💰 Finance
Simple Interest Calculator
Simple interest is charged only on the original principal, never on interest already accrued. It is how most short-term personal loans and some car loans are priced.
How it works
Principal
Annual interest rate
Time
Simple interest
Total amount
Interest per year
Frequently asked questions
How do I use the Simple Interest Calculator?
Fill in the fields above — the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.