About the Interest Calculator
The Interest Calculator on truecalculator.net computes both simple and compound interest for savings, investments, and loans. You enter a principal amount, an interest rate, a time period, and the compounding and payment frequencies. The output shows the total interest accrued and the final balance for each scenario.
For compound interest, the tool applies the standard formula A = P(1 + r/n)^(nt), where P is the principal, r is the annual rate as a decimal, n is the number of compounding periods per year, and t is the time in years. For simple interest, it uses I = P × r × t. Tip: run the same principal twice with monthly and annual compounding to see how much frequency changes the result. For major financial decisions, consider speaking with a professional.
- Enter the principal amount and the annual interest rate.
- Set the time period, compounding frequency, and payment frequency.
- Review the total interest and final balance, then adjust inputs to compare scenarios.