Loading…
Calculators
Calculate the future value of an investment with compound interest. Set principal, interest rate, compounding frequency (daily/monthly/annually), time period, and optional recurring contributions.
Follow these simple steps to get instant, accurate results directly in your browser:
Enter your starting investment balance.
Specify the annual return rate (%), investment timeframe (years), and recurring monthly deposit.
Review future total balance, total interest earned, and annual contribution breakdown.
The Compound Interest Calculator models the exponential growth of investments, savings accounts, and retirement funds over time with customizable contribution schedules and compounding frequencies.
Unlike simple interest where gains remain linear, compound interest adds earned interest back into the principal base, allowing future interest to be calculated on both principal and accumulated returns. The tool supports annual, semi-annual, quarterly, monthly, and daily compounding, combined with regular monthly or annual deposits.
All growth calculations execute locally on your device, keeping your personal wealth targets, retirement projections, and investment portfolios strictly private.
Disclaimer: This tool is provided for educational and estimation purposes only and does not constitute financial or tax advice. Consult a certified financial advisor or accountant for formal planning.
A = P * (1 + r/n)^(nt) + PMT * [((1 + r/n)^(nt) - 1) / (r/n)]Where A is future value, P is initial principal, r is annual interest rate (decimal), n is compounding frequency per year, t is time in years, and PMT is the regular monthly contribution.
Initial Deposit P = $10,000 Annual Rate r = 7% (0.07), Compounded Monthly n = 12 Time t = 10 Years Monthly Deposit PMT = $200 Total Accumulated Balance A = $54,772.48 Total Principal Contributed = $34,000 ($10,000 initial + $24,000 deposits) Total Compound Interest Earned = $20,772.48.
Our calculation methodologies adhere to published guidelines from authoritative government agencies and standards bodies:
Models daily, monthly, quarterly, semi-annual, and annual compounding schedules.
Simulates regular monthly or annual cash additions made over the investment horizon.
Interactive chart contrasting principal deposits against compound interest growth.
Runs in-memory with zero financial tracking or storage.
Project long-term compound growth for IRA, 401(k), and index fund savings over 20-40 years.
Calculate exact interest yields on monthly compounding cash reserves.
Determine monthly contributions needed to reach educational savings targets.
Explore complementary utilities for your workflow