How Fragrance Load Works
In candle making, fragrance is dosed as a percentage of the wax weight — the fragrance load. Choose your wax type, weigh your wax, pick a load percent, and the amount of fragrance oil follows directly. Most candles sit between 6% and 10% load. That percentage, not the size of your jar, is what determines how much oil goes in and how the candle will smell.
A Worked Example: 16 oz of Soy at 8%
Say you are pouring one candle from 16 oz (1 lb) of soy wax and want an 8% fragrance load. The math is 16 × 8 ÷ 100 = 1.28 oz of fragrance oil. Weigh out 1.28 oz on a scale, add it to the 16 oz of wax, and your total batch weighs 17.28 oz. Bump the load to 10% and you would use 1.6 oz instead. This is the same simple ratio the calculator runs, scaled up for however many candles you pour.
Respecting the Wax's Maximum Load
Every wax has a ceiling on how much oil it can bind — often around 10% for soy and coconut, up to 12% for paraffin, and closer to 6% for beeswax. Below that ceiling the oil dissolves into the wax and burns clean. Above it the oil separates out, sweats on the surface, and drowns the wick, and the scent does not actually get stronger. Treat the wax maximum as a hard cap, and remember the fragrance supplier's IFRA usage level may cap it lower still.
Candle Fragrance Calculator
Fragrance Oil by Wax Weight & Percentage
Ounces of fragrance oil needed per candle
| Wax (oz) | 6% | 8% | 10% | 12% |
|---|---|---|---|---|
| 4 oz | 0.24 oz | 0.32 oz | 0.40 oz | 0.48 oz |
| 8 oz | 0.48 oz | 0.64 oz | 0.80 oz | 0.96 oz |
| 12 oz | 0.72 oz | 0.96 oz | 1.20 oz | 1.44 oz |
| 16 oz | 0.96 oz | 1.28 oz | 1.60 oz | 1.92 oz |
| 24 oz | 1.44 oz | 1.92 oz | 2.40 oz | 2.88 oz |
| 32 oz | 1.92 oz | 2.56 oz | 3.20 oz | 3.84 oz |
How to Use This Calculator
- Select Your Wax Type: Pick soy, paraffin, coconut, or beeswax. Each has a different maximum fragrance load, so this sets the safe ceiling for your pour.
- Weigh and Enter Your Wax: Enter the wax weight in ounces, measured on a scale rather than by jar size. Fragrance load is calculated against this weight.
- Set Your Fragrance Load and Candle Count: Choose a load percent (6–10% is typical) and how many candles you are pouring. Keep the percent at or below your wax's maximum.
- Calculate and Weigh Out the Oil: Run the numbers to get fragrance oil per candle, total oil for the batch, and total batch weight. Weigh the oil on a scale to hit the amount exactly.
How It Works
Fragrance load is a percentage of your wax weight, not the finished candle weight. Multiply the wax weight by the load percent and you have the fragrance oil to weigh out. The ceiling on that percent is set by the wax, because each wax can only hold so much oil before it stops binding.
The basic rule:
- Fragrance oil (oz) = wax weight (oz) × fragrance percentage / 100
- Total batch weight = wax weight + fragrance oil weight
- Soy wax typically holds 6–10% fragrance load
- Paraffin wax can hold up to 10–12%
- Beeswax holds less fragrance — typically 3–6%
Pouring more oil than the wax can hold does not make a stronger candle. Past the binding limit the extra fragrance separates out as sweating (beads of oil on the surface), clogs the wick, and can make the flame sputter. When a scent reads weak, the fix is almost never more oil — it is cure time, wick size, or pour temperature. Test each wax and fragrance pairing before you scale.
Tips & Considerations
- Weigh both wax and fragrance oil on a digital scale — fragrance load is a weight ratio, so measuring oil by volume throws off the dose.
- Keep your load at or below the wax's rated maximum; past that point the oil sweats out and the scent does not get any stronger.
- Compare the IFRA usage level on the fragrance's certificate against the wax maximum and use the lower of the two.
- When throw seems weak, cure the candles longer and check your wick size before you ever reach for more oil.
- Add fragrance at the temperature your wax recommends (around 180°F for soy) and stir a full minute or two so the oil binds evenly.
- Log the wax, fragrance, load percent, and cure time for each test pour so you can repeat the ones that throw best.
Frequently Asked Questions
What fragrance load percentage should I use?
Most makers land between 6% and 10% of the wax weight. Start at 6% for a soft, close scent and move toward 8–10% for a room-filling hot throw. On 16 oz of soy at 8% that works out to 1.28 oz of fragrance oil. Stay at or below your wax's rated maximum — for soy and coconut that is usually about 10%, paraffin about 12%, and beeswax closer to 6%.
Can I exceed the wax's maximum fragrance load?
No — going past the rated maximum backfires. Once you pass the amount the wax can bind, the surplus oil separates instead of dissolving. You get sweating on the surface, a wick that clogs and drowns, and in some cases a flame that flares or sputters. The wax simply cannot lock in more oil, so the extra is wasted and works against you.
Should I measure fragrance oil by weight or by volume?
Always by weight, on a digital scale in ounces or grams. Fragrance load is a weight-to-weight ratio against the wax, and oils vary in density, so measuring by volume (mL or teaspoons) drifts off target. Zero the scale with your pouring pitcher on it, add wax, note the weight, then multiply by your load percent to get the oil weight. The calculator shows mL and grams too, but weight is the number to trust.
Why does my candle have weak scent throw?
Weak throw usually is not a fragrance-load problem. The common causes are too little cure time (soy often needs 1–2 weeks), a wick too small to melt a full pool and release scent, or fragrance added when the wax was too hot, which flashes off the oil. Adding more oil past the wax's limit will not help and can cause sweating. Check cure, wick size, and pour temperature first.
At what temperature do I add the fragrance oil?
Add fragrance once the melted wax has cooled to the range your wax recommends, commonly around 180–185°F for soy, and stir gently for a full minute or two so the oil binds evenly. Pouring oil into wax that is above the fragrance's flash point burns off scent and is a fire risk, so keep the flash point in mind.
Do IFRA limits affect how much fragrance I can add?
Yes. Beyond what the wax can physically hold, the fragrance supplier publishes an IFRA maximum usage level for candles based on the oil's ingredients. That safety ceiling can be lower than the wax's binding limit, so use whichever is smaller. Check the IFRA certificate for each oil, especially if you sell your candles.
Can I use essential oils instead of fragrance oil?
You can, but essential oils tend to throw weaker in wax and cost more, and some (citrus especially) have low flash points that hurt performance. Use the same percentage math against the wax weight, and check each oil's flash point and safe-use guidance before pouring.