You have 300 g of flour left, but the recipe uses 400 g. You can use that amount to find a smaller batch instead of guessing a serving count. BatchLadle applies one ratio to every measured row and keeps your original quantities for later edits.
Find the factor from one ingredient
Use the same unit and preparation on both sides: scale factor = amount to use ÷ original amount. Multiply every original ingredient quantity by that factor. The target serving count is original servings × scale factor. This follows the same proportional arithmetic as scaling by servings; it does not predict a cooking result.
Start with one complete recipe. A reference amount of zero, an unresolved line, or “to taste” cannot determine the factor. BatchLadle only offers measured rows whose original amount is greater than zero.
Example: 300 g of flour for a four-serving recipe
The original recipe below uses 400 g of flour for four servings. Using 300 g gives a factor of 300 ÷ 400 = 3/4 and a target of 4 × 3/4 = 3 servings. The other rows follow the same exact ratio. This is an arithmetic illustration, not a tested recipe.
| Ingredient | Original amount | Scaled amount |
|---|---|---|
| Flour | 400 g | 300 g |
| Water | 260 g | 195 g |
| Salt | 8 g | 6 g |
Use the ingredient option in Recipe scaler
Review the original recipe
Enter the original serving count and ingredient quantities. Resolve pasted lines that need confirmation. Keep preparation notes such as melted, sifted, or packed.
Choose an ingredient and amount
Open “Scale to an ingredient you have” below the serving controls. Select a measured row. The unit appears beside its name; enter the quantity in that same original unit, then choose “Use this amount”.
Inspect the whole batch
Check the target servings and all scaled rows. Fractional servings are allowed and exact fractions stay in the saved recipe. Decimal display may be rounded; use each row’s exact amount when needed.
Save and prepare
Save the recipe or download a JSON backup. Build a shopping list for the remaining ingredients. Before mixing, confirm your equipment can hold the new batch.
Match units before choosing the amount
If the original row is in grams, enter grams. If it is in kilograms, first express your available amount in kilograms or edit that original row consistently. Choosing a different result unit does not change the unit required by this control.
Cups and grams require an ingredient-specific reference. A publisher’s cup weight does not define every measuring cup, and packed and loose ingredients are different states. Use Ingredient converter first when you need a supported conversion. Avoid replacing an unknown density with water.
What if more than one ingredient is limited?
Calculate an available-to-original ratio for each limited ingredient in matching units. The smallest positive ratio is the largest proportional batch those listed amounts can support. For example, 300 g available from a 400 g flour row permits 3/4 of a batch, while 100 g available from a 200 g butter row permits 1/2. Butter limits this example to 1/2.
The control applies one selected ingredient at a time; it does not inspect your pantry or automatically optimize several limits. Recheck every other row after applying a factor.
A proportional amount still needs a cooking decision
Cooking time, fermentation, pan shape, and ingredient substitutions do not follow the serving multiplier automatically. BatchLadle retains your time instructions as notes. Use Pan size converter to compare internal dimensions and intended fill, then follow the recipe’s doneness checks.
Do not round a fractional egg silently or replace it with a different ingredient in the calculator. Decide how to measure it for that recipe and keep the decision in a row note. Very small or large batches may need a tested method or several batches.