Spice Scaling Calculator
Scale spice amounts when adjusting recipe servings.
Accounts for non-linear scaling of bold spices — strong seasonings should not simply double with servings.
Spice scaling adjusts seasoning quantities when increasing or decreasing a recipe’s yield. While most ingredients scale linearly (double the batch = double the ingredient), spices follow a non-linear scaling rule — strong spices like chili, cayenne, and black pepper are never doubled exactly when doubling a recipe, because their perceived intensity is disproportionate at higher concentrations.
Linear scaling formula (for most ingredients): Scaled Amount = Original Amount × (New Servings ÷ Original Servings)
Non-linear spice scaling (for everything with a real punch to it): Scaled Spice = Original Spice × (Scale Factor)^exponent
Where:
- Original Amount: the quantity in the original recipe
- New Servings: your target batch size
- Original Servings: the recipe’s intended yield
- Scale Factor: New Servings ÷ Original Servings
- Exponent: below 1 for anything strong, so the amount grows more slowly than the batch does
The exponent is a rule of thumb, not a law of nature. It comes from the same place every cook eventually arrives at after doubling a curry and finding it inedible. What it encodes is that perceived pungency rises faster than concentration, so matching the concentration overshoots the taste.
| Intensity | Examples | Exponent | Multiplier when doubling |
|---|---|---|---|
| Mild herbs | parsley, chives, basil, oregano | 1.00 | ×2.00 |
| Moderate | cumin, coriander, paprika, cinnamon | 0.85 | ×1.80 |
| Strong | black pepper, ginger, turmeric, nutmeg | 0.70 | ×1.62 |
| Very strong or hot | cayenne, chilli flakes, cloves | 0.60 | ×1.52 |
| Salt | — | 0.80 | ×1.74 |
Mild herbs sit at 1.00, which is ordinary linear scaling. They are on the list precisely because they are the exception: you can double the parsley and nothing bad happens.
The rule works in both directions. Halving a recipe and halving the cayenne with it leaves the dish tasting flat, because the same curve that says “less than double when doubling” says “more than half when halving”. At an exponent of 0.60, halving the batch means keeping about 66% of the chilli, not 50%.
Worked example: Original recipe serves 4, using 1 tsp cumin, ½ tsp cayenne, 2 tsp paprika and ¾ tsp salt. Scaling to serve 12, so the scale factor is 3.
- Cumin (moderate): 1 × 3^0.85 = 1 × 2.54 = ~2½ tsp
- Cayenne (very strong): 0.5 × 3^0.60 = 0.5 × 1.93 = ~1 tsp
- Paprika (moderate): 2 × 3^0.85 = 2 × 2.54 = ~5 tsp (1¾ tbsp)
- Salt: 0.75 × 3^0.80 = 0.75 × 2.41 = ~1¾ tsp
Straight multiplication would have asked for 3 tsp of cumin, 1½ of cayenne, 6 of paprika and 2¼ of salt. The cayenne is where you would have noticed.
Always taste and adjust at the end. These are starting points, not final answers.
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This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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