Fragrance load is the single most important number in candle making. Get it wrong and your candles either barely smell or sweat oil all over the counter. Here is the exact math, what safe ranges look like for different waxes, and the most common mistakes people make.

What Is Fragrance Load?

Fragrance load is the percentage of fragrance oil in the total weight of your candle. Total weight means wax plus fragrance oil combined, not just the wax by itself.

This is where most beginners get tripped up.

If you have 10 oz of wax and you want a 10% fragrance load, you do not just add 1 oz of fragrance. The formula is:

fragrance oil = wax weight x (load % / (100 - load %))

So for 10 oz of wax at 10% load: 10 x (10 / 90) = 1.11 oz of fragrance oil. The total candle weight is 11.11 oz, and 1.11 / 11.11 = exactly 10%.

The difference between 1 oz and 1.11 oz seems small for one candle. But across a batch of 50 candles, you are off by over 5 oz of fragrance oil. That is money and scent throw left on the table.

Don't want to do the math by hand? Use the free Fragrance Oil Calculator to get exact amounts instantly.

Safe Fragrance Load Ranges by Wax Type

Every wax has a maximum fragrance load it can absorb. Go over it and you get sweating, poor adhesion, tunneling, or a wick that drowns in oil. Here are the general ranges:

Wax Type	Typical Range	Notes
Soy (464, 444)	6-10%	Some go up to 12%. Check your brand.
Paraffin	6-12%	Generally handles higher loads.
Coconut wax blends	6-8%	Check supplier spec sheet.
Beeswax	3-6%	Low absorption. Natural scent is already strong.
Soy-coconut blends	6-10%	Popular for balanced throw and appearance.

Always check the technical data sheet from your wax supplier. These are general guidelines and your specific wax may have a narrower sweet spot. Want to check whether your current batch is in the safe zone? Use the free Fragrance Load Calculator.

Common Mistakes

1. Calculating load from wax weight instead of total weight

This is the number one mistake. "10% of 10 oz is 1 oz" is wrong for fragrance load. The percentage is based on total weight (wax + oil), not wax alone. It matters more than you think at scale.

2. Using volume instead of weight

Fragrance oils have different densities. One fluid ounce of vanilla fragrance does not weigh the same as one fluid ounce of citrus. Use a digital scale, not a measuring cup.

3. Not accounting for wax loss

Wax sticks to your melting pot, pouring pitcher, and thermometer. If you calculated for exactly 10 oz of wax but actually poured 9.5 oz into your candle, your fragrance load just went up. Add 5-10% extra wax to your total to compensate. The Wax Calculator can help you plan for this.

4. Maxing out the load for stronger scent

More oil does not always mean more scent. Past a certain point, the wax cannot absorb the oil and it pools on the surface (sweating). The wick can also struggle to pull the heavier wax-oil mixture up, causing tunneling or a weak flame. If your candles are not throwing well, the problem is more likely wick size, cure time, or fragrance quality rather than not enough oil.

Quick Reference

Check your ratio: Fragrance Load Calculator
Get exact oil amounts: Fragrance Oil Calculator
Figure out how much wax you need: Wax Calculator
Scale up for a batch: Batch Calculator

How to Calculate Fragrance Load for Candles