About the Candle Wax and Fragrance Calculator
This candle calculator works out how much wax and fragrance oil to weigh for a batch of container candles. Enter how many jars you are filling, how much water each jar holds when filled to your pour line, and the fragrance load you want, and it returns the wax and fragrance weights in ounces, pounds and grams, along with the material cost per candle.
It is for home candle makers scaling a recipe up or down and small candle businesses pricing a product line. Container volume is measured with water because jars are labelled inconsistently; wax is lighter than water, so the water weight is multiplied by a wax factor (about 0.86 for soy container wax) to get the weight of wax that fills the same space.
Fragrance load is the fragrance oil as a percentage of the wax weight — the convention most wax and fragrance suppliers use. Never exceed the maximum load listed by your wax manufacturer (often 10–12%), and always follow the fragrance supplier’s safety data for flash point and usage rates.
With the default inputs, the wax to melt is 40.13 oz. Change any value above to recalculate instantly.
How to use the candle wax and fragrance calculator
- 1Fill one container with water to your pour line and weigh the water in ounces.
- 2Enter the number of candles and the wax factor for your wax (0.86 for soy).
- 3Choose a fragrance load within your wax manufacturer’s maximum.
- 4Add a small margin for spills and top-up pours.
- 5Enter material prices to see the batch cost and cost per candle.
Formula and method
Each container is measured by the weight of water it holds up to the pour line. Wax is less dense than water, so that water weight is multiplied by a wax factor (about 0.86 for soy) to give the weight of wax plus fragrance that fills the same volume. Multiplying by the number of candles and adding a small margin for spills gives the total fill weight.
Fragrance load is expressed as a percentage of the wax weight, so the fill is split as wax = fill ÷ (1 + load) and fragrance = wax × load. That way the wax and fragrance together still fit the containers. Costs use your wax price per pound (16 oz) and fragrance price per ounce, plus the per-candle cost of jars, wicks and labels.
- Water oz
- Weight of water one container holds to the pour line
- Wax factor
- Wax weight that fills the same volume as 1 oz of water
- Load%
- Fragrance oil as a percentage of wax weight
Worked examples
Six 8 oz jars of soy wax at 8% fragrance
Each jar holds 8 oz of water, or 8 × 0.86 = 6.88 oz of wax and fragrance; six jars plus 5% extra need 43.34 oz. Splitting at 8% gives 43.34 ÷ 1.08 = 40.13 oz of wax and 3.21 oz of fragrance. Wax costs $7.53, fragrance $4.01 and jars and wicks $12, about $3.92 per candle.
Twenty-four 12 oz tins at 10% fragrance, no extra
Each tin takes 12 × 0.86 = 10.32 oz, so 24 tins need 247.68 oz. Wax is 247.68 ÷ 1.10 = 225.16 oz (14.07 lb, $35.18) and fragrance 22.52 oz ($22.52); with $36 of tins and wicks the batch costs about $93.70.
Frequently asked questions
How much wax do I need for an 8 oz candle?+
An 8 oz (by water) jar holds about 6.9 oz of soy wax and fragrance, because soy wax weighs roughly 86% as much as the same volume of water. At an 8% fragrance load that is about 6.4 oz of wax and 0.5 oz of fragrance.
How do you calculate fragrance load?+
Fragrance load is fragrance weight divided by wax weight. For 16 oz of wax at 8%, add 16 × 0.08 = 1.28 oz of fragrance oil. Most container waxes are rated for 6–12%; check your wax’s maximum.
Why measure candle containers with water?+
Jar sizes are often marketed by volume or the weight of wax they hold, which varies by brand. Weighing the water a jar holds to your pour line gives a precise, repeatable volume you can convert to wax weight with a density factor.
Does more fragrance oil make a stronger candle?+
Not always. Above the wax’s maximum, oil can seep to the surface (sweating), and throw depends more on the fragrance, wax type, wick size, cure time and adding fragrance at the right temperature than on load alone.
How many candles does a 10 lb bag of wax make?+
Ten pounds is 160 oz. At 6.88 oz of fill per 8 oz jar and 8% fragrance, each candle uses about 6.37 oz of wax, so 10 lb makes roughly 25 candles before allowing for spills.