Rates and disclosures guide
APR vs. APY vs. interest rate: what each number means
All three are annual percentages, but they answer different questions. APY describes deposit yield with compounding, APR is a borrowing-cost disclosure, and the stated interest or note rate commonly drives periodic interest.
· About 12 minutes
The shortest useful answer
| Number | Usually used for | What it helps answer | Common calculator input |
|---|---|---|---|
| Interest or note rate | Loans, mortgages, cards, and deposit accounts | What periodic rate is applied under the product’s terms? | Loan payment or amortization rate |
| APR | Borrowing | What annualized borrowing cost results after included interest and finance charges? | Comparison output; not normally the note-rate input |
| APY | Savings and other deposit accounts | What one-year yield results after the disclosed compounding assumptions? | Savings-growth input when the tool explicitly asks for APY |
The label on the form matters. Do not enter a loan APR into a field asking for the note rate, and do not convert a savings APY again when a calculator already expects APY.
Interest rate is the starting mechanism
For a loan, the interest rate is the price charged for borrowing principal before separate fees are considered. A fixed-rate amortizing loan commonly converts the annual note rate to a periodic rate, applies it to the remaining balance, and uses a scheduled payment to cover interest and reduce principal.
For a deposit account, the institution can disclose an interest rate in addition to APY. The interest rate and the rules for balance calculation, compounding, and crediting determine interest earned. The resulting annual yield can differ from the stated rate when interest compounds during the year.
APR is a borrowing-cost measure
The Consumer Financial Protection Bureau explains that a loan’s interest rate is the cost paid for borrowing, while APR is a broader measure that includes the rate and additional included fees. Both appear as percentages, but they are not interchangeable.
For a simple fixed-payment loan, prepaid finance charges can reduce the amount of cash the borrower actually receives. Charges added to the balance increase the amount repaid. Either can make the annualized cost exceed the note rate even when the scheduled term and stated rate do not change.
The Gypes Loan APR Calculator asks for the note rate because that rate drives its modeled payment. It then uses the entered cash flows and finance charges to estimate APR. Entering APR in the note-rate field would apply the fees indirectly through the rate and then count entered charges again.
APY is a deposit-yield measure
Under the CFPB’s current Regulation DD Appendix A, APY is an annualized rate reflecting the relationship between interest earned and the principal used to calculate it. It accounts for the interest rate and compounding frequency under the disclosure assumptions.
APY is designed to make deposit yields easier to compare. A nominal rate compounded more than once per year can produce an APY above that nominal rate because earlier interest can itself earn interest. APY does not mean the institution promises that a variable rate will remain unchanged for a year.
The Gypes High-Yield Savings Calculator explicitly asks for APY and converts it to an equivalent monthly growth rate. It assumes that APY remains constant and that equal deposits arrive at each month’s end.
A simple compounding example
Suppose $10,000 remains in an account for a full year with no deposits or withdrawals. If the effective one-year yield is 5%, the modeled ending balance is $10,500 before fees and taxes. That 5% is already the annual result of the assumed compounding.
If a calculator instead asks for a nominal annual rate compounded monthly, it may divide that rate by 12 and compound the monthly rate. A 5% nominal rate under that convention produces an effective annual increase slightly above 5%. The two input labels therefore lead to different arithmetic.
Use the Compound Interest Calculator when you intentionally want the site’s stated monthly-compounding convention. Use the high-yield savings tool when you have a disclosed APY from a deposit account.
APR does not directly calculate the contractual payment
The note rate, principal, term, payment frequency, and loan structure generally determine a fixed loan’s scheduled payment. APR is calculated from disclosed cash flows and included finance charges. Replacing the note rate with APR in an amortization formula can create a payment that does not match the contract.
This distinction is especially visible with mortgages. The CFPB’s mortgage rate and APR explanation notes that mortgage APR can reflect the interest rate plus points, broker fees, and other charges. The Loan Estimate places the interest rate under Loan Terms and APR in the Comparisons section.
