Batch recipe multiplier calculator
Paste 2 cups flour, 1 cup sugar, 3 eggs, choose a multiplier of 2, and get 4 cups flour, 2 cup sugar, 6 eggs. Every line of the list is scaled by the same factor, with units and names left untouched. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Text
- 2 cups flour, 1 cup sugar, 3 eggs
- Multiplier
- 2
- Text
- 4 cups flour, 2 cup sugar, 6 eggs
- Original
- 2 cups flour, 1 cup sugar, 3 eggs
- Quantity
- 3
Home cooks, bakers, catering desks, and meal-prep planners often need one multiplier applied to an entire ingredient list when they cook a double batch, a half batch, or a tray for a crowd. Copying each line into a pocket calculator invites skipped items, broken ratios, and shopping lists that no longer match the method. This batch recipe multiplier calculator accepts a comma-separated ingredient list plus a single positive multiplier, reads the leading quantity on every line — including kitchen fractions such as 1/2 and mixed amounts such as 1 1/2 — multiplies each quantity by that factor, and returns a scaled list that keeps the original unit and name wording.
What a batch recipe multiplier does to a full list
A batch recipe multiplier applies one positive factor to every measured amount on a card so the finished yield grows or shrinks while the ratios stay the same. If the original list reads two cups flour, one cup sugar, and three eggs, a multiplier of two produces four cups flour, two cups sugar, and six eggs. That is the search people type when they want a batch recipe multiplier calculator rather than a servings-mode scaler or a tool that only doubles a single line.
The parser reads the leading quantity on each item — an integer such as 250, a decimal such as 1.5, a simple fraction such as 1/2, a mixed amount such as 1 1/2 or the hyphen form 1-1/2 used on many United States cards, or a common vulgar fraction — then multiplies that number by the one multiplier you supplied. The remainder of the item, including cups, grams, teaspoons, and the ingredient name, is copied through unchanged.
Zero quantities are allowed and stay zero after scaling, which is useful for optional lines you are omitting. Negative amounts and non-positive multipliers are rejected because a recipe batch never calls for a negative mass or a factor that would wipe or invert every line. Ranges such as two-to-three cups are also rejected: a single multiplier cannot honestly choose a point inside a range, so the task fails instead of silently taking the first number and leaving a broken label.
Where a batch list multiplier earns its keep
Catering desks walk a banquet card at multiplier four or six and send the scaled list to purchasing without retyping every line. Culinary schools use deterministic goldens in LMS auto-graders so students learn that batch scaling is exact multiplication of each leading quantity, not a vague scoop more. Failed validation is free.
Keep requests small, pin the text and items fields in tests, and you get a reproducible scaled list for widgets, edge workers, and kitchen tablets. This page owns the batch-recipe-multiplier search intent: one list in, one factor, a full scaled list out. When you need to change yield by original and target serving counts instead of a single factor, use a servings-aware recipe scaler.
When you only need to double one isolated quantity, use a dedicated double-a-recipe calculator. When the job is a pasted comma-separated list and one batch multiplier, this is the contract.
What you can do with it
Party and catering batch cards
Paste a comma-separated ingredient list from a four-person card, set multiplier to three or four, and print a scaled shopping list for a larger table.
Meal-prep and freeze-ahead lists
Scale a weekly prep list by 1.5 or 2 so two freezer trays share the same ratios without rewriting every line by hand.
FAQ
Which quantity formats does the batch recipe multiplier understand?
Integers, decimals, simple fractions such as 1/2, mixed amounts such as 1 1/2 or 1-1/2, and common vulgar fractions. Units and names after the number are copied through unchanged.
What happens if the multiplier is zero, negative, or missing?
A batch factor must be a finite positive number; zero or negative values would wipe or invert every quantity and are not billed.
Does this convert cups to grams or change units?
No. It only multiplies the leading quantity on each line. Keep your unit labels; use a separate unit converter if you need density-based conversion.
What happens with a range like two to three cups?
