Calculators

Effective Annual Rate Calculator

Convert a nominal annual rate into an effective annual rate for a selected compounding frequency.

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How to use Effective Annual Rate Calculator

Effective annual rate equals ((1 + nominal rate ÷ periods per year)^periods per year − 1) × 100.

Nominal rate must be greater than −100% and at most 1,000%. No fees, promotional rates, continuous compounding, or regulated APR/APY disclosure requirements are modeled.
Decimal inputs have at most 120 characters and magnitude from 1e-100 to 1e15, or zero. Floating-point results are rounded to 12 significant digits; extreme derived results may underflow or be rejected. Exact integer results are identified separately.
Educational estimate with user-entered assumptions, not a quote or financial/tax advice. Rates are hypothetical, fixed, and not fetched. Fees, taxes, inflation, payment-day conventions, and currency rules are excluded unless explicitly entered.

What calculation does Effective Annual Rate Calculator perform?

Effective annual rate equals ((1 + nominal rate ÷ periods per year)^periods per year − 1) × 100.

Can two accounts with the same nominal rate have different effective rates?

Yes. Different compounding frequencies can produce different effective growth, assuming other terms are equal.

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