Free Recipe Converter: Scale Any Recipe Up or Down
Halve, double, or resize any recipe instantly — convert between serving sizes or scale by multiplier, with smart fraction rounding for kitchen-friendly amounts. Free, no sign-up.
One ingredient per line, like 2 cups flour or 1/2 tsp salt. Fractions work too. Pro tip: put ## before any extra number on a line to scale it as well — e.g. 1 cup sugar (##200 g).
Your recipe stays in your browser — nothing is uploaded or stored.
How to Use This Recipe Converter
- Choose By servings to convert between serving sizes (24 → 12), or By multiplier to scale directly (2×, ½×).
- Type or paste your ingredient list, one ingredient per line, with amounts — for example 2 cups flour or 1/2 tsp salt.
- Keep smart fraction rounding on for kitchen-friendly amounts, and tick the box to see the original recipe side by side.
- Press Convert recipe — the scaled recipe appears instantly. Copy it, print it, or tweak the numbers live.
About the Recipe Converter
A recipe converter — also called a recipe conversion calculator, recipe calculator, recipe divider, recipe multiplier, recipe halfer, or serving sizer — is a kitchen tool that multiplies, divides, portions, or scales any recipe to the yield or serving size you want. It takes the guesswork out of recipe conversion: instead of recalculating every ingredient by hand, you enter the list once and get a perfectly scaled recipe in seconds.
- Scale by servings (4 → 8) or by direct multiplier (2×, 0.5×).
- Smart fractions turn decimals into clean amounts like 1/2 cup instead of 0.5 cups.
- Handles fractions, mixed numbers, decimals, ranges, and mid-line amounts with the ## operator.
- Works as a recipe halfer, recipe doubler, recipe divider, and recipe reducer — one tool, every direction.
- Side-by-side view shows the original and converted recipe together for easy checking.
- Free, instant, and private: everything runs in your browser with no sign-up.
Perfect Recipe Scaling Every Time
Cooking for two tonight and twelve tomorrow? This recipe adjuster removes the arithmetic so every batch comes out right. Here is what accurate recipe conversion buys you:
- Zero math mistakes. One multiplier applies to every ingredient, so nothing gets skipped or miscalculated.
- Cook for any crowd. Scale a weeknight dinner for the family or a holiday feast for twenty with equal ease.
- Halve with confidence. The built-in recipe halfer shrinks big-batch recipes for small households without waste.
- Meal-prep and batch cook. Triple the soup on Sunday and portion it for the whole week.
- Waste less food. Make exactly what you need instead of guessing and throwing extras away.
- Bake more precisely. Turn off fraction rounding for exact decimal amounts when a cake demands precision.
Who Is This Recipe Resizer For?
Powerful Features for Recipe Conversion
How to Scale a Recipe
What is a recipe converter, really?
A recipe converter is a recipe conversion calculator that resizes every ingredient in a recipe by the same ratio. You tell it where you are — a recipe that serves 8 — and where you want to be — dinner for 3 — and it rewrites the ingredient list with the new amounts. Cooks also call it a recipe calculator, a recipe adjuster, a recipe resizer, or a serving sizer, but the job is always the same: keep the proportions identical while the total changes. The tool on this page does it instantly and free, with no account and no waiting. Paste the ingredients, pick servings or a multiplier, and the scaled recipe appears below the tool, ready to copy or print.
The math behind recipe conversion: one multiplier for everything
Every recipe conversion runs on a single formula. In portion mode the multiplier equals desired servings ÷ original servings. Scaling from 4 servings to 8 gives 8 ÷ 4 = 2, so each ingredient doubles. Scaling from 8 servings to 6 gives 6 ÷ 8 = 0.75, so each ingredient drops to three quarters. In multiplier mode you skip the division and set the factor yourself: 2× to double, 0.5× to halve, 3× to triple. The calculator then multiplies every quantity by that one number. That is the whole secret of a recipe conversion calculator — one ratio, applied evenly, so the dish tastes exactly the same at any size. Understanding the formula also helps you sanity-check the result: if the factor is 2, every amount should look roughly twice as big.
Halving, doubling, and everything between
The most-searched recipe conversions are also the simplest. A recipe halfer cuts a recipe in half — factor 0.5 — perfect when a casserole serves eight but you cook for four, or when you want to test a new dish before committing to a full batch. A recipe doubler runs the factor at 2, the classic move for potlucks, holidays, and meal prep. A recipe divider or recipe reducer shrinks recipes by any ratio, and a reduce recipe calculator workflow — original servings, desired servings, convert — handles the awkward cases like 5 servings to 2. Odd ratios are where people actually need the tool: 6 → 4 is 0.67×, and nobody wants to multiply 3/4 cup by 0.67 in their head. Let the recipe resizer do it, then round to the nearest 1/8 for amounts you can actually measure.