The list is refused until that line has a single amount. One multiplier cannot honestly pick a point inside a range, so the calculator stops rather than scaling only the first number and leaving a confusing label.
Can I paste a list with line breaks instead of commas?
Yes. Line breaks and semicolons also separate the items, so a card copied line by line works as well as a comma-separated list. Each item still has to start with its amount.
Related tools
For developers — API access
Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.
API endpoint
Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.
Call it from your stack
curl -X POST https://api.kit.forhosting.com/cook/scale-ingredient-list \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"text":"2 cups flour, 1 cup sugar, 3 eggs","multiplier":2}'const res = await fetch("https://api.kit.forhosting.com/cook/scale-ingredient-list", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"text": "2 cups flour, 1 cup sugar, 3 eggs",
"multiplier": 2
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/cook/scale-ingredient-list",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"text": "2 cups flour, 1 cup sugar, 3 eggs",
"multiplier": 2
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/cook/scale-ingredient-list", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"text":"2 cups flour, 1 cup sugar, 3 eggs","multiplier":2}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"text":"2 cups flour, 1 cup sugar, 3 eggs","multiplier":2}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/cook/scale-ingredient-list", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"text": "2 cups flour, 1 cup sugar, 3 eggs",
"multiplier": 2
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "cook.scale_ingredient_list",
"status": "queued",
"_links": {
"result": "/tasks/tsk_…/result"
}
}The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.
Pricing
Published price — no tokens, no invented credits. A failed task is never charged.
Limits
max_n | 200 |
max_chars | 20000 |
max_abs | 1000000000000 |
Errors
| HTTP | Code | Meaning |
|---|---|---|
401 | unauthorized | Missing or invalid API key. |
402 | insufficient_balance | Your balance doesn't cover the task price. |
404 | unknown_type | That task type doesn't exist. |
429 | rate_limited | Too many requests. Use the webhook instead of polling. |
Technical notes
Invalid multipliers and empty or unreadable lists fail with invalid_input and are not billed.
What a batch recipe multiplier does to a full list
This capability is built around a pasteable comma-separated ingredient list: you keep units and names in the same string as the number, exactly as a recipe card already writes them.
Input contract, parsing rules, and error behaviour
Each item must start with a parseable quantity. A number may sit against its unit with no space, so 250g flour is valid and becomes 500g flour at multiplier two. Kitchen fractions in the output stay readable: one half times three is written 1 1/2, not a long decimal. Lists longer than two hundred items or twenty thousand characters are rejected. POST a JSON body with two required fields. text is the comma-separated ingredient list; aliases list, ingredients, items, and content are accepted so forms and scripts can use the name they already have. Newlines and semicolons also split items, which helps when a pasted card uses line breaks instead of commas. multiplier is the positive finite batch factor; aliases factor, scale, and times are accepted. On success the body includes text, the reassembled scaled list you can copy back onto a card; original, the trimmed source; multiplier, echoed and rounded; count, the number of items; items, a per-line breakdown with index, original, quantity, scaled, an optional label for the unit-and-name remainder, and line, the formatted scaled item; formula, scaled_i equals quantity_i times multiplier; and a short message. If text is missing or empty, if any item has no leading quantity, if the list contains a blank slot from a double comma, or if multiplier is missing, zero, negative, or not a finite number, the task fails with invalid_input naming the problem and does not consume balance. Pair this endpoint with a unit converter when you need cups to grams; this calculator only scales the numbers you already trust and does not change density or unit systems.
Where a batch list multiplier earns its keep
Cloud functions that rebuild family cookbooks from JSON cards need a tiny, network-free primitive that never drifts between preview and production.
Integration use cases
Blog widgets and LMS checks
Embed a free batch recipe multiplier that matches API goldens so readers and students get the same scaled list every time.
Technical questions
How do I scale a comma-separated ingredient list by one multiplier?
Send text (aliases list, ingredients, items) and a positive multiplier (aliases factor, scale, times). Each item must start with a quantity. The API returns the scaled list in text and a per-line breakdown in items.
What does the batch recipe multiplier calculator cost?
The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.