How the candle wax calculator works
The reliable way to size a container is by weight. Fill the empty container with water to the height you’ll pour your wax, then weigh that water (or enter the jar’s fluid-ounce capacity). Wax is lighter than water, so the container holds less wax by weight than water. Multiply the water weight by a fill factor to get the weight of wax plus fragrance the container takes [1][2]:
fill weight = water weight × fill factor (about 0.86)
Guides use 0.85–0.86 as the general rule [1][2]. Real waxes vary: NorthWood lists its own waxes between about 0.77 and 0.90 [1]. For your exact figure, weigh a finished, cooled candle and divide by the water weight of its container, then enter that as the fill factor.
Fluid ounces are not ounces of weight
An 8 oz jar is usually 8 fluid ounces of volume. That much water weighs about 8.3 oz, because a US fluid ounce of water is about 29.6 g and an ounce of weight is 28.35 g. Some guides multiply the fluid ounces straight by 0.86 [2], which comes out about 4% low. Pick the right unit and the calculator handles it.
Fragrance: “% of wax” or “% of total”
There are two ways to state a fragrance percentage, and they give different amounts of oil [3][4]:
- Fragrance load (% of wax weight): oil = wax × percentage. 200 g of wax at 10% takes 20 g of oil, 220 g in all.
- Fragrance content (% of total): oil = total × percentage. A 220 g candle at 10% is 22 g of oil and 198 g of wax.
Wax makers state maximum loads as a percentage of wax weight. A 10% load is 9.09% of the total, and 10% of the total is an 11.1% load. Because the container holds a fixed total, the calculator splits the fill weight so wax plus oil fits: wax = fill ÷ (1 + load) [4][5].
Maximum fragrance load
Every wax can hold only so much oil. Past that it can seep out of the candle or burn poorly, and the scent won’t get stronger. The calculator warns you when you go over the max set for your wax. Defaults use the lower of two guides’ upper limits; your supplier’s data sheet overrides them.
| Wax | Default max | What the guides say |
|---|---|---|
| Soy container wax | 10% | NorthWood: 6–10%; Craftybase: up to 10–12% (464) [5][6] |
| Paraffin | 10% | Craftybase: 6–10%; NorthWood: 6–12% [5][6] |
| Coconut wax | 12% | NorthWood: 8–12%; Craftybase: 10–12% [5][6] |
| Soy–coconut blend | 12% | NorthWood: 8–12%; Craftybase: 10–12% [5][6] |
| Beeswax | 6% | NorthWood: 3–6%; Craftybase: 3–6% [5][6] |
Candles from the wax you have
The second tab works backwards: it finds the wax in one candle (after leaving room for fragrance), divides your wax by it and rounds down to whole candles. The leftover wax is shown so you can plan a few extra jars or top-ups.
What this calculator doesn’t do
It doesn’t pick wicks or test fragrance oils, and it isn’t safety advice. Wick size, pour temperature and how much oil a fragrance can safely take depend on your wax, oil and container. Follow your supplier’s data and test-burn before selling.
Common questions
How many candles will 2 lbs of wax make?
About 4 candles in 8 fl oz jars at an 8% fragrance load, or about 8 candles of 4 oz net weight (those numbers come from this calculator with a 0.86 fill factor). Smaller jars make proportionally more.
How many 4 oz candles will 10 lbs of wax make?
About 43 candles if “4 oz” is the net weight and you use an 8% load: each candle holds about 3.7 oz of wax plus 0.3 oz of oil. If you mean 4 fl oz jars, it’s about 48.
How much fragrance oil per pound of wax?
At a 6% load, about 0.96 oz of oil per pound (16 oz) of wax; at 8%, 1.28 oz; at 10%, 1.6 oz. Check your wax’s maximum before going higher.
How much wax do I need for an 8 oz candle?
An 8 fl oz jar holds about 8.3 oz of water, so about 7.2 oz of wax plus fragrance at a 0.86 fill factor. At an 8% load that’s about 6.6 oz of wax and 0.5 oz of oil.
Should I measure wax by volume or weight?
By weight. Wax and fragrance are both sold and measured by weight, and weighing on a kitchen scale is far more consistent.
Sources
- NorthWood Candle & Craft, “How much wax do you need to fill a candle container?”Water-weight method with a 0.85 factor; worked example of 10 oz water → 8.5 oz, less 10% fragrance
- Glassnow, “How to Calculate Wax Weight for Candle Containers”0.86 rule of thumb; worked example 9 fl oz jar → 7.74 oz wax
- Candle Shack, “Fragrance Calculations”Fragrance load (of wax) vs fragrance content (of total), with worked examples
- NI Candle Supplies, “How to Calculate Fragrance Scent Load”Scent load as oil ÷ wax; 300 g at 10% = 272.7 g wax + 27.3 g oil
- NorthWood Candle & Craft, “Fragrance Load Formula”Typical min/max fragrance load by wax type; wax = batch ÷ (1 + load)
- Craftybase, “Candle Fragrance Load Calculator”Typical max fragrance load by wax type