Continued Fraction Convergents Calculator

Enter the continued-fraction terms to list its convergents.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

A continued fraction [a₀; a₁, a₂, a₃, …] represents a number as a nested sequence of integer terms, and its convergents are the successive fractions obtained by truncating that sequence at each step — each one the best possible rational approximation of the target value for its denominator size. Convergents are computed with the recurrence h_n = a_n·h_{n−1} + h_{n−2} and k_n = a_n·k_{n−1} + k_{n−2}, giving the convergent as h_n/k_n.

Mathematicians and number theorists use continued fraction convergents to find compact rational approximations of irrational constants like π or √2, and the same technique shows up in practical engineering problems such as choosing gear-tooth counts or musical tuning ratios that closely approximate an irrational target with small whole numbers.

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