Simple Interest Calculator
Calculate interest, total amount, or solve for any missing variable
Calculator
Year-by-Year Table
Solve for Missing Variable
Interest Calculator
Principal ($)
Annual rate (%)
Time
Time unit
Years
Months
Days
$380.00
Total Interest
$5,380.00
Total Amount
$I = 5,000 × 0.038 × 2 = $380.00
$A = 5,000 + 380 = $5,380.00
Year-by-Year Breakdown
Principal ($)
Rate (%)
Years
Year
Interest This Year
Cumulative Interest
Total Amount
Solve for Principal
Interest earned ($)
Rate (%)
Time (years)
$6,000.00
Principal
$720 = P × 0.04 × 3$
$P = 720 / 0.12 = $6,000.00
Solve for Rate
Interest ($)
Principal ($)
Time (years)
6.50%
Annual Interest Rate
$390 = 12,000 × R × 0.5$
$R = 390 / 6,000 = 0.065 = 6.5%