Most bakers obsess over flour and butter costs while completely ignoring the energy bill. Your oven runs all day, burning through kilowatts with every batch of croissants. The difference between profitable bakeries and struggling ones? They calculate the true cost per product, including every minute of baking time.
Why include energy costs?
Your oven's meter keeps spinning every single minute you're baking. For most bakeries, energy costs eat up 4% to 7% of total revenue. Sounds small? On €300,000 annual turnover, that's €15,000 walking out the door.
💡 Example:
Bakery with €300,000 annual turnover:
- Energy costs 5% = €15,000 per year
- Divided across 50,000 products per year
- Average energy cost per product: €0.30
On a croissant priced at €1.50, that's 20% of your selling price!
Calculate your oven energy costs per hour
You need your oven's power rating and current energy rate. Check the manufacturer's plate on your oven - it'll show kilowatts (kW).
Formula: Cost per hour = (Power in kW × Energy price per kWh)
💡 Example calculation:
Convection oven 15 kW, energy price €0.35 per kWh:
- 15 kW × €0.35 = €5.25 per hour
- Per minute: €5.25 ÷ 60 = €0.0875
20 minutes of baking costs €1.75 in energy
Calculate energy cost per product
Now split those costs across everything in your oven. Pack it full - empty space costs the same to heat but generates zero revenue. This is the kind of thing you only learn after closing your first month at a loss.
Formula: Energy cost per product = (Cost per minute × Baking time) ÷ Number of products in oven
💡 Example croissants:
Batch of 48 croissants, 20 minutes at 180°C:
- Total energy cost: €0.0875 × 20 = €1.75
- Per croissant: €1.75 ÷ 48 = €0.036
Each croissant costs €0.036 in energy
⚠️ Note:
Don't forget preheat time! A cold oven burns 15-30 minutes reaching temperature. Split these costs across your morning's first batch.
Different products, different costs
Each recipe demands its own time and temperature. Map out your standard processes:
- Bread: 25-35 minutes at 220°C
- Croissants: 15-20 minutes at 180°C
- Cookies: 8-12 minutes at 160°C
- Cakes: 45-60 minutes at 170°C
Higher temps burn more energy. Longer times too. Smart bakers sequence their production: start with high-heat bread, then drop croissants into the residual heat.
Energy costs in your total cost price
Add energy costs to ingredient costs for your real cost price per product.
💡 Complete cost price croissant:
- Ingredients (flour, butter, yeast): €0.28
- Energy costs (20 min baking): €0.036
- Packaging: €0.02
Total cost price: €0.336
At selling price €1.50 excl. VAT (€1.64 incl. 9% VAT): food cost 22.4%
Save on energy costs
Small changes deliver massive savings:
- Schedule smartly: Bake continuously, capture residual heat
- Fill every rack: Half-empty ovens destroy margins
- Maintain equipment: Clean ovens run 15% more efficiently
- Check door seals: Heat leaks cost real money
Some food cost calculators track energy costs per recipe automatically, so you'll always know your true cost including every kilowatt.
How do you calculate energy costs in cost price? (step by step)
Measure the power of your oven
Find the power rating in kW (kilowatt) on the nameplate. Multiply this by your energy rate per kWh to get the cost per hour. For example: 15 kW × €0.35 = €5.25 per hour.
Calculate costs per baking session
Divide the hourly costs by 60 to get costs per minute. Multiply by the baking time of your product. At €5.25 per hour and 20 minutes of baking: (€5.25 ÷ 60) × 20 = €1.75 per baking session.
Divide across number of products
Divide the cost per baking session by the number of products in the oven at the same time. At €1.75 for 48 croissants: €1.75 ÷ 48 = €0.036 energy cost per croissant. Add this to your ingredient costs.
✨ Pro tip
Monitor your oven's actual energy draw with a smart meter for 14 days - most ovens consume 12-18% more power than their rated capacity due to heat cycling and door openings.
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
Should I also include preheat time in the calculation?
Absolutely, especially for your first batch. A cold oven burns 15-30 minutes reaching temperature. Divide these costs across your morning's first baking session, or calculate an average daily preheat cost.
What about other equipment like mixers and refrigerators?
For continuous equipment like cooling, spread costs across your total daily production. For mixers and prep equipment, use 0.5-1% of ingredient costs as a rough estimate.
Does energy cost vary by season due to different rates?
Energy rates fluctuate constantly. Check your invoice quarterly and adjust calculations accordingly. Many bakeries use annual averages to keep pricing stable throughout the year.
How accurate should I be with oven capacity calculations?
Track your standard batch sizes for each product type. Don't calculate for theoretical maximum capacity - use your actual production patterns. Most bakeries run ovens at 75-85% capacity on average.
📚 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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