Smart fractions and kitchen-friendly numbers
Raw multiplication produces ugly decimals — 1.333 cups, 0.1875 teaspoons — that no measuring cup understands. Smart fraction rounding fixes that by snapping every scaled amount to the nearest common cooking fraction, the nearest 1/8th, so 1.333 cups becomes 1 3/8 cups and 0.1875 teaspoons becomes 1/4 teaspoon. This recipe calculator shows clean amounts like 1/2 cup instead of 0.5 cups, which is exactly how recipes are written. Two details matter. First, tiny amounts round up to a minimum of 1/8, so a whisper of spice never rounds down to zero and vanishes from the dish. Second, turn rounding off for baking: cakes, breads, and pastries reward exact decimal amounts, and a gram scale beats a fraction when precision counts. The toggle sits right above the ingredient box for that reason.
What scaling does not change: time, temperature, and pan size
Here is the honest limit of every recipe conversion tool, including this one. The calculator scales ingredients — it does not scale physics. Doubling a cake batter does not double the baking time; it increases it modestly, so start checking early. Halving a roast does not halve the oven temperature; keep the heat the same and pull the dish when it looks and smells done. Yeast, baking powder, salt, and spices also deserve judgment at extreme scales: tripling the yeast in bread dough can over-proof it, and doubling the salt in a stew can overshoot because evaporation does not double with it. Treat the converted ingredient list as precise, then let your eyes, nose, and thermometer finish the job. When you scale a recipe up a lot, use a bigger pan — a doubled batter in the same tin bakes unevenly no matter how perfect the math is.
Pro tips for perfect recipe scaling every time
A few habits separate smooth conversions from kitchen surprises. Write quantities at the start of each line — 2 cups flour, not flour, 2 cups — so the parser catches every amount. Use the ## operator for numbers tucked inside a line: 1 cup sugar (##200 g) scales the grams along with the cups, and 3 to ##4 eggs scales a range properly. Season at the end when scaling up strongly flavored ingredients; add the converted amount of salt and spice, taste, then adjust. Weigh when it matters: for baking, convert the scaled volumes to grams with a kitchen scale for the most repeatable results. Check the side-by-side view before you cook — one glance at the original next to the converted recipe catches typos in your input. And save the converted version with the copy button, so next time you cook for that crowd size the work is already done.
Why cooks keep a recipe conversion calculator bookmarked
Recipes are written for an imaginary average household, but nobody cooks for an average. You cook for two on Tuesday and twelve on Sunday; you halve the experimental curry and triple the soup that everyone begs for. A fast, free recipe converter turns all of that into a ten-second task instead of a math worksheet. The jobi99 recipe converter goes further than basic scalers: it understands fractions, mixed numbers, decimals, and ranges, rounds to real cooking fractions, and shows the original beside the scaled recipe so you always trust the output. Bookmark this page and the next time a recipe says “serves 8” while your table seats 3, you will already be done. For more kitchen math, explore the recipes and cooking guides on jobi99.com.
Recipe Converter: Frequently Asked Questions
How do I format my ingredient list?
Type or paste your ingredient list with each ingredient on its own line, starting with the quantity: 2 cups flour, 1/2 tsp salt, 3 eggs. The smart parser understands whole numbers, decimals, fractions like 1/2, mixed numbers like 1 1/2, and ranges like 3 to 4. Lines without a quantity, such as “salt to taste,” pass through unchanged.
What is the difference between multiplier and portion conversion?
Multiplier conversion scales by a factor you set directly — 2× doubles, 0.5× halves, 3× triples — with one-tap presets for the common cases. Portion conversion asks for the original and desired serving sizes (for example, 4 servings to 6 servings) and calculates the multiplier for you automatically. Both produce the same scaled recipe; portion mode just does the division step.
How does the smart fraction feature work?
The smart fraction feature converts each scaled decimal to the nearest common cooking fraction, rounding to the nearest 1/8th. So 1.333 cups becomes 1 3/8 cups and 0.5 cups displays as 1/2 cup — amounts you can actually measure. Anything smaller than 1/8 rounds up to 1/8 so tiny amounts never disappear. Turn it off for baking when you want exact decimal measurements instead.
Can I see my original recipe and the converted one side by side?
Yes. Tick “Include original recipe in conversion” and the results show the original ingredient list next to the scaled recipe ingredients, so you can verify every amount at a glance before you start cooking.
How can I save or print my converted recipes?
Press Copy result to copy the scaled recipe to your clipboard and paste it into your notes or recipe app, or press Print for a clean kitchen-friendly printout. You can also bookmark this page to return to the converter anytime.
How accurate are the recipe conversions?
The math is exact: every quantity is multiplied by the same factor, so the proportions stay perfect for volume, weight, and count-based ingredients. What the tool cannot adjust is cooking time, oven temperature, or pan size — check those with your judgment, especially when doubling or tripling baked goods.
Can I convert recipes with mixed measurement units?
Yes. The recipe converter handles cups, tablespoons, teaspoons, ounces, grams, and count-based amounts like eggs or cloves in the same list, keeping each ingredient’s original unit while scaling its quantity. For a number tucked inside a line — like 1 cup sugar (##200 g) — put ## before it and that amount scales too.