Calculate interest earned or charged when interest is applied only to the original principal.
Compound interest, APY, future value and long-term savings-growth calculations.
Enter the requested values above and select Calculate. The result updates immediately on the page, so you can change one value and compare different scenarios without leaving the calculator.
At 6% simple interest for three years, a $10,000 principal produces $1,800 of interest.
Calculate interest earned or charged when interest is applied only to the original principal. It is designed for quick estimates and everyday problem solving. When a calculation affects a contract, tax filing, medical decision or other high-stakes situation, verify the result with the appropriate professional or authoritative source.
At 4% simple annual interest on $8,500 for 2.5 years, interest = 8,500 × 0.04 × 2.5 = $850 and ending total is $9,350.
What to check: Simple interest is not compounded interest. Lender day-count conventions, payment schedules, penalties, and fees can make real borrowing costs different from this textbook calculation.
Compare with the Compound Interest calculator when that better matches the question you are trying to answer.
Calculate interest earned or charged when interest is applied only to the original principal.
Interest = principal × annual rate × time. Total = principal + interest.
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