Simple Interest Calculator

Calculate simple interest and the total.

PrincipalAnnual rate (%)Period unitPeriod

Result

Formula

Interest = principal × (annual rate ÷ 100) × t, where t is the period in years, or months ÷ 12. Total = principal + interest.

Calculation

Data & privacy

Client-side computation

Your numbers are calculated in this browser.

Example

Example: 1,000 at 12% a year for 6 months earns interest of 60 for a total of 1,060. A rate or period of 0 earns no interest.

Use a decimal point (.) and up to six decimal places; do not enter commas, currency symbols, or exponents. Amounts use the same unit.

Results are rounded to two decimal places. Nonzero values that round to zero are shown as a range and cannot be copied as a number.

The entered rate applies to the whole period without compounding. Actual dates, day-count conventions, product rates, and taxes are not applied.

Limits

The principal is 0 to 1,000,000,000,000 and the annual rate is 0% to 100%. The period is a whole number: 0 to 100 years or 0 to 1,200 months. A total above 1,000,000,000,000 is rejected. Actual dates, day-count conventions, product rates, and taxes are not included.

Inputs

Result

Σ Formula

Calculation

Formula