Interest Rate Calculator

Solve for annual rate from principal, ending balance, and time — simple or compound.

Calculator Finance Updated Apr 20, 2026
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How to Use
  1. Enter present value, future value, and time.
  2. Both simple and compound rates shown.
Input
Rate

Formulas

Simple rate
r = (FV − PV) / (PV × t)
Compound rate (CAGR)
r = (FV/PV)^(1/t) − 1

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