What is my recipe in percent by weight, and how do I scale it?

Weigh every ingredient, add the weights, and divide each one by the total. That share times 100 is its percent by weight. To scale, multiply each percent by the batch size you want. An ingredient weighing 454 g in a 1,011 g test batch is 44.91 percent of it, so a 20 kg batch needs 8,981 g. This calculator does that for every line, adds up the salt and the acid your vinegar brings, and gives you the formula in the form a process authority asks for. Washington State University's evaluation, for one, wants the recipe by weight and by percentage, kept all in grams or all in ounces [1].

Turning a kitchen recipe into weights

1. Make the recipe once more with a scale under the bowl. Tare the scale, add one ingredient, write the number, tare again. Cups and "two cloves" are what you are getting rid of.
2. Weigh produce as it goes in. Stemmed peppers, peeled garlic, trimmed carrot. Trim and stems never reach the sauce, so they do not belong in the formula.
3. Weigh liquids too. A cup of vinegar and a cup of water do not weigh the same, and neither weighs the same as a cup of honey. Grams avoid the question.
4. Pick one unit and stay in it. The calculator accepts grams, kilograms, ounces and pounds on each line and converts everything to grams (28.34952 g per ounce [5], 16 ounces to the pound [4]), but the formula you send out should use one unit throughout [1].
5. Mark the salt and the acids. Tick the salt line, and for each vinegar or other acid ingredient enter its acidity from the label. Ohio State Extension's sauce fact sheet asks for vinegar of at least 5 percent acetic acid, which the label may show as "50 grain" [3].
6. Enter the batch you want, as a weight or as a number of bottles.

A worked example with placeholder ingredients

The ingredients below are lettered on purpose. The weights show the arithmetic and are not a recipe. Enter your own formula in their place; unless it comes from a tested source or a process authority, it stays a refrigerator sauce.

The percent column adds to 100.01 because each line is rounded to two decimals; the calculator says so under the table rather than fudging a line. The scale factor here is 20,000 ÷ 1,011 = 19.7824.

Salt and acid in the example

The calculator reports two figures for the whole batch:

• Salt: 11 ÷ 1,011 = 1.09 percent.
• Acetic acid from ingredient B: 340 g × 5 percent = 17.0 g of acetic acid, and 17.0 ÷ 1,011 = 1.68 percent of the batch.

If you simmer the test batch and it weighs 920 g in the pot afterward, the calculator can also show both against the finished weight: 1.20 percent salt and 1.85 percent acid. That second pair assumes only water left the pot, which is an approximation. Use it for comparing versions of your own recipe; a process authority works from what the lab measures in your finished sauce.

For orientation, the USDA purchasing specification for hot sauce ranges from 1.2 to 12.0 percent salt and from 1.0 to 9.5 percent acidity as acetic acid across its ten styles [2]. Those are commercial specification figures, not safety limits, and acid as a percent of the batch is not pH. A sauce with plenty of vinegar can still read higher than you expect if it carries a lot of low-acid vegetable, which is why what pH hot sauce needs to be is measured, never calculated.

Scaling by bottles instead of by weight

If you know how many bottles you want, the calculator can work backward. Enter the number of bottles, the fill weight per bottle and the sauce you expect to lose in the kettle, filler and lines, and it sets the batch to:

bottles × fill weight + loss

For 120 bottles at 154 g each with 400 g of loss, that is 120 × 154 + 400 = 18,880 g. A two-ingredient formula at 80 and 20 percent then scales to 15,104 g and 3,776 g. To find your own fill weight and loss, use the yield calculator; it converts a declared 5 fl oz into grams once you have weighed a known volume of your sauce.

What the percentages tell you, and what they do not

They set the order of your ingredient list. Federal labeling rules list ingredients in descending order of predominance by weight [6], so the percent column is that order. In the example, ingredient A comes first and G last.

They make scaling a straight multiplication. Every line keeps its share at any size. What does not scale in a straight line is the cooking: a deep kettle heats and evaporates differently from a saucepan, so a 20 kg batch can finish thicker or thinner than the test batch. Scaling a recipe up covers checking the finished weight and pH after the first big batch.

They show where a small ingredient becomes a weighing problem. A thickener at a fraction of a percent is a few grams in a test batch. The calculator shows scaled weights under 100 g to 0.1 g so you can see when a line needs a finer scale than the one under your kettle.

They do not make a recipe safe. Percent by weight describes a formula. Whether that formula, made your way and bottled in your container, is safe on a shelf is a judgment a process authority makes from measurements.

Taking the formula to a process authority

The formula this calculator produces is the starting document for a scheduled process. Turning a recipe into a product formula explains what else belongs with it, from ingredient specifications to how you will hold the acid level batch to batch. When you are ready to send it, the process authority directory lists university services with their fees and turnaround as checked in October 2026.

References

1. Washington State University Food Processing Extension and Research, Product Evaluation, accessed October 22, 2026. https://foodprocessing.wsu.edu/extension/product-eval/
2. USDA Agricultural Marketing Service, Commercial Item Description A-A-20097G, Hot Sauce, July 12, 2019. https://www.ams.usda.gov/sites/default/files/media/AA20097GHotSauce.pdf
3. Ohio State University Extension (Nicole Arnold; originally by Abigail Snyder), Food Preservation: Making and Preserving Barbecue and Hot Sauces, HYG-5365, November 12, 2024. https://ohioline.osu.edu/factsheet/hyg-5365
4. Electronic Code of Federal Regulations, 21 CFR 101.7, Declaration of net quantity of contents, up to date as of October 20, 2026. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-101/subpart-A/section-101.7
5. Nebraska Department of Water, Energy, and Environment, "O" Conversion/Equivalency Factors, undated, accessed October 2026. https://dwee.nebraska.gov/state-energy-information/energy-statistics/miscellaneous/conversion-factors/o-conversionequivalency-factors
6. Electronic Code of Federal Regulations, 21 CFR Part 101 Subpart A (section 101.4, Food; designation of ingredients), up to date as of October 20, 2026. https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-101/subpart-A