Simple Interest Time Calculator: Determine Investment Duration Easily

The Simple Interest Time Calculator tells you how many years an investment or loan needs to earn a chosen interest. Enter principal, interest, and annual rate; the tool applies $$T=frac{I}{Ptimes R}$$. Example: $20,000 at 5.5 % reaches $4,000 interest in 3.64 years. U.S. personal-loan APRs span 6 %–36 % (CFPB, 2023).