RUŌOD Lab

Level 5 · Perfume Mathematics and Formula Design

Percent to Grams: Study Guide and Batch Drill

Use our percent-to-grams guide, then work a batch sheet from a library formula, checking whether each line can actually be weighed on your scale.

Intermediate 15 min study By the RUŌOD Lab team Updated

In short

Converting a percentage formula to grams is simple multiplication. The practical problem is that some lines come out too small to weigh. The reference guide covers the conversion. This study guide adds the step that turns numbers into a batch you can actually make.

What you will learn

  • Turn a percentage formula into a batch sheet
  • Identify lines too small for your scale, and plan a stock for them

Before this lesson: Percent and Parts: Study Guide and Drill

What to look for as you read

  • The multiplication and how to check it.
  • How batch size interacts with your scale's limits.

Practical exercise: Write one batch sheet

About 25 minutes · You will have: a batch sheet with a weigh column and stock plan for any line under your scale's practical limit

  1. Choose a formula from the library, such as Fern Signal.
  2. Calculate grams for a 10 g batch for every line, with the total as a check.
  3. Mark any line under your practical minimum from your weighing practice.
  4. For each marked line, choose a stock strength, and calculate the stock weight and the solvent it adds.
  5. Write the final batch sheet in weighing order, with the largest lines first.

You have done this well if no weigh column entry is under your practical minimum, and you noted the added solvent. This is a paper exercise: you need not make the batch, and library formulas are not validated for wear.

Knowledge check

1. A line is 0.3% of a 20 g batch. How much do you weigh if it is neat?
Show the answer

0.06 g. 20 × 0.003 = 0.06 g. That is too small for a 0.01 g scale, so use a stock.

2. How do you weigh that 0.06 g from a 10% stock?
Show the answer

0.6 g of stock. 0.06 ÷ 0.10 = 0.6 g of stock, which is readily weighable.

3. What else does using that stock change?
Show the answer

It adds 0.54 g of solvent to the batch. 0.6 g of stock is 0.06 g of material and 0.54 g of solvent. You should account for it in the total.

Further reading and materials

Written and reviewed by the RUŌOD Lab team. This is general education, not legal, regulatory, medical or safety advice. Example dilutions and exercises are for learning, are not validated products, and have not been safety-assessed. Completing a lesson confers no qualification. How we check these lessons.