How does compounding frequency affect my returns?

The more frequently interest compounds, the more you earn. For example, $10,000 at 10% for 10 years: annually compounds to $25,937, monthly to $27,070, and daily to $27,179. While daily compounding earns more than annual, the difference between monthly and daily is small. What matters most is the interest rate and time, not the frequency — though more frequent compounding is always better.

What is the Rule of 72?

The Rule of 72 is a simple shortcut to estimate how long it takes to double your money. Divide 72 by the annual interest rate to get the approximate number of years. For example, at 6% interest, 72 ÷ 6 = 12 years to double. At 9%, it takes 72 ÷ 9 = 8 years. This rule works best for interest rates between 6% and 10%.

What is the Effective Annual Rate (EAR)?

The Effective Annual Rate (EAR) is the actual annual return accounting for compounding. When interest compounds more than once per year, the EAR is higher than the nominal rate. For example, 12% compounded monthly has an EAR of 12.68%. This calculator shows the EAR so you can compare investments with different compounding frequencies on an equal basis.

How do regular contributions affect compound growth?

Regular contributions dramatically accelerate compound growth. Adding even a small monthly contribution to your principal can significantly increase your final balance. For example, $10,000 at 7% for 30 years grows to $76,123 without contributions. Adding just $100/month increases this to $227,510. The key is starting early — contributions made in early years have far more time to compound and create outsized returns.

Compound Interest Calculator - Calculate Investment Growth

Calculators / Financial Calculators / Compound Interest Calculator

Compound Interest Calculator

Calculate how your money grows with compound interest. Enter your principal, interest rate, time period, and compounding frequency to see your investment growth instantly.

Currency

Initial Principal

Annual Interest Rate

Time Period

Compounding Frequency

Additional Monthly Contribution

Compound Interest Results

Final Balance —

Total Principal —

Total Interest Earned —

Effective Annual Rate (EAR) —

This calculation is an estimate based on a fixed interest rate. Actual returns may vary. For investment decisions, consult a financial advisor.

Frequently Asked Questions

Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, which is calculated only on the principal, compound interest grows exponentially over time. This is why Albert Einstein reportedly called it the 'eighth wonder of the world' — money that earns compound interest grows faster and faster as time goes on.

Most Popular Financial Calculators

All Time

Salary Raise Calculator

Tip Calculator

Percentage Calculator

VAT Calculator

Savings Goal

New

Home Affordability Work backwards from your income to a price. Enter what you earn, what you owe and what you have saved, and see the house that fits.

View Page

Popular Today

Salary Raise Calculator Free salary raise calculator: enter your current pay and the raise percentage to see your new salary, the increase amount and the yearly difference.

View Page

Related Financial Calculators

Loan Calculator Free loan calculator for monthly payment, total interest and total cost. Works for personal, auto and other fixed-rate loans, with a full amortization table.

Partially Amortized Loan Calculator Free balloon loan calculator: enter amount, rate, amortisation term and actual term to see the monthly payment, balloon balance and total cost.

Break-Even Calculator Free break-even calculator: find how many units you must sell to cover costs, with break-even revenue, contribution margin and profit at any volume.

ROI Calculator Free ROI calculator: enter the amount invested and returned to see your ROI percentage, net profit, annualised return and payback period.

Discount Calculator Free discount calculator: enter the original price and discount to see the sale price, how much you save and the effective percentage off.

Other Calculators You May Like

Age Calculator Free age calculator: enter your birth date to see your exact age in years, months, days, hours and minutes, plus the countdown to your next birthday.

Date Difference Calculator Free date difference calculator: find the exact time between two dates in years, months, days and weeks, and see how many working days fall in between.

Day of the Week Calculator Free day of the week calculator: find out which weekday any date falls on - past or future - handy for birthdays, events and historical dates.

Business Days Calculator Free business days calculator: count the working days between two dates, weekends excluded - useful for deadlines, delivery dates and project planning.

Week Number Calculator Free ISO 8601 week number calculator: find which week of the year any date falls in, and see the first and last day of that week at a glance.