Calculate simple interest on loans and investments. Enter principal amount, interest rate, and time period to find total interest earned or paid, future value, and detailed breakdowns. Perfect for short-term loans, savings accounts, and investment planning.
Simple interest is calculated only on the principal amount of a loan or investment. Unlike compound interest, simple interest does not earn interest on previously accumulated interest. It is commonly used for short-term loans, car loans, and some savings accounts.
Example: $10,000 invested at 5% simple interest for 3 years
Interest = $10,000 × 0.05 × 3 = $1,500
Total Amount = $10,000 + $1,500 = $11,500
| Year | Simple Interest (Annual) | Compound Interest (Annual) |
|---|---|---|
| Year 1 | $500 | $500 |
| Year 2 | $500 | $525 |
| Year 3 | $500 | $551.25 |
| Year 5 | $500 | $638.14 |
| Year 10 | $500 | $814.45 |
| Total Interest (10 years) | $5,000 | $6,288.95 |
📋 Common Applications:
• Short-term loans: Personal loans, payday loans, and bridge financing
• Car loans: Many auto loans use simple interest calculations
• Certificates of Deposit (CDs): Some short-term CDs offer simple interest
• Bonds: Government and corporate bonds typically pay simple interest
• Savings accounts: Basic savings accounts may use simple interest
❓ How to convert time units to years?
• Months: Divide by 12 (e.g., 6 months = 0.5 years)
• Days: Divide by 365 (e.g., 90 days = 0.2466 years)
• Our calculator handles all time units automatically!
❓ Is simple interest better than compound interest?
For borrowers: Simple interest is better because you pay less total interest.
For investors: Compound interest is better because you earn more over time.
❓ What if the interest rate is annual but the term is in months?
Convert the time to years. For example, 6 months = 0.5 years. Our calculator does this automatically when you select months or days.
❓ Are there fees associated with simple interest loans?
Yes, lenders may add origination fees, processing fees, or prepayment penalties. Always read loan terms carefully.
💡 Pro Tip: Use simple interest for short-term borrowing (under 5 years). For long-term investments like retirement, compound interest will generate significantly higher returns. Compare both calculators to see which works best for your financial goals.