Carinderia Contribution per Burner Minute: Compare Dishes at the Cooking Bottleneck

When one burner limits a carinderia’s lunch service, pesos left per plate may hide the constraint. Compare contribution—sales minus the costs that vary with the relevant production and sales decision—with the scarce burner time used. ACCA describes this as contribution per unit of a limiting factor. The kitchen application and figures below are illustrative; the ratio helps schedule a constrained service but does not calculate final business profit. Source 2

Define the real burner constraint

For a hypothetical comparison, each dish has 20 portions sold at ₱70: revenue is ₱1,400. Dish A incurs ₱900 in batch-variable costs and occupies the same single burner for 50 minutes; Dish B incurs ₱980 and occupies it for 20 minutes. Their batch contributions are ₱500 and ₱420, or ₱10 and ₱21 per burner-minute. The example assumes both batches sell, all relevant variable costs are included, and the burner is genuinely the scarce resource. These are teaching amounts, not market prices.

Compare contribution per occupied burner-minute

1. Define two repeatable batches, the constrained service window and realistic demand. Record portions prepared, sold and left over separately; take receipts and recipe yields from your own operation.
2. Count full input costs, including unavoidable trimming loss already included in those purchases. Do not add that same waste cost twice. Record per-sale costs only for actual sales, and retain production costs for unsold prepared food.
3. Classify costs for the decision: ingredients, incremental fuel, packaging and genuinely variable labour belong in contribution. Keep fixed staff costs, rent and depreciation in the separate profit calculation; also account for owner work.
4. Time occupancy of the constrained burner, including required preheating, simmering and any period a pot blocks it. Heat-off time is not automatically free capacity. If two equivalent burners are occupied for 20 minutes, record 40 burner-minutes; unequal burners require separate consideration.
5. Calculate revenue minus relevant variable costs, then divide by burner-minutes. Check demand, preparation labour, cold storage and safe holding before treating the ranking as useful.
6. Build a feasible service schedule and check it against actual results. A second burner, larger pot or shared cooking stage can change the constraint, so do not simply multiply an old ratio.

Sources: Source 2

Work the contribution calculation

Demand can reverse the apparent result. If all 20 portions of B have already incurred the illustrative ₱980 but only 10 sell at ₱70, revenue is ₱700 and the remainder after those costs is −₱280, not ₱420. Do not subtract the unsold ingredients again: their cost is already in ₱980. Preparing fewer portions tomorrow is a new decision with its own batch costs. The carinderia lunch economics guide develops the broader distinction between committed costs, sales and profit.

Check demand before assigning kitchen time

Record several comparable services before changing the menu. Use each batch’s actual contribution and occupancy, and compare the schedule as a whole. If summarising several batches, total contribution divided by total burner-minutes gives a weighted result; an average of unlike batch ratios can mislead. The two-burner breakfast-service guide provides a concrete planning example in which sequence and holding also matter.

What this calculation can and cannot decide

A capacity ratio cannot justify undercooked food or unsafe holding. Keep cooked food hot at 60°C or above, or chill promptly in shallow containers; refrigerate within two hours, or one hour above 32°C. Fixed costs and owner work still need to be covered by the business even when excluded from the short-term contribution ranking. Source 1 Source 2