Guide
DailyCalc: Understanding Simple Interest
DailyCalc’s here to help you make sense of everyday money matters. Today, we’re tackling simple interest – a basic way banks calculate how much extra you’ll pay if you borrow money or how much extra you’ll earn if you put money in a savings account.
What is Simple Interest?
Simple interest is calculated only on the original amount of money (the principal). It’s a straightforward calculation:
- Principal: The initial amount of money borrowed or saved.
- Interest Rate: The percentage charged or earned per year, expressed as a decimal (e.g., 5% = 0.05).
- Time: The length of the loan or savings period, usually expressed in years.
The Formula
The formula for calculating simple interest is:
- Interest = Principal x Rate x Time
Let’s Do an Example
Let’s say Mason wants to deposit $1,000 into a savings account that pays 3% simple interest per year for 2 years.
- Principal: $1,000
- Interest Rate: 3% = 0.03
- Time: 2 years
Using the formula:
- Interest = $1,000 x 0.03 x 2
- Interest = $60
So, Mason would earn $60 in simple interest over those two years.
How it Works in a Savings Account
When you deposit money in a savings account, the bank calculates simple interest on that deposit. At the end of the term, they pay you the interest earned in addition to your original deposit.
How it Works with a Loan
If you take out a loan, the bank calculates simple interest on the original loan amount. This interest is added to the principal, meaning you’ll have to pay back more than just the original amount you borrowed.
Important Note: Simple interest doesn’t account for compounding. Compounding involves earning interest on your interest, which is a more complex calculation used by many banks.
Key Takeaways:
- Simple interest is easy to calculate but doesn’t always reflect real-world banking practices.
- Always ask your bank about the interest
This guide was drafted with AI assistance and passed an automated accuracy and safety review. Spotted a mistake? Tell us.