Doubling a recipe, or shrinking it down for a smaller gathering, means recalculating every single ingredient's quantity by the same ratio — easy to get wrong by hand once a recipe has more than a few ingredients.
This tool reads the leading number from each ingredient line, multiplies it by the ratio between your target and original serving counts, and rebuilds the ingredient list with the new scaled quantities, leaving the ingredient names and units untouched.
It works with whole numbers, decimals, and simple fractions written as decimals, covering the vast majority of recipe formats without requiring you to reformat your ingredient list first.
Because everything runs locally in your browser, results appear instantly and nothing you type or upload is ever sent to a server.
Bookmark this page if you expect to use this tool regularly — it loads fast and behaves the same way every time, with no account needed.
This kind of task shows up constantly in everyday writing, coding, design, and admin work, which is exactly why a dedicated, focused tool saves so much back-and-forth.
A tool that does one job well, without a cluttered interface or unrelated features competing for attention, tends to be faster to use than a heavier all-in-one app.
If you find yourself needing this conversion or calculation often, keeping this page open in a tab is usually faster than digging through a bigger software suite's menus.
Because there's no sign-up or installation step, you can jump straight from search result to working tool in a couple of seconds.
Frequently asked questions
Does this handle fractions like 1/2?
It works most reliably with decimal quantities (0.5 instead of 1/2); converting fractions to decimals first ensures accurate scaling.
What if an ingredient line doesn't start with a number?
Lines without a leading number (like "salt to taste") are passed through unchanged, since there's nothing to scale.