U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 28, 2025

All TitlesTitle 5Chapter IPart 591Subpart B - Subpart B—Cost-of-Living Allowance and Post Differential—Nonforeign Areas
View all text of Subpart B [§ 591.201 - § 591.244]
§ 591.209 - What is a price index?

(a) The price index is the COLA area price divided by the DC area price and multiplied by 100.

(b) Example:

COLA Area Average Price for Item A = $1.233 DC Area Average Price for Item A = $1.164

Computation:

$1.233/$1.164 = 1.0592783 1.0592783 × 100 = 105.92783.

(c) In the case of the final index, OPM rounds the index to two decimal places.

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