Candle Fragrance Oil Calculator
Calculate fragrance oil amount from wax weight and desired scent load percentage. Enter values for instant results with step-by-step formulas.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Fragrance Oil (oz) = Wax Weight (oz) x (Scent Load % / 100)
Where Wax Weight is the amount of wax in ounces, and Scent Load is the desired fragrance percentage. For example, 16 oz wax at 8% load requires 16 x 0.08 = 1.28 oz of fragrance oil.
Worked Examples
Example 1: Standard 16 oz Soy Candle
Problem:Calculate fragrance oil needed for a 16 oz soy wax candle at 8% fragrance load. FO costs $2.50/oz, wax $8/lb.
Solution:Fragrance oil = 16 oz x 0.08 = 1.28 oz\nTotal candle weight = 16 + 1.28 = 17.28 oz\nFO cost = 1.28 x $2.50 = $3.20\nWax cost = (16/16) x $8.00 = $8.00\nTotal material cost = $3.20 + $8.00 = $11.20
Result:1.28 oz fragrance oil needed | Material cost: $11.20 per candle
Example 2: Batch of 12 Candles at 10% Load
Problem:Calculate fragrance oil for 12 candles, each with 10 oz wax at 10% fragrance load. FO is $3.00/oz, wax $9/lb.
Solution:FO per candle = 10 x 0.10 = 1.0 oz\nTotal FO needed = 1.0 x 12 = 12.0 oz\nTotal wax = 10 x 12 = 120 oz (7.5 lbs)\nFO cost per candle = 1.0 x $3.00 = $3.00\nWax cost per candle = (10/16) x $9.00 = $5.63\nTotal batch cost = ($3.00 + $5.63) x 12 = $103.50
Result:12.0 oz total fragrance oil | Batch material cost: $103.50
Frequently Asked Questions
What is fragrance load percentage in candle making?
Fragrance load percentage refers to the ratio of fragrance oil to wax weight in a candle, expressed as a percentage. For example, an 8 percent fragrance load means you add 0.8 oz of fragrance oil for every 10 oz of wax. Most candle waxes have a recommended maximum fragrance load that should not be exceeded. Soy wax typically handles 6 to 10 percent fragrance load, while paraffin wax can accommodate 8 to 12 percent. Exceeding the maximum load causes problems like fragrance oil seeping or sweating from the candle surface, poor burn quality, excessive smoking, and potential safety hazards. Starting at the manufacturer recommended load and testing thoroughly before adjusting is the best approach for consistent quality candles.
How do I choose the right fragrance oil percentage?
Choosing the right fragrance oil percentage depends on several factors including wax type, fragrance oil composition, and desired scent throw strength. Soy wax generally works best at 6 to 10 percent, with 8 percent being the most popular starting point. Paraffin wax can handle 8 to 12 percent due to its stronger oil-binding capacity. Coconut and coconut-soy blends usually perform well at 6 to 8 percent. Beeswax has a very low fragrance load capacity of only 3 to 5 percent. The strength of the fragrance oil itself matters significantly since some oils have stronger scent profiles that perform well at lower percentages while others require higher loads. Always test burn your candles at multiple fragrance loads to find the optimal balance between scent throw, burn quality, and cost efficiency.
Why does my candle sweat or have oily spots?
Fragrance oil sweating or seeping typically occurs when the fragrance load exceeds the wax binding capacity, meaning you have added more oil than the wax can properly absorb and retain. This manifests as oily beads or wet spots on the candle surface. Other causes include temperature fluctuations during cooling that cause the wax to contract and release some oil, or pouring at incorrect temperatures. To fix sweating issues, first reduce your fragrance load by 1 to 2 percentage points and retest. Ensure you are adding fragrance oil at the correct temperature recommended by the wax manufacturer, typically 185 degrees Fahrenheit for soy wax. Stir thoroughly for at least two full minutes to ensure complete fragrance binding, and allow candles to cure for the full recommended period before testing.
How often should I change my oil?
Modern vehicles with synthetic oil typically need changes every 7,500-10,000 miles or once a year. Older vehicles or those using conventional oil may need changes every 3,000-5,000 miles. Check your owner's manual for the manufacturer's recommendation and follow the oil life monitor if equipped.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy