APY Calculator

Convert a nominal (stated) interest rate to APY — Annual Percentage Yield — accounting for how often interest compounds. Daily compounding always yields more than monthly, which beats annual. Use this tool to compare savings accounts, CDs, and money market accounts on an apples-to-apples basis.

APY — Annual Percentage Yield Calculator

APY Formula

APY accounts for the effect of compounding within the year:

APY = (1 + r/n)ⁿ − 1

Where r = nominal annual rate (as a decimal) and n = number of compounding periods per year. The more frequently interest compounds, the higher the effective yield relative to the stated rate.

Nominal RateDaily APYMonthly APYQuarterly APYAnnual APY
1.00%1.005%1.005%1.004%1.000%
3.00%3.045%3.042%3.034%3.000%
5.00%5.127%5.116%5.095%5.000%
7.00%7.250%7.229%7.186%7.000%
10.00%10.516%10.471%10.381%10.000%

Frequently Asked Questions

What is the difference between APR and APY?+
APR (Annual Percentage Rate) is the nominal interest rate without compounding — it's used for loans and credit cards. APY (Annual Percentage Yield) reflects compounding and is used for savings and investment accounts. For a savings account, the APY will always be equal to or higher than the APR. When comparing savings products, always compare APY values.
Why does compounding frequency matter?+
When interest is compounded, you earn "interest on interest." The more frequently this happens, the more total interest accumulates. Daily compounding means interest is added 365 times a year, each time creating a slightly larger base for the next day's interest. The difference between daily and monthly compounding is small at low rates but grows at higher rates over longer periods.

About the Apy Calculator

This free apy calculator helps you get accurate results instantly without needing to work through the math manually. Whether you need a quick estimate or a precise figure, having a reliable tool on hand saves time and reduces errors compared to manual calculation.

How to Use This Calculator

  1. Enter your values in the input fields above. Each field is labeled to guide you.
  2. Double-check your inputs — results are only as accurate as the numbers you enter.
  3. Click the Calculate button to see your result instantly.
  4. Use the result for your planning, budgeting, or decision-making.

Why Accurate Calculations Matter

Small errors in math calculations can compound into significant problems. A 1% miscalculation in a budget or measurement can translate to hundreds or thousands of dollars in wasted resources, or result in having to redo work entirely. This calculator uses the standard formulas and methods to give you reliable results you can trust.

Tips for Getting the Best Results

Frequently Asked Questions

Is this calculator free? Yes — completely free with no account, login, or payment required. Use it as many times as you need.

How accurate are the results? This calculator uses the standard formulas for apy calculations. Results are accurate for typical use cases. For specialized or high-stakes applications, consult a professional.

Does it work on mobile? Yes. This calculator is fully responsive and works on smartphones, tablets, and desktops.