Simple Interest Calculator — Quick & Easy
Calculate simple interest returns on your investments.
About this tool
Calculate simple interest on your investments or loans. Enter principal, rate, and time to get instant results. Perfect for fixed deposits, bonds, and loan calculations.
What is Simple Interest?
Simple interest is calculated only on the principal amount — it grows linearly, earning the same fixed amount every period. Formula: SI = (P × R × T) / 100. Commonly used in personal loans, vehicle loans, government bonds, and some savings schemes.
Simple vs Compound Interest
Unlike compound interest, which earns returns on accumulated interest and grows exponentially, simple interest stays flat over time. For the same rate and tenure, compound interest always yields more. Use this calculator to quickly compare scenarios before choosing a financial instrument.
calculateWhen Simple Interest Applies
Simple interest is typically used in personal loans, vehicle loans, short-term instruments, and some government bonds. Understanding SI helps you quickly estimate loan costs and compare instruments.
At 7% p.a. for 5 years, ₹1L earns ₹35,000 in simple interest — vs ₹40,255 with compound interest.
Quick Usage Guide
- 1Simple interest calculation for investments and loans
- 2Supports daily, monthly, and yearly time periods
- 3Clear breakdown of principal and interest earned
- 4Free to use with no registration
Frequently Asked Questions
help_outlineWhat is simple interest?
Simple interest is earned only on the principal amount and does not compound. Formula: SI = (P × R × T) / 100, where P is principal, R is rate per annum, and T is time in years.
verifiedWhen is simple interest used?
Simple interest is common for short-term personal loans, certain government bonds, vehicle loans, and some fixed deposits.
quizWhat is the difference between simple and compound interest?
Compound interest earns interest on previously earned interest, so it grows exponentially. Simple interest grows linearly — the same amount is added each period.
account_balance_walletCan I calculate interest for partial year periods?
Yes. Enter time in days, months, or years and the calculator converts the period automatically.