Understanding APR and APY
Interest Insights
APR vs. APY Converter
The difference between "simple" and "compound" interest can cost—or save—you thousands. Understand exactly what you're paying or earning.
Operational Guide
Mastering your interest rates is simple with our three-step process:
- Select Mode: Choose between converting APR to APY or vice versa.
- Input Rate: Enter the percentage provided by your bank or lender.
- Frequency: Select how often interest is added (Daily, Monthly, etc.).
When to use APR
Crucial for loans and credit cards. It represents the annual rate charged for borrowing without accounting for compounding.
When to use APY
Essential for savings accounts and CDs. It shows the real rate of return by including the effect of compounding interest.
The Formula
APY = (1 + r/n)^n – 1
Where r = annual interest rate and n = number of compounding periods.
Frequently Asked Questions
Why do banks advertise APY for savings, but APR for loans?
This is a marketing tactic. APY includes compounding, so it is always a higher number than APR. Banks advertise the higher APY to make their savings accounts look more attractive. Conversely, they advertise the lower APR on loans and credit cards to make the borrowing costs seem cheaper.
Does daily compounding make a big difference compared to monthly?
Over short periods or with small amounts, the difference is minimal. However, over decades (like with a retirement account) or with large balances (like a mortgage), compounding frequency can result in thousands of dollars in difference. Daily compounding always yields the highest APY for a given APR.
Are APR and Interest Rate the exact same thing?
No. In the context of a mortgage or auto loan, the "interest rate" is the base cost of borrowing the money. The APR includes that interest rate plus any additional fees, points, or broker charges required to get the loan. Therefore, APR is a more accurate measure of your true annual cost.