Free online calculator
APY Calculator
Convert nominal interest rate and compounding frequency into annual percentage yield.
Quick Answer
How It Works
APY = (1 + nominal rate / n)^n - 1, where n is compounding periods per year.
- Enter nominal annual interest rate.
- Select compounding frequency.
- Read APY percentage.
Examples use USD-style formatting. Tax rates, fees, and legal rules vary by country and change over time — treat results as estimates and confirm important numbers with a qualified professional.
Interactive Calculator
APY: 5.12%
Example Use Case
A 5% nominal rate compounded monthly yields higher APY than yearly compounding.
Detailed Guide
APY helps compare yield products on a common annualized basis by accounting for compounding frequency.
Products with identical nominal rates can produce different effective returns when compounding schedules differ.
In real usage, fees and taxes reduce realized yield, so APY should be interpreted as gross growth potential.
For better planning, compare APY with liquidity constraints and risk profile instead of chasing maximum yield alone.
Assumptions and Limits
Assumes no fees, taxes, or balance changes during the period.
Common Mistakes to Avoid
- Confusing APY with APR.
- Using daily rates as annual rates.
- Comparing rates with different compounding assumptions.
FAQ
Can I use this calculator for free?
Yes. This tool is free and designed for practical day-to-day decisions.
Why might results differ from another website?
Differences usually come from rounding rules, assumptions, or region-specific formulas.
Is this suitable for legal or financial advice?
No. Treat outputs as guidance and validate with qualified professionals for final decisions.
Related Calculators
Related Word Tools
How we choose formulas and check results: Methodology · Last reviewed 2026-07-25