FOUNDING YEAR: Every finished Gravity System digital product is available through October 1, 2027 — no purchase required, and physical supplies will always be optional.
The Gravity SystemThe Gravity SystemPublished by Thomas Monroe Books
Restaurant Food Cost Guide

Actual vs. Theoretical Food Cost: Find the Variance Before You Blame the Team

Understand actual versus theoretical restaurant food cost, calculate the variance, and investigate waste, portions, pricing, receiving, and count errors.

Actual food cost tells you what the restaurant consumed. Theoretical food cost estimates what the restaurant should have consumed based on approved recipes, portions, menu mix, and sales. The difference is a signal to investigate—not a verdict about why the loss happened.

Written by · Founder & Author, Thomas Monroe Books

Built from more than three decades of restaurant experience and the working-control principles behind The Gravity Restaurant Leadership System. About the author and system.

Published and reviewed September 1, 2026.

What theoretical food cost means

Theoretical cost starts with what was sold and the approved cost of producing those sales. If a menu item is supposed to use a specific portion and recipe, the theoretical model applies that approved cost to the quantity sold. The result is an expected cost based on standards.

What actual food cost means

Actual food cost is based on real inventory movement for the period: beginning inventory + purchases − ending inventory, with controlled adjustments handled consistently. It includes the effects of real operating behavior that theoretical cost may not predict.

Calculate the variance

Variance percentage points = Actual food cost % − Theoretical food cost %.
Approximate variance dollars = Food sales × variance percentage points.

If actual food cost is 33% and theoretical food cost is 30% on $100,000 in food sales, the variance is 3 percentage points, or approximately $3,000. The next job is to explain the $3,000 with evidence.

Common causes of an unfavorable gap

  • Overportioning or inconsistent recipes.
  • Waste, spoilage, overproduction, remakes, or unrecorded comps.
  • Receiving shortages, invoice errors, missing credits, or product substitutions.
  • Inventory count errors, unit-of-measure mistakes, or missed storage locations.
  • Recipe costs that have not been updated for current vendor prices or yields.
  • Unrecorded transfers or product movement.
  • Possible loss that requires careful evidence and fair review rather than assumptions.

Use a variance ladder

  1. Verify the inventory count and units.
  2. Verify invoices, credits, and major purchase-price movement.
  3. Review the highest-dollar waste and comp categories.
  4. Recheck high-cost recipes, yields, and portions.
  5. Compare the items with the largest expected-versus-actual usage gaps.
  6. Assign corrective action only after the likely cause is supported.

Do not treat people as the first explanation

A variance can come from bad data, outdated costs, weak receiving, production planning, portion drift, or genuine loss. Gravity’s operating rule is evidence before judgment. Protect the restaurant and the employee by verifying the process before making a human-impacting conclusion.

Related guides

Put the guide into a working system

Use this guide as the learning layer, then move into the Gravity Food Cost, Inventory & Purchasing System and the Food Cost, Waste & Inventory Control Workbook when you need controlled forms, recurring review, and manager follow-through.

Open the Food Cost SystemReturn to Food Cost Control