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Frequently asked about the APY ↔ APR
What does the APY ↔ APR do?
The APY ↔ APR solves the common crypto and stock trading question: convert between apy and apr. Enter your numbers on the left, the answer updates instantly on the right — no submit button, no signup.
Is the APY ↔ APR free to use?
Yes. Every calculator on CalcMaster is free, has no usage caps, requires no signup, and shows no ads. The site is open-source-friendly and supported entirely by the author.
Does the APY ↔ APR work on mobile?
Yes. CalcMaster is fully responsive and installable as a PWA — on Android tap the browser menu → "Add to Home Screen"; on iOS Safari → Share → "Add to Home Screen". After installing, the APY ↔ APR works offline.
Where is my input stored?
Nowhere by default. Your inputs live in your browser's memory while you're on the page; a copy of your recent calculations is saved to localStorage on your device so the History page works. Nothing is sent to a server unless you explicitly enable cloud sync.
Can I trust the formula in the APY ↔ APR?
The math is sourced from peer-reviewed and standard public formulas; you can read the formula in the result card. For decisions involving real money or health, always cross-verify with a qualified professional — calculators are educational, not advice.