12. Loss per share

Basic and diluted loss per share are calculated using the following numerators and denominators:

Numerator		2019			2018			2017
Loss attributable to common shareholders	$	(2,832,864	)	$	(2,362,239	)	$	(4,346,200	)
Loss used in computation of basic and diluted loss per	$	(2,832,864	)	$	(2,362,239	)	$	(4,346,200	)

Denominator		2019			2018			2017
Weighted average number of common shares for computation of basic and diluted loss per share		288,398,051			237,242,674			207,131,781

For the year ended October 31, 2019, 2018 and 2017, all stock options and conversion options were anti-dilutive and, therefore, are excluded from the calculation of diluted loss per share.