How Much Fragrance Oil for 100g, 250g or 1kg of Wax? Get the Maths Right
You have the wax, the jar and a fragrance you cannot wait to try. Then the recipe says “use 8% fragrance,” and a surprisingly basic question appears: eight per cent of what?
This is where many candle-making calculations go sideways. Some instructions use the weight of the wax. Others describe fragrance as a percentage of the finished mixture. Both can be calculated, but they produce different answers.
Here is a practical fragrance oil calculation guide for 100 g, 250 g and 1 kg of candle wax, with the basis of every number made clear.
The quick answer: calculate in grams
When fragrance load is stated as a percentage of wax weight, use:
Fragrance oil weight = wax weight × fragrance percentage ÷ 100.
For example, 250 g of wax at an 8% wax-weight fragrance load needs 20 g of fragrance oil. The resulting wax-and-fragrance mixture weighs 270 g before any other ingredients or handling losses.
These are calculations, not a universal recipe. Before selecting a percentage, check the instructions for your exact wax, the fragrance’s applicable safety documentation and the intended application. Use a level permitted by all of them, then test the complete candle. A maximum is a ceiling, not a target.
Fragrance oil quantity table
Every percentage in this table is based on wax weight. The 6%, 8% and 10% columns are mathematical examples only; 10% may exceed the permitted or useful level for your materials.
| Wax weight | Oil at 6% | Oil at 8% | Oil at 10% |
|---|---|---|---|
| 100 g | 6 g | 8 g | 10 g |
| 250 g | 15 g | 20 g | 25 g |
| 500 g | 30 g | 40 g | 50 g |
| 1,000 g / 1 kg | 60 g | 80 g | 100 g |
If your approved recipe calls for a different percentage, use the formula rather than rounding to the nearest table column. At 7%, for instance, 250 g of wax needs 17.5 g of oil.
“I want a 200 g candle” is a different calculation
If 200 g means your target combined wax-and-fragrance weight, starting with 200 g of wax will overshoot it. At 8% of wax weight, work backwards:
- Wax = 200 ÷ 1.08 = approximately 185.19 g.
- Fragrance = 200 − 185.19 = approximately 14.81 g.
- Total mixture = 200 g.
This is a simplified two-ingredient example. Colourants or other approved additives must be included in a complete formulation. A jar advertised as “200 ml” also does not automatically take 200 g of candle mixture. Establish the appropriate fill for the actual vessel and leave the required headspace.
What changes if the percentage refers to total mixture?
At 8% of a 200 g total mixture, the fragrance is 16 g and the wax is 184 g. That is different from 14.81 g of oil at an 8% wax-weight load.
Neither equation is confusing once the denominator is written down. Put “% of wax weight” or “% of total formulation” at the top of your recipe. If a supplier’s suggested range does not identify the basis, ask rather than assuming. The same care applies when comparing an IFRA limit with a recipe expressed on a different basis.
Why millilitres and drops are a poor shortcut
A 15 ml bottle is a volume measurement. It does not tell you that the contents weigh 15 g. Fragrance oils can have different densities, so the weight of the same volume can vary. CandleScience also explains this distinction in its guidance on fragrance bottle fill levels and density.
Use a suitable digital scale, tare the empty measuring container and weigh the oil. Choose a scale with enough resolution for the small amount you are measuring and check its operation according to the manufacturer’s instructions. A kitchen scale that only registers whole grams can be limiting for tiny trial batches.
Counting drops is even less repeatable: the dropper, liquid and pouring technique all affect the amount. If you are trying to repeat a successful candle, your notebook needs grams.
More fragrance is not a repair strategy
A weak-smelling candle can tempt you to add another splash. Resist changing the batch by instinct. Fragrance performance belongs to a whole system: the wax, oil, wick, vessel, processing method, cure conditions and burn behaviour.
For example, Horizon Bleu has a published suggested candle range of 2–8%, with testing and technical guidance required. That does not make every number in the table suitable for it, or establish the ideal level in your wax. Confirm the percentage basis and current documentation before formulating.
Blue Daybreak and Latifa Bakhoor have different scent profiles. Do not assume they will need the same wick or perform identically at the same percentage. Keep a separate test record for each combination.
A batch note you will actually use again
Record the wax name and batch, fragrance name and batch, wax grams, oil grams, percentage basis, vessel, wick, relevant temperatures and dates. Add the cure period specified for your materials and the results of complete burn testing.
Write down what you changed between trials. “A little stronger” is not a reproducible recipe; “same wax and vessel, different documented fragrance load” is something you can evaluate.
For a first purchase, our fragrance sample testing notebook guide helps you decide what to learn before ordering larger quantities. If the candle itself is misbehaving, work through our beginner candle troubleshooting guide before increasing fragrance.
Keep this beside your scale
Weigh the wax. Confirm the permitted percentage and its basis. Calculate and weigh the fragrance. Label the trial. Test the finished candle. Once those habits are in place, scaling the arithmetic becomes straightforward—and your next batch is much easier to understand.
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