Interest Calculator
InternetAiTools.com · Simple Interest · Compound Interest · Compare SI vs CI
Simple Interest Calculator
Simple Interest
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Total Amount
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Gain %
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Note: Simple Interest = P x R x T / 100. Compound Interest = P x (1 + R/n)^(n x T) - P. For estimation purposes only.
Frequently Asked Questions
What is the difference between simple interest and compound interest?
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Simple interest is calculated only on the original principal amount. Compound interest is calculated on the principal plus any accumulated interest from previous periods. This means compound interest grows faster over time, especially with longer terms and higher rates.
How does compounding frequency affect my returns?
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Higher compounding frequencies (daily vs monthly vs annually) result in slightly higher returns because interest is calculated and added more often. Daily compounding gives the highest return, followed by monthly, quarterly, half-yearly, and annually. This calculator supports all these options.
What is the formula for calculating simple interest?
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The simple interest formula is: SI = P x R x T / 100, where P is the principal amount, R is the annual interest rate (%), and T is the time period in years. Total amount = Principal + Simple Interest.
What is the formula for compound interest?
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The compound interest formula is: CI = P x (1 + R/n)^(n x T) - P, where P is principal, R is annual rate (%), n is number of compounding periods per year, and T is time in years. Total amount = Principal + Compound Interest.
How accurate is this interest calculator?
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This calculator uses standard financial formulas and provides accurate results for savings accounts, fixed deposits, loans, and investment calculations. All calculations are performed locally in your browser. Results are shown with up to 2 decimal places for currency amounts.
Smart Interest Calculator for Financial Planning
Calculate simple interest and compound interest instantly with three modes: Simple Interest, Compound Interest with multiple compounding frequencies (annual, half-yearly, quarterly, monthly, daily), and a side-by-side Compare mode. Perfect for savings accounts, fixed deposits, loans, and investment planning. Everything runs locally in your browser — your numbers are never sent to any server.
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