Simple Interest Calculator
Calculate simple interest earned on a principal amount over time.
About this calculator
The Simple Interest Calculator on NumberCals is a free, mobile-friendly tool for anyone needing to calculate simple interest earned on a principal amount over time. Enter your values in the form below and the result is computed instantly — no sign-up, no installation, no waiting.
Formula used
SI = (P × R × T) / 100
What you'll need
- Principal Amount (e.g. 10000)
- Annual Interest Rate (%) (e.g. 5)
- Time (years) (e.g. 3)
What you'll get
- Simple Interest
- Total Amount (P + SI)
Formula
SI = (P × R × T) / 100
Result
Frequently Asked Questions
What is simple interest? +
Simple interest is interest calculated only on the original principal, not on accumulated interest from prior periods.
When is simple interest used? +
It's used for short-term loans, some auto loans, and most personal loans where interest does not compound.
Related Calculators
Compound Interest Calculator
Calculate compound interest on an investment with configurable compounding frequency.
Loan EMI Calculator
Calculate the Equated Monthly Installment (EMI) for any loan.
Mortgage Calculator
Calculate monthly mortgage payment, total interest, and optional total housing cost including tax and insurance.
ROI Calculator
Calculate Return on Investment as a percentage of cost.
CAGR Calculator
Calculate the compound annual growth rate of an investment over multiple years.