Earnings per share (Tables)

12 Months Ended

Dec. 31, 2016

Class A Common Stock [Member]

Earnings Per Share Basic [Line Items]

Reconciliation of Numerators and Denominators Used to Compute Basic and Diluted Earnings per Share

The following table sets forth reconciliations of the numerators and denominators used to compute basic and diluted earnings per share of Class A common stock:

Basic net income per share:	Year ended December 31, 2016		August 6, 2015 through December 31, 2015
Numerator
Net income	$	71,247	$	23,454
Less: net income attributable to non-controlling interests		49,747		19,348
Net income attributable to Planet Fitness, Inc. - basic & diluted	$	21,500	$	4,106
Denominator
Weighted-average shares of Class A common stock outstanding - basic		43,300,288		36,243,557
Effect of dilutive securities:
Stock options		1,489		—
Restricted stock units		2,908		—
Weighted-average shares of Class A common stock outstanding - diluted		43,304,685		36,243,557
Earnings per share of Class A common stock - basic	$	0.50	$	0.11
Earnings per share of Class A common stock - diluted	$	0.50	$	0.11