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Summary

The contribution margin per unit is the selling price per unit minus the variable cost per unit.
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It measures how much money each additional sale contributes to the company's total profits.
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To calculate the contribution per unit, one must summarize all revenue for the product in question and subtract all variable expenses from these revenues to arrive at the total contribution margin, and then divide by the number of units produced or sold.
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Alternatively, one can use revenues per unit subtracted by variable expenses per unit.
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According to

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Summaries from the best pages on the web

Summary
To calculate the contribution per unit, summarize all revenue for the product in question and subtract all variable expenses from these revenues to arrive at the total contribution margin, and then divide by the number of units produced or sold to arrive at the contribution per unit.

How to calculate contribution per unit — AccountingTools
accountingtools.com

Summary
The contribution margin shows how much additional revenue is generated by making each additional unit product after the company has reached the breakeven point . In other words, it measures how much money each additional sale "contributes" to the company's total profits.

Contribution Margin Definition
investopedia.com

Summary
Contribution margin (CM) , or dollar contribution per unit , is the selling price per unit minus the variable cost per unit. "Contribution" represents the portion of sales revenue that is not consumed by variable costs and so contributes to the coverage of fixed costs

Contribution margin - Wikipedia
wikipedia.org

Summary
Calculating the unit contribution margin uses the total revenues, minus the variable costs divided by the total number of units.
To calculate the formula for the unit contribution margin expressed as a dollar value, use revenues per unit subtracted by variable expenses per unit.

How to Calculate Unit Contribution Margin | Small Business - Chron.com
chron.com