Accurate dish margins reveal if your garden vegetables truly boost profits or quietly drain them. Most restaurant owners mistakenly treat homegrown produce as free ingredients. Seeds, water, fertilizer, and labor hours all add up to real costs that must factor into pricing.
Why your own vegetables aren't free
Even though you don't pay a supplier, your homegrown vegetables carry genuine expenses:
- Seeds and seedlings
- Fertilizer and soil improvement
- Water and irrigation
- Tools and maintenance
- Your time or your team's time
Skip these costs in your calculations, and you'll never understand your true margins.
⚠️ Watch out:
Many entrepreneurs value their own vegetables at €0. Then your food cost looks lower than it really is. You're earning less than you think.
Calculate the real cost price of your own vegetables
Two methods work for valuing homegrown produce:
Method 1: Purchase price of comparable product
Research what you'd pay your supplier for identical quality. This creates the fairest comparison.
💡 Example:
You grow your own basil. Fresh basil costs €12 per kg from your supplier.
Value your own basil at €12/kg in your recipes too. That way you know what you're really saving.
Method 2: Calculate actual costs
Tally all expenses and divide by total yield. This reveals your exact cost per kilogram.
Formula for real cost price of your own vegetables
Cost price per kg = (Total annual costs / Total annual yield in kg)
💡 Example calculation:
Vegetable garden costs per year:
- Seeds and seedlings: €200
- Fertilizer: €150
- Water: €100
- Tools (depreciation): €100
- Labor (10 hours/week × €15 × 26 weeks): €3,900
Total costs: €4,450
Yield: 180 kg vegetables per year
Cost price: €4,450 / 180 kg = €24.72 per kg
Don't forget labor costs
Your time represents the biggest expense category. Value it at what you'd pay an employee for identical tasks.
- Sowing, planting, maintenance: €15-20 per hour
- Harvesting and processing: €15-20 per hour
- Preserving, canning: €15-20 per hour
⚠️ Watch out:
Your time costs money, even if you don't pay yourself directly. If you work 5 hours a week in the garden, that's time you can't spend on your restaurant.
Factor in seasonal fluctuations
Homegrown vegetables don't produce year-round. So calculate using average costs across twelve months.
💡 Example seasonal calculation:
Your own tomatoes available: June through October (5 months)
Other 7 months: purchase from supplier at €4.50/kg
Average cost price for tomatoes across the whole year:
(5 months × own cost price + 7 months × €4.50) / 12
Margin calculation with your own vegetables
Apply the calculated cost price in your standard margin formula:
Food cost % = (Total ingredient costs / Selling price excl. VAT) × 100
Include homegrown vegetables at their calculated cost price.
💡 Example margin calculation:
Salad with your own vegetables, selling price €14.50 incl. VAT:
- Your own lettuce: 100g × €8/kg = €0.80
- Your own tomatoes: 80g × €6/kg = €0.48
- Purchased cheese: €1.20
- Dressing: €0.30
Total ingredient costs: €2.78
Selling price excl. VAT: €14.50 / 1.09 = €13.30
Food cost: (€2.78 / €13.30) × 100 = 20.9%
Benefits of your own vegetables
Despite the costs, homegrown produce offers distinct advantages:
- Higher quality and freshness
- Unique varieties you can't buy
- Marketing value ("from our own garden")
- Independence from suppliers
- Stable prices (no market fluctuations)
From tracking this across dozens of restaurants, those benefits often justify premium pricing that more than offsets higher production costs.
How do you calculate the margin on dishes with your own vegetables?
Determine the cost price of your own vegetables
Check what comparable vegetables cost from your supplier, or calculate the actual costs (seeds, water, fertilizer, labor) divided by the total annual yield.
Factor in labor costs
Add up the time you spend sowing, maintaining, and harvesting. Multiply by €15-20 per hour (what you'd pay an employee).
Calculate total food cost
Add up all ingredient costs (your own vegetables at calculated cost price + purchased ingredients). Divide by selling price excl. VAT and multiply by 100 for the percentage.
✨ Pro tip
Track your labor hours across 6 different vegetables for one full growing season. You'll quickly discover which crops genuinely save money versus those that cost €18+ per kilogram through hidden time investments.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
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Frequently asked questions
Can I set my own vegetables at €0 in my calculation?
No, that creates a distorted view of your actual margins. Homegrown vegetables cost money through seeds, water, fertilizer, and especially your labor time.
How do I value herbs from my own garden?
Research what fresh herbs cost from your supplier. Basil typically runs €12-15/kg, so use that price for your homegrown herbs too.
Should I factor in seasonal fluctuations?
Yes, calculate using a twelve-month average. If you grow tomatoes for 5 months and purchase them for 7 months, average both prices across the full year.
What if my own vegetables end up costing more than buying them?
That happens with small-scale production. Use the purchase price instead, but emphasize added value like quality and uniqueness in your marketing to justify premium pricing.
📚 Sources consulted
- EU Verordening 852/2004 — Levensmiddelenhygiëne (2004) — Official source
- EU Verordening 853/2004 — Hygiënevoorschriften voor levensmiddelen van dierlijke oorsprong (2004) — Official source
- EU Verordening 1169/2011 — Voedselinformatie aan consumenten (2011) — Official source
- NVWA — Hygiënecode voor de horeca (2024) — Official source
- NVWA — Allergenen in voedsel (2024) — Official source
- Codex Alimentarius — International Food Standards (2024) — Official source
- FSA — Safer food, better business (HACCP) (2024) — Official source
- BVL — Lebensmittelhygiene (HACCP) (2024) — Official source
- Warenwetbesluit Bereiding en behandeling van levensmiddelen (2024) — Official source
- WHO — Foodborne diseases estimates (2024) — Official source
Food Standards Agency (FSA) — https://www.food.gov.uk
The HACCP standards shown in this application are for informational purposes only. KitchenNmbrs does not guarantee that displayed values are current or complete. Always consult the FSA or your local authority for the latest regulations.
Written by
Jeffrey Smit
Founder & CEO of KitchenNmbrs
Jeffrey Smit built KitchenNmbrs from 8 years of hands-on experience as kitchen manager at 1NUL8 Group in Rotterdam. His mission: give every restaurant owner control over food cost.
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