Simple Interest Calculator
Calculate simple interest on any amount.
How to Calculate
Simple Interest = P × r × t
Multiply the principal (P) by the annual interest rate (r) as a decimal, then multiply by time (t) in years.
Worked Example
Principal: £10,000, Rate: 5%, Time: 3 years → Interest: 10000 × 0.05 × 3 = £1,500. Total: £11,500.