Food cost percent is plate cost divided by menu price.
A $4.50 plate on a $15 menu is 30 percent food cost, and the contribution before labor is $10.50. Ask the menu pricing calculator for a 30 percent target on a $4.50 plate and the price is $15.00 again. The prime cost calculator uses a period, not a plate: $4,000 of food plus $3,500 of labor on $12,000 of sales is 62.50 percent prime cost, and food alone is 33.33 percent of those sales. That labor line is the restaurant labor cost calculator input. It is wages you enter, not a payroll tax gross-up. Nothing here is a margin Dengaro promises. The restaurant profit margin calculator idea on a single plate is the contribution divided by the menu price, which is 100 minus the food-cost percent, before labor.