Points change cost without simply changing principal
Discount points are upfront charges associated with a lower mortgage rate. Paying points can reduce the scheduled payment, but the upfront cost must be recovered before the option is economically ahead. A borrower who sells or refinances early may never reach that point.
The Mortgage Points Calculator asks for both quoted note rates and the points paid. It compares payment savings and remaining balance over the entered horizon. The CFPB recommends comparing offers with consistent points or credits because lenders can use different pricing structures.
APR comparisons still need consistent products
APR is useful, but one percentage cannot normalize every structural difference. Compare the same loan amount, purpose, term, rate type, payment timing, and fee treatment. A short loan and a long loan can have similar APRs but very different required payments and total dollars paid.
Adjustable-rate products require additional care. An APR calculated from initial assumptions may not show the maximum future rate or payment. Credit cards can apply different APRs to purchases, cash advances, balance transfers, or penalty conditions. A grace period can also determine whether purchase interest is charged.
Use the Loan Comparison Calculator for two level-payment fixed-rate offers, but preserve official disclosures when terms fall outside that model.
Fees and minimums can outweigh a headline APY
A high advertised APY does not establish the account’s net value. Maintenance fees, balance tiers, direct-deposit requirements, promotional periods, transaction limits, minimum balances, and the portion of the balance that earns the advertised yield can all matter.
The CFPB’s deposit advertising rules require APY disclosures and additional information in specified circumstances. The FDIC advises reviewing deposit disclosures for APY, interest rate, minimum-balance requirements, opening terms, and fees.
For a small balance, one monthly fee can exceed the interest earned. Compare the account using the balance and transaction pattern you actually expect rather than the largest advertised percentage.
Variable rates make both sides uncertain
A variable savings APY can move after opening. The APY disclosure uses required assumptions; it is not a forecast of future rate decisions. Model lower and higher APY scenarios rather than assuming today’s yield for a multi-year plan.
A variable loan rate can change with an index and margin under the agreement. Record the index, margin, adjustment frequency, caps, floors, introductory period, and maximum payment information. A current APR alone cannot represent every possible future path.
Which rate should you enter?
- Loan Payment Calculator: enter the annual note or contract interest rate, not APR.
- Loan APR Calculator: enter the note rate and itemized finance charges; let the tool estimate APR.
- Mortgage Points Calculator: enter the two quoted note rates and the points associated with the lower-rate option.
- High-Yield Savings Calculator: enter the account’s disclosed APY.
- Compound Interest Calculator: enter the nominal annual rate intended for its monthly-compounding assumption.
- Investment Return Calculator: enter account values and cash flows; it calculates realized gain and, when valid, CAGR rather than accepting an advertised rate.
Do not subtract APY from APR
A 5% savings APY and an 8% loan APR do not create a meaningful “3% spread” for a household decision. The loan accrues on an outstanding debt balance, the deposit earns on an account balance, fees and taxes may differ, and liquidity and risk matter. Paying down debt also changes future required interest, while keeping cash can preserve emergency access.
Compare dollar outcomes over the same horizon. Show starting balances, deposits or payments, fees, taxes when relevant, ending balances, and any remaining loan principal. Percentages are inputs or disclosures; household consequences occur in dollars and cash flow.
A practical comparison checklist
- Identify whether the product is paying you or charging you.
- Copy the exact label: interest rate, note rate, APR, or APY.
- Record whether the rate is fixed, variable, promotional, tiered, or stepped.
- List fees, points, credits, balance requirements, and when each amount is paid.
- Use the same amount and time horizon across offers.
- Compare payment or deposit cash flow, total dollars, and ending balance.
- Stress-test future variable rates and verify the result against official disclosures.
For the underlying formulas and payment mechanics, continue with the Interest, Compounding, and Loan Payments Guide.
This guide explains general U.S. financial terminology and simplified comparison methods. It is not a rate quote, product recommendation, official disclosure, or financial, banking, lending, mortgage, investment, tax, accounting, or legal advice. Definitions and included charges can vary by product and law. Verify current account and loan documents before acting.