Soup Calculator
Scale soup recipes to any number of servings and estimate the broth you need, so your pot always matches the number of people you are feeding.
Scaled ingredient
750 g
4 → 6 servings
Broth / water estimate
1,500 ml
≈ 250 ml liquid per serving
Scale each ingredient of the recipe by the same factor: amount × target servings ÷ original servings.
Last updated: May 2026
How this calculator is verified
Checked by True Calculator automated test suite on
- Formula verified against a published worked example in the automated test suite
- Edge cases (zero, negative, boundary and unit-mismatch inputs) covered by unit tests
The full verification method is on our how we verify page. Found an error? Tell us and we will re-check it.
When to Use This Calculator
Use this calculator when a soup recipe never matches the number of people you are actually feeding. Hosting a larger dinner, cooking for a joint family where portions vary, or halving a big batch for a single serving all come down to the same ratio. The tool also helps budget planning: scale the ingredient cost by the same factor to estimate what a bigger pot will set you back. The broth estimate is handy for dal-based and vegetable soups common in Indian kitchens, where the liquid ratio decides whether you get a thick stew or a clear broth. With the arithmetic done, you can concentrate on the stove instead of the calculator.
How to Use This Calculator
- Step 1: Note how many servings your current soup recipe makes.
- Step 2: Enter the amount of the ingredient you want to scale, in grams.
- Step 3: Enter how many servings you actually need — more or fewer than the recipe.
- Step 4: Read the scaled amount and the suggested broth volume, and adjust seasoning to taste.
Worked Example
Your recipe serves 4 and uses 500 g of mixed vegetables. You are cooking for 6, so enter 500 g, 4 servings and 6 servings. The calculator applies 500 × 6 ÷ 4 = 750 g, and suggests about 250 ml of liquid per serving, or 1500 ml of broth for six bowls. Scaling down works the same way: a 250 g ingredient from a 4-serving recipe becomes 500 g when you cook for 8, or 125 g if you drop to 2 servings.
Tips and Common Mistakes
- •Tip 1: Scale every solid ingredient by the same factor so the soup keeps its balance.
- •Tip 2: Start with about 250 ml of liquid per serving and add more if it thickens too much.
- •Tip 3: Add salt and strong spices near the end — a big batch is easy to over-season.
- ✗Mistake 1: Avoid scaling cooking time with servings — only ingredients scale; simmering time stays similar.
- ✗Mistake 2: Don't double the salt automatically; taste as the pot cooks instead.
Sources and References
- •Ratio-based scaling — On Food and Cooking by Harold McGee
Official sources are linked so you can confirm the current rate yourself. Check the linked page for the latest notification before relying on these figures.
Frequently Asked Questions
How do I scale a soup recipe for more people?
Multiply every ingredient by the ratio of new servings to original servings. If a 4-serving recipe uses 500 g of vegetables, 6 servings need 500 × 6 ÷ 4 = 750 g.
How much liquid should a soup have?
A practical starting estimate is about 250 ml of water or broth per serving. Six servings therefore need roughly 1500 ml, which you adjust for how thick or thin you like the soup.
Can I scale a recipe down to fewer servings?
Yes — the same ratio works in reverse. Enter a smaller target than the original and the ingredient amounts shrink proportionally, keeping the seasoning balance intact.
Should spices be scaled by the same factor?
Mostly yes, but salt and strong spices are better added to taste near the end. Scaling them blindly can over-salt a big batch, so the calculator treats every ingredient equally and you adjust by taste.
Does doubling a soup really work like doubling a cake?
More easily, yes. Soups are forgiving — simmering time does not double, only the ingredient amounts do. The calculator handles the arithmetic so you can focus on the pot.
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