What is APR vs APY Calculator?
A APR vs APY Calculator computes apr vs apy from the inputs you provide. It applies the standard formula to the values you enter and returns the result instantly, without sending any data to a server. Free APR vs APY Calculator.
APR vs APY Calculator
APR: simple rate. APY: compounded. APY > APR with compounding.
Inputs
Result
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Breakdown
About this tool
Banks advertise APR for loans (lower) and APY for savings (higher). Both describe interest rates but APY accounts for compounding. APR × n compoundings = APY when n=1; APY > APR when n>1.
Worked example using 2026 figures: a daily-compounded 5.00% APR HYSA produces an APY of 5.127% (since (1 + 0.05/365)^365 - 1 = 0.05127). On $25,000, that compounding gap adds about $32 a year of extra interest versus annual compounding at the same nominal rate, which is the marketing point HYSAs make when they post APY rather than APR. On the loan side, a credit card quoted at 22.99% APR with daily compounding actually carries an APY closer to 25.83%, which is why minimum-payment balances grow faster than the headline rate suggests.
Common pitfalls
- Comparing APR on a savings product to APY on another. The 4.95% APY on bank A may underperform 5.00% APR daily-compounded on bank B. Always normalize to the same metric before ranking.
- Confusing card APR with loan APR. Credit cards compound daily; auto and mortgage APRs are simple-interest disclosures under TILA, which is why card APY-APR gaps are wider.
How it works
Frequently asked questions
How accurate is the APR vs APY Calculator?
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 APY Calculator 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 APY Calculator 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 APY Calculator 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 APY Calculator?
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 APY Calculator?
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 apy 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 APY Calculator accurate?
The APR vs APY Calculator applies the standard formula for apr vs apy. 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 APY Calculator 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 APY Calculator
The APR vs APY Calculator 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 APY-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.
The formula explained
This calculator uses the following formula:
APY → APR: APR = n × ((1+APY)^(1/n) - 1)
The reason this formula works is rooted in the underlying physics, finance, or biology of the problem. Behind every calculator is a published, peer-reviewed equation or a widely accepted convention. We do not invent formulas; we apply standard ones from textbooks, government tables, professional bodies, and academic literature.
If you are curious about the math, the simplest way to verify is to plug in two known numbers and compare against a known result. The calculator should match published examples to within rounding precision.