Core formulas
The formulas to keep straight
Fill volume = vessel volume x fill percentageTotal pour weight = fill volume x wax density factorWax weight = total pour weight / (1 + fragrance load)Fragrance oil = wax weight x fragrance loadFragrance per pound of wax = 16 oz x fragrance loadMaterial cost = wax cost + fragrance cost + vessel + wick + label + packagingHow do you calculate candle wax and fragrance oil?
Start with the filled volume of the vessel, then estimate the total pour weight. Divide total pour weight by one plus the fragrance load to get wax weight. Multiply wax weight by fragrance load to get fragrance oil.
Example: an 8 fl oz jar filled to 90% has 7.2 fl oz of fill volume. At a 0.86 density factor, total pour weight is 6.19 oz. At 6% fragrance load, wax is 5.84 oz and fragrance oil is 0.35 oz.
One pound of wax at 6% fragrance load uses 0.96 oz fragrance oil.
Candle wax and fragrance example
8 fl oz vessel, 90% fill, 0.86 density factor, 6% fragrance load.
| Step | Formula | Result |
|---|---|---|
| Fill volume | 8 fl oz x 90% | 7.20 fl oz |
| Total pour weight | 7.20 x 0.86 | 6.19 oz |
| Wax weight | 6.19 / 1.06 | 5.84 oz |
| Fragrance oil | 5.84 x 6% | 0.35 oz |
| Total check | 5.84 + 0.35 | 6.19 oz |
How much fragrance oil per pound of wax?
Multiply 16 oz by the fragrance load. At 6%, one pound of wax uses 0.96 oz fragrance oil. At 8%, it uses 1.28 oz. At 10%, it uses 1.60 oz.
Do not pick the largest number just because it sounds stronger. The wax maker's maximum fragrance load, wick behavior, hot throw, cold throw, and burn test should decide the final load.
At 10% fragrance load, one pound of wax uses 1.60 oz fragrance oil.
Fragrance oil per 1 lb of wax
| Fragrance load | Fragrance oil per 16 oz wax | Best use |
|---|---|---|
| 4% | 0.64 oz | Light fragrance or strong oils |
| 6% | 0.96 oz | Common planning example |
| 8% | 1.28 oz | Needs wax compatibility check |
| 10% | 1.60 oz | Only if the wax supports it |
| 12% | 1.92 oz | High load, test carefully |
Why does an 8 oz jar not take 8 oz of wax?
An 8 oz jar usually means 8 fluid ounces of volume, not 8 ounces by ingredient weight. Wax is less dense than water, so a jar's fluid-ounce capacity converts to a smaller ingredient weight.
That is why candle makers weigh ingredients. A recipe based only on jar label size can overstate wax, overstate fragrance, and distort cost per candle.
An 8 fl oz jar filled to 90% at a 0.86 density factor has about 6.19 oz total pour weight.
- Use fluid ounces for vessel capacity.
- Use ounces by weight for wax and fragrance oil.
- Use a scale for batch records.
- Run a test pour for the vessel and wax you actually use.
How do you turn a candle recipe into cost?
After the recipe is weighed, price the materials. Wax cost equals wax ounces divided by 16, multiplied by wax cost per pound. Fragrance cost equals fragrance ounces multiplied by fragrance cost per ounce. Then add vessel, wick, label, warning sticker, and packaging.
This material cost is not the selling price. It still excludes labor, failed batches, testing, insurance, marketplace fees, wholesale margin, and profit. Use the candle pricing calculator after the recipe is stable.
A recipe with $6.31 material cost can still need a $20 to $30 retail price after labor, fees, and margin.
Material cost example
| Cost line | Amount | How it was calculated |
|---|---|---|
| Wax | $1.64 | 5.84 oz / 16 x $4.50 per lb |
| Fragrance | $0.61 | 0.35 oz x $1.75 per oz |
| Vessel | $2.40 | Entered cost |
| Wick, label, packaging | $1.65 | Entered cost |
| Material cost | $6.31 | Before labor, fees, and profit |
Decision table
Candle recipe decisions
| Question | Use this input | Best move |
|---|---|---|
| How full should the jar be? | Fill level | Leave safe headspace below the rim |
| How much fragrance? | Fragrance load | Stay within wax maker limits |
| Why is the weight low? | Density factor | Fluid ounces are not weight ounces |
| What does it cost? | Wax, fragrance, vessel, packaging | Calculate material cost before pricing |
| Can I sell it now? | Burn test result | Test before selling, especially after recipe changes |
Worked examples
Examples you can compare against your own numbers
Example 1: 8 fl oz candle jar
The maker fills an 8 fl oz jar to 90% and uses 6% fragrance load.
| Fill volume | 7.20 fl oz | 8 x 90% |
|---|---|---|
| Total pour weight | 6.19 oz | 7.20 x 0.86 |
| Wax weight | 5.84 oz | 6.19 / 1.06 |
| Fragrance oil | 0.35 oz | 5.84 x 6% |
Takeaway: The jar says 8 oz, but the ingredient weight is about 6.19 oz before the candle is priced.
Open the 8 oz candle recipeExample 2: fragrance per pound
A maker wants to batch from exactly 1 lb of wax.
| Wax | 16.00 oz | One pound |
|---|---|---|
| 6% fragrance | 0.96 oz | 16 x 6% |
| 8% fragrance | 1.28 oz | 16 x 8% |
| 10% fragrance | 1.60 oz | 16 x 10% |
Takeaway: The wax maker's limit and burn test should choose the load, not the desire for a stronger scent.
Action checklist
Before you use this number in the real business
- 1Measure vessel capacity.
- 2Choose fill level.
- 3Use a density factor or test-pour weight.
- 4Choose fragrance load within the wax maker's range.
- 5Weigh wax and fragrance oil.
- 6Calculate material cost.
- 7Burn test before selling.
- 8Move to candle pricing after the recipe is stable.
Common mistakes
Mistakes that make the answer look better than reality
FAQs
Questions people ask before making the decision
How much fragrance oil do I add to 1 lb of wax?
At 6% fragrance load, add 0.96 oz fragrance oil to 1 lb of wax. At 8%, add 1.28 oz. At 10%, add 1.60 oz.
Is fragrance load based on wax weight?
Yes, most candle recipes state fragrance load as a percentage of wax weight. Check the wax supplier's instructions before choosing the final percentage.
How much wax goes in an 8 oz jar?
An 8 fl oz jar filled to 90% with a 0.86 density factor uses about 6.19 oz total pour weight. At 6% fragrance load, that is about 5.84 oz wax and 0.35 oz fragrance oil.
Can I use this for soy wax?
Yes. Use the density factor and fragrance limit that match your soy wax. Replace the default with your own test-pour number when accuracy matters.
Can I use this for wax melts?
Yes. Use mold capacity instead of jar capacity, then choose the fragrance load allowed by the wax. Test the finished melt before selling.
Does this calculate candle selling price?
It calculates recipe weight and material cost. Use the candle pricing calculator afterward to add labor, selling fees, and profit margin.
Sources and notes
Where the assumptions come from
Official NIST measurement reference for unit discipline and measurement concepts.
FeeProofed calculator for finished candle price after ingredient cost, labor, fees, and margin.
FeeProofed guide for turning candle cost into a retail or wholesale price.