Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Waste as % of food cost
5.9%
Annualized waste cost
$10,200
Annual savings if cut to 5%
$1,500
Waste this period
$850
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How to use this
- 1Enter waste/spoilage/comp value (period) ($).
- 2Enter total food purchases (same period) ($).
- 3Enter periods per year (12=monthly, 52=weekly).
- 4Read your waste as % of food cost on the right — it updates as you type.
- 5Hit Share to keep the scenario or send it to someone.
About this calculator
Food waste percentage measures the dollar value of spoiled, over-prepped, trimmed, or comped food against total food purchased in the same period. A well-run kitchen runs waste at 4-6% of food cost; anything above 10% signals a real problem in ordering, prep par levels, or receiving discipline. This includes spoilage from over-ordering perishables, trim loss beyond expected yield, kitchen errors that get remade, and manager comps for service recovery. This calculator takes your total waste dollar value logged during a period and your total food purchases for that period, and returns the percentage along with an annualized dollar impact, which tends to get attention from ownership faster than a percentage does. Reducing waste from 8% to 5% on a restaurant buying $300,000 in food annually saves $9,000 a year with zero menu or price changes — that's often easier money than trying to win new customers.
Worked example
Using the values the calculator loads with:
Inputs
- Waste/spoilage/comp value (period): 850 $
- Total food purchases (same period): 14500 $
- Periods per year (12=monthly, 52=weekly): 12
Results
- Waste as % of food cost: 5.9%
- Annualized waste cost: $10,200
- Annual savings if cut to 5%: $1,500
- Waste this period: $850
What each field means
Inputs
- Waste/spoilage/comp value (period) ($)
- The waste/spoilage/comp value (period) used in the calculation, measured in $. Starts at 850 $ so you have a working example on load.
- Total food purchases (same period) ($)
- The total food purchases (same period) used in the calculation, measured in $. Starts at 14500 $ so you have a working example on load.
- Periods per year (12=monthly, 52=weekly)
- The periods per year (12=monthly, 52=weekly) used in the calculation. Starts at 12 so you have a working example on load. Accepted range: 1–52.
Results
- Waste as % of food cost
- Returned as a percentage and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Annualized waste cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Annual savings if cut to 5%
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Waste this period
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What should I include as waste?
Spoiled or expired inventory, trim loss beyond the recipe's expected yield, prep mistakes that get discarded or remade, and manager comps for service issues. Do not include planned staff meals if those are tracked as a separate line — mixing them inflates the number and hides the real problem.
What's a realistic target?
4-6% of total food cost is standard for a well-managed kitchen. High-waste categories like fresh seafood, produce, and dairy naturally run higher than shelf-stable dry goods, so look at waste by category, not just the blended total.
How do I start tracking this if I never have?
Keep a simple waste log at the trash and comp point for two weeks — item, quantity, reason, estimated cost. Two weeks of real data is usually enough to spot the one or two categories driving most of the loss.
Does over-portioning count as waste?
Yes, and it's often the biggest hidden category. A protein portioned 1oz heavy on every plate doesn't show up as spoilage but has the same effect on food cost — audit portion sizes against the recipe spec regularly.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
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Ingredient Price Increase Impact Calculator
See how a supplier price hike hits food cost % and what to do about it.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Food Waste Percentage Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/waste-percentage-calculator
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/waste-percentage-calculator" target="_blank" rel="noopener">Food Waste Percentage Calculator — RevenueLab</a> (2026).</p>
Source: [Food Waste Percentage Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/waste-percentage-calculator) (2026).