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Interest Calculator

Calculate simple interest and compound interest. Compare how your money grows with different compounding frequencies.

Financial Calculators
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Understanding the Snowball Effect

Albert Einstein supposedly called compound interest the eighth wonder of the world, and once you look at the math, you'll see why. While simple interest only pays you based on your original deposit, compound interest pays you interest on top of your interest.

Over a long enough period, this creates a massive snowball effect. A small, consistent investment left alone for twenty years can grow into a dramatically large sum of money without you lifting a finger.

Simple Tools for Complex Math

Figuring out exactly how much your savings account or fixed deposit will yield over a decade involves some tricky exponents that nobody wants to calculate by hand on a napkin.

Our calculator does all the heavy lifting instantly. Whether you're trying to figure out if an investment is worth it, or if you're trying to see how much a personal loan is going to cost you in simple interest, the exact numbers are just a click away.

Frequently Asked Questions

It's all about what the engine calculates interest on. Simple interest is only ever calculated on your original starting amount. Compound interest keeps recalculating based on your new, growing total balance. Compound interest grows much faster.

Almost all savings accounts, fixed deposits, and credit cards use compound interest. Simple interest is extremely rare in modern banking and is usually only seen in short-term personal loans between friends.

It's how often the bank adds the interest back into your main pile of money. It could be daily, monthly, or yearly. The more frequently it compounds, the faster your money grows.

Credit cards are notorious for compounding interest daily. That means every single day you carry a balance, they calculate interest, add it to everything you owe, and then charge you interest on that new, bigger amount the next day.

Yes! If you are putting money in an FD, just plug in your starting amount, the bank's interest rate, and how long the FD is locked in to see exactly what your payout will be at maturity.

The calculator gives you raw numbers. Keep in mind that while your money might double in 10 years, rising inflation means that money might buy less than it does today.