See exactly how your money grows — with daily, monthly, or annual compounding.
Calculate compound interest on a lump-sum or with monthly contributions. Choose daily, monthly, quarterly or annual compounding and watch your balance grow.
The standard formula is FV = P × (1 + r/n)^(n×t), where P is the principal, r is the annual interest rate (as a decimal), n is the number of compounding periods per year, and t is the number of years. This calculator applies this formula automatically as you adjust inputs.
Simple interest is calculated only on the original principal. Compound interest is calculated on the principal plus any interest already earned. Over long periods, this difference becomes dramatic — compound interest can produce returns many times larger than simple interest at the same rate.
More frequent compounding always produces a higher return. Daily compounding yields slightly more than monthly, which yields more than annual. For most savings accounts and fixed deposits, monthly or quarterly compounding is standard. The practical difference between daily and monthly is small — but over 30 years it can add up.
The basic mode calculates growth on a lump-sum principal. Switch to the "With Contributions" mode to model regular monthly additions — useful for dollar-cost averaging into a savings account, brokerage or retirement plan where you add a fixed amount each month.
It uses the standard compound interest formula (FV = P(1 + r/n)^nt) with full floating-point precision. Results are rounded to 2 decimal places for display. Real-world returns may vary due to taxes, fees, and variable interest rates — this calculator assumes a fixed rate throughout the period.
Estimate your US monthly mortgage payment — principal, interest, taxes and insurance (PITI).
Project your retirement nest egg and the monthly income it can fund — in today's dollars.
See how big your 401(k) can grow with employer match, IRS limits, salary growth and tax-deferred compounding.
Plan Financial Independence, Retire Early — your FIRE number, FIRE age, and a side-by-side view of Lean, Regular and Fat FIRE.
Track how close you are to financial independence — progress %, savings rate, FI ratio and whether you’re ahead or behind your target FIRE age.
Compare Lean, Regular, Fat and Barista FIRE side-by-side — see the trade-off between lifestyle and time freedom.
Find the moment you can stop saving for retirement — and let compound growth carry you the rest of the way.
See how long your retirement savings will last — with inflation-adjusted withdrawals, Social Security, and pessimistic / base / optimistic scenarios.
See your new salary after a raise — or the hike % you need to hit a target.
Plan monthly investments or a one-time lump sum and see the power of compounding over time.
Calculate the monthly payment on any fixed-rate loan — auto, personal, home equity or student loan.
Know your true profit after all charges, statutory fees and taxes on equity, F&O trades.
Convert your annual salary into hourly, daily, weekly and monthly equivalents — instantly.
See how fast you can clear an existing loan — and how much interest extra payments save.
Should you rent or buy? Compare total wealth after a fixed holding period — with break-even year.
Add up everything you own minus everything you owe — your personal balance sheet in one number.