Simple Interest Calculator
Calculate simple interest and the total amount using I = P × r × t.
Loading tool
This tool runs in your browser. Nothing is uploaded.
About Simple Interest Calculator
Simple Interest Calculator applies interest to the original principal only, using I = P × r × t, and shows the total amount at the end of the term.
For students, short-term personal loans and some savings products that do not compound.
What it does
- Term in years, months or days
- Formula with your numbers substituted
- Year-by-year totals
How to use Simple Interest Calculator
- Enter the principal, annual rate and term.
- Pick the term unit.
- Read interest and total.
Frequently asked questions
How are days converted to years?
Days are divided by 365. Some lenders use 360; results then differ slightly.
When is simple interest used?
Mostly for short-term loans and some bonds. Most savings accounts compound, so use Compound Interest Calculator for those.
Limits and privacy
Uses a 365-day year.
Everything happens on your device, so your content never reaches our server.
Related tools
Compound Interest CalculatorSee how savings grow with compounding and regular contributions.In browserLoan Repayment CalculatorEstimate regular loan payments, total interest and a full amortisation schedule.In browserPercentage CalculatorSolve every common percentage question: X% of Y, what percent, and percentage change.In browser