$70,000
$36,639.02
52.3%
Compound interest means you earn interest on your starting money and on interest already added. This page explains the formula, compounding frequency, regular contributions, investment growth, and key terms. Use the examples to check your own work.
Our Compound Interest Calculator quickly estimates growth from your starting amount, annual rate, time, compounding frequency, and regular contributions. It gives you a clear future value and interest estimate. Use it for quick study checks.
Enter the initial principal, annual rate, years, and contribution.
Select annual, quarterly, or monthly compounding.
Get the future value, interest earned, and growth instantly.
Copy the calculated investment details for future use.
Enter the initial principal, annual rate, years, and contribution.
Select annual, quarterly, or monthly compounding.
Get the future value, interest earned, and growth instantly.
Copy the calculated investment details for future use.
Use this compound interest formula: . Here, is future value, is principal, is annual interest rate, is compounding periods each year, and is years.
Step by step Guide:
Practical Example: After 3 years, your 1,157.63. Your compound interest is $157.63. This example assumes no extra contributions.
Compounding frequency controls how often interest gets added to your balance. Daily, monthly, quarterly, and annual compounding can produce different final values when the other inputs stay the same. This helps you compare growth choices.
Investment returns can compound over many years. Each interest amount can earn more interest later, while regular contributions can increase your final balance and total growth. Time gives each growth cycle more chances to build.
These compound interest terms explain the inputs and results you see in the calculator. Knowing them makes financial calculations easier to follow.
Principal is the money you start with. If you invest $2,000, that $2,000 is your initial principal before interest or new contributions.
The interest rate shows how much your investment can earn in one year. A 5% annual rate means $5 can grow from every $100 before compounding.
Compounding frequency tells you how often interest gets added to your balance. Common choices include annual, quarterly, monthly, and daily.
The investment period is how long your money stays invested. A longer period gives compound growth more time to build and grow.
Regular contributions are extra amounts you add during the investment period. Monthly contributions can increase your principal and future value.
Future value is the amount your investment may reach after growth and contributions. It includes your starting principal, deposits, and earned interest.
Compound interest is interest earned on your principal and earlier interest. This repeated growth can make your balance rise faster over time.
The effective annual rate shows yearly growth after compounding. It can differ from the stated annual interest rate shown for an account.
APY means annual percentage yield. It shows yearly return after compounding, so it helps compare accounts with different compounding schedules.
APR means annual percentage rate. It commonly shows a yearly borrowing cost and may not include the same compounding effect shown by APY.
Rate of return, or RoR, measures how much an investment gains or loses over a period. It can include price changes, interest, or other returns.
Compound interest and simple interest both earn returns, but they use different growth methods. This table shows the key difference in simple terms.
Feature | Compound Interest | Simple Interest |
|---|---|---|
Interest base | Principal plus earlier interest | Original principal |
Growth method | Interest earns more interest | Interest stays based on principal |
Growth over time | Can increase faster | Grows at a steady rate |
Formula | ||
Best for | Long term growth examples | Basic interest calculations |
Main factor | Principal, rate, time, and frequency | Principal, rate, and time |
Note: Compound interest can produce more growth over time because earned interest joins the balance. Actual returns depend on the stated rate and terms.
Where to invest for compound interest
Compound interest can apply to savings accounts, certificates of deposit, bonds, and some investment accounts. Compare rates, fees, risks, and account rules before choosing where to invest. Choose products that fit your goals and risk level.
Use financial calculators for loans, interest, investments, savings, taxes, and financial planning.
These answers explain contributions, RoR, TWR, compounding frequency, effective rates, APY, APR, and compound growth.