Why you need this
Sales can grow while food cost and fixed costs rise with them, leaving profit flat. Putting these four lines together shows whether the month truly made money.
The tool derives food cost from sales, then subtracts payroll and rent as fixed amounts. If utilities or marketing are missing, read the result as optimistic.
How it is calculated
Food amount = sales x food cost rate. Gross contribution = sales - food amount. Net profit = sales - food - payroll - rent. Net margin = net profit / sales.
How to read the result
Positive net profit means the month roughly stands; negative means fixed costs or food cost dominate. Strong gross but weak net points to payroll and rent.
This tool is for information only. Talk to your accountant for a formal P and L.