Candle Wax Calculator
Wax weight for a batch of container candles
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Candle Wax Calculator turns the numbers behind wax weight for a batch of container candles into a result, step by step. You supply Number of Jars and Jar Size (oz) to Candle Wax; the answer follows at once. The answer from Candle Wax arrives with its working attached. Candle Wax suits budgeting and planning checks. Candle Wax is privacy-first: Lifestyle inputs stay offline. Candle Wax sits in the Lifestyle section next to related tools and candle wax calculator container ounces batch soy. Candle Wax has no learning curve. The fields are labeled. No sign-up or email — Candle Wax answers as you type.
What the defaults give
12 jars of 8 oz take 82.6 oz of wax.
The container volume is 96 oz, but wax fills it at about 0.86 of the density of water, which is the whole reason the number is lower.
The formula
Container volume = jars × jar size in oz
Wax weight = volume × 0.86
Fragrance = wax weight × load %
The 0.86 is the specific gravity of paraffin and soy wax blends. Flakes are sold by weight, so a jar that holds 8 fluid ounces of water needs only about 6.9 oz of wax to fill the same space.
Worked examples
12 × 8 oz → 96 oz volume → 82.6 oz wax
6 × 4 oz → 24 oz → 20.6 oz wax
24 × 8 oz → 192 oz → 165.1 oz wax
12 × 6 oz → 72 oz → 61.9 oz wax
12 × 8 oz at 6% fragrance → 4.96 oz added
12 × 8 oz at 10% fragrance → 8.26 oz added
Why the batch usually comes up short
The 0.86 factor assumes you fill the jar to the top. In practice you fill to about 85–90% so the wick stays upright and the melt pool has room, which brings the true wax weight for 12 jars to roughly 70–74 oz. Then wax shrinks as it sets: a single pour sinks slightly in the middle, and a second pour to level the top adds another 5%.
Fragrance is calculated on wax weight, not container volume, so 8% of 82.6 oz is 6.6 oz of oil, not 8% of 96. Most waxes take 6% to 10% before the throw stops improving and the wax starts to sweat; soy generally wants the upper half of that range and paraffin the lower.
Temperature decides whether the batch works
Soy wax melts around 85 °C and is usually poured between 70 and 80 °C; paraffin pours hotter, and palm varies by blend. Pour too cool and you get cavities and a rough top; too hot and the wax contracts hard against the glass. Stir fragrance in at the pour temperature, not into the melt pot at full heat, because volatile top notes burn off above about 85 °C.
Add 10% to the wax figure for the melt pot and pitcher losses — a meaningful film stays on the sides. Buy wicks sized to the jar diameter rather than the wax weight, and always test-burn one candle from the batch before pouring the rest.
Frequently Asked Questions
How much wax for twelve 8 oz candles?
82.6 oz by the density calculation, and closer to 70–74 oz once you fill to 85–90% and allow for shrinkage.
Why is wax weight less than jar volume?
Because wax is about 0.86 the density of water. An 8 fl oz jar holds roughly 6.9 oz of wax.
How much fragrance oil do I add?
Six to ten percent of the wax weight. At the defaults that is 4.96 oz at 6% or 8.26 oz at 10%, not a percentage of jar volume.
What temperature should I pour at?
Soy wax melts near 85 °C and pours at 70–80 °C. Pouring too cool causes cavities; too hot causes the wax to pull away from the glass.
Do I need extra wax for the pot?
Yes, about 10%. A film stays on the pot and pitcher, and a second pour to level sunken tops uses more again.
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