Contribution margin or gross margin for calculating break-even point?

I know the numerator for calculating break-even point is Fixed Cost, but is the denominator gross margin or contribution margin? I've seen it done both ways and am very confused which one to use.

gross margin=Revenue-Variable Costs and contribution margin=Price-Cost.

Which one is it?

 
companion:
Repeat after me:

When the unit sales price is unknown, to find the break-even REVENUE we do the following:

=Fixed costs / Contribution margin

When the unit sales price is unknown, to find the break-even REVENUE we do the following:

=Fixed costs / Contribution margin

 

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