc

Compound Interest Calculator

Forecast future investment value, total interest accrued, and compounding growth with monthly contributions and annual schedules.

Currency Symbol

Initial Deposit ($)$10,000.00

Monthly Contribution ($)$200.00/mo

Annual Interest Rate (%)7.0%

Period: 15 Years

Compounding

Estimated Future Balance

$92,251.72

In 15 years at 7% compound interest.

Initial Deposit$10,000.00

Total Additions$36,000.00

Total Interest Earned+$46,251.72

Deposits: 49.9%Interest: 50.1%

How to Use Compound Interest Calculator

Follow these simple steps to complete your task in seconds.

Enter Initial Deposit

Set your starting investment capital and expected monthly regular contribution.

Choose Rate & Time Horizon

Define your expected annual return percentage and investment timeframe in years.

View Growth & Schedule

Review total interest earned vs principal deposits, visual ratio bars, and yearly balance tables.

Why Choose Quicklity for Compound Interest Calculator

Engineered for speed, privacy, and flawless conversion accuracy.

Regular Monthly Deposits

Factor in ongoing dollar-cost averaging contributions to visualize realistic long-term wealth growth.

Multiple Compounding Frequencies

Support for monthly, quarterly, semi-annual, annual, and daily interest compounding.

Yearly Schedule Breakdown

Full year-by-year schedule detailing cumulative contributions, interest gained, and ending balance.

100% In-Browser Privacy

Your financial portfolio plans and figures never leave your device memory.

Frequently Asked Questions about Compound Interest Calculator

Everything you need to know about using this tool.

Compound interest is interest calculated on the initial principal and also on the accumulated interest from previous periods. It allows wealth to grow exponentially over time.

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