HomeCasa Scale a recipe up or down and convert units and pan sizes
Resize a recipe for more or fewer servings or a different pan, convert cups, grams and Celsius, and fix the times, salt and leavening that do not scale in a straight line. Designed for ChatGPT, Claude, Gemini and Microsoft Copilot. It includes 5 customizable variables and you can copy it for free in one click.
Beginner · Text · Pending editorial review
Prompt
Act as a cook and baker who resizes recipes accurately for any quantity.
Context:
- Original recipe (ingredients with amounts and steps): {{recipe}}
- Original servings or pan: {{original}}
- Servings or pan I need: {{target}}
- Measurement system I want: {{system}}
- Equipment available: {{equipment}}
Deliverables:
1. The scaling factor, calculated and explained (by servings, or by pan area or volume, as appropriate).
2. An ingredient table: original amount, scaled amount and amount converted to the chosen system, rounded to practical kitchen measures.
3. Non-linear adjustments: salt, spices, yeast or baking powder, cooking liquids and baking time, explaining why and how much to adjust.
4. How to handle awkward amounts (for example 1.5 eggs) without ruining the recipe.
5. Changes to the steps: pans, batches, temperature and cues that show it is done.
6. A final version of the recipe ready to cook.
Constraints:
- Show the math so I can check it; for baking, favor weight in grams over cups.
- If a conversion depends on the ingredient (a cup of flour does not weigh the same as a cup of sugar), say so and label approximate equivalents as approximate.
- For meat, fish or egg dishes, remind me to check it is fully cooked when size or time changes.
- If something is missing (such as pan size), ask me before calculating.
Format: a conversion table followed by the final recipe with numbered steps.How to use it
Paste the full recipe and include the pan size if it is a baked good. Read the non-linear adjustments and, the first time, start checking the oven a few minutes before the stated time.
Usage example
Recipe: European brownie in grams and °C · Original: 20 × 20 cm pan · Target: 9 × 13 in pan · System: US cups and °F.
Sample output
1. Scaling factor (by pan area)
(6 ÷ 9)² = 36 ÷ 81 = 0.44. A 6-inch pan holds a little less than half of a 9-inch pan.
2. Ingredient table
| Ingredient | Original | × 0.44 | Practical measure |
|---|---|---|---|
| Cream cheese | 24 oz | 10.7 oz | 10.5 oz (about 300 g) |
| Heavy cream | 3/4 cup | 0.33 cup | 1/3 cup |
| Eggs | 4 | 1.78 | 2 large eggs |
| Sugar | 3/4 cup | 0.33 cup | 1/3 cup (about 65 g, approximate) |
| Flour | 1 tbsp | 1.3 tsp | 1¼ tsp |
3. Non-linear adjustments
- Time: the depth stays similar, so time drops only a little. Start checking at about 40 minutes.
- Convection: if the original 325 °F was for a conventional oven, lower to about 300 °F and keep an eye on browning.
4. Awkward amounts
For more precision, beat 2 eggs and leave out roughly 1 tablespoon.
5. Done cues
Edges set, center jiggles slightly when you nudge the pan. Make sure the eggs are fully set…
Key facts
- Category
- Cooking · Recipes
- Output type
- Text
- Level
- Beginner
- Designed for
- ChatGPT, Claude, Gemini and Microsoft Copilot
- Verified in
- Pending editorial verification
- Variables
- Original recipe, Original servings or pan, Servings or pan I need, Measurement system and Equipment
- Language
- English
- Price
- Free, no sign-up
- Updated
- Nov 7, 2026
Frequently asked questions
Can I just multiply every ingredient?
Usually for the main ingredients, but not for salt, spices, leavening or baking time. The prompt flags those cases and explains how much to adjust.
How do I convert cups to grams accurately?
It depends on the ingredient, because each has a different density. The prompt gives approximate equivalents; for precise baking, a kitchen scale is the most reliable option.
What is this prompt for?
Resize a recipe for more or fewer servings or a different pan, convert cups, grams and Celsius, and fix the times, salt and leavening that do not scale in a straight line.
Which AI tools does it work with?
It is designed for ChatGPT, Claude, Gemini and Microsoft Copilot. We have not verified it in these tools yet, so results may vary between them.
How do I customize the prompt?
Click “Customize” and fill in the variables (Original recipe, Original servings or pan, Servings or pan I need, Measurement system and Equipment). The text updates instantly and you can then copy it in one click. Values are stored only in your browser.
Do I need experience to use it?
No. It is a beginner-level prompt: just fill in the details and paste it into your AI tool.
Is this prompt free?
Yes. Every HomeCasa Prompts prompt is free, with no sign-up or subscription. You can also use them in professional projects.
Can I trust the AI output?
Treat it as a high-quality draft: always check data, figures and important claims before publishing or making decisions.