About
Mortgages quote APR which already includes some fees. But finance charge is calculated assuming you keep loan to term (rare). Real effective rate higher if you pay off early. Smaller loans + same fees = much higher effective APR.
APY (annual percentage yield) tells you what a deposit earns compounded; APR (annual percentage rate) tells you what a loan costs as a nominal annual rate plus mandated finance charges. The gap between the two is compounding: a 5.00 percent APR compounded monthly produces a 5.116 percent APY, and the difference grows with compounding frequency, so a credit card quoting 24 percent APR has a 26.82 percent effective APY when interest compounds monthly. Reg Z (Truth in Lending Act) governs APR disclosure in the US, but it allows lenders to exclude voluntary items like single-premium PMI and certain title charges, which is why two lenders can show identical APRs while the cash you actually pay differs by hundreds.
Common pitfalls
- Comparing daily-compounded APY to a monthly-compounded loan APR: the bank quoting "5.13% APY" on savings versus a "5.0% APR" mortgage looks like a wash but the underlying rates differ.
- Treating closing costs as one-time and ignoring early payoff: a $5,000 origination fee on a 7-year holding period adds roughly 0.6 percent to the effective rate, not the 0.2 percent the 30-year-amortized APR implies.
Formula
Frequently asked questions
How accurate is the APR vs Effective Yield?
It applies the standard formula. Accuracy is limited only by your input precision. For decisions with material consequences (taxes, medical, legal, structural), use the result as a starting point and verify with a qualified professional in the relevant field.
Is the APR vs Effective Yield free to use?
Yes. 100% free, no signup, no payment, no API key. The site is funded by display ads around the tool but not inside the calculation flow.
Are my inputs saved anywhere?
No. All inputs stay in your browser tab. Closing the tab discards them. The site uses Google Analytics for traffic measurement (anonymized) but the analytics never see what you type into the form.
Can I use the APR vs Effective Yield on my phone?
Yes. The tool is responsive and tested on iOS Safari, Android Chrome, and major desktop browsers. Touch targets meet Apple's 44pt and Google's 48dp minimum.
Does the APR vs Effective Yield work offline?
Yes. Once the page has loaded, it works without internet. The calculation runs in JavaScript on your device.
How do I report a bug or suggest improvement to the APR vs Effective Yield?
Email hi@3tej.com with the URL of this page and a description of what you saw vs expected. We typically respond within 72 hours.
Can I share results from the APR vs Effective Yield?
Take a screenshot or copy the output. The page doesn't generate shareable URLs for specific calculations - inputs stay in your browser only.
Why are the results different from another apr vs effective yield tool?
Most likely: different formula assumptions, different default values, different rounding rules, or different applicable rates. Check the methodology if both tools document it. Both can be valid for different scenarios.
Is the APR vs Effective Yield accurate?
The APR vs Effective Yield applies the standard formula for apr vs effective yield. Accuracy is limited only by your input precision. For decisions with material consequences, use the result as a starting point and verify with a qualified professional or the relevant official source.
Is the APR vs Effective Yield free?
Yes. 100% free, no signup, no payment, no API key. The site is funded by display ads that appear around the tool but not inside the calculation flow.
Are my inputs saved?
No. Inputs stay in your browser tab. Closing the tab discards them. The site uses Google Analytics for traffic measurement (anonymized) but does not see what you type into the form.
How to use the APR vs Effective Yield
The APR vs Effective Yield is a browser-based tool that runs entirely on your device. Inputs you enter never reach a server - all calculations happen client-side in JavaScript. This means:
- Privacy: nothing is logged, sent, or stored by 3Tej. Inputs disappear when you close the tab.
- Speed: results update as you type. No network round trip.
- Offline use: once the page is cached, it works without internet.
- No signup: no account, no email, no rate limits.
Step by step
- Enter your inputs in the form above. Each field is labeled with its unit (currency, percent, kg, etc.) and the expected range.
- Read the result as it updates. The number reflects the formula commonly accepted in APR vs Effective Yield-related calculations.
- Adjust to see sensitivity: change one input at a time and watch how the output moves. This is the fastest way to understand which variable matters most.
- Copy or screenshot the result for later reference. The page state persists for the session if your browser allows it.
When you would use this
- Quick estimates: when you need a number now and don't want to open a spreadsheet.
- Sensitivity analysis: testing how a result changes as inputs vary, before committing to a real-world decision.
- Comparison: running the same calculation with different inputs to compare options side by side.
- Learning: building intuition for how the underlying math behaves.
- Documentation: capturing a snapshot of inputs and outputs at a point in time.