Candle Wax Calculator – How Much Wax You Need
Making candles at home is one of those crafts that feels like magic — until you melt too much wax, waste fragrance oil, or pour a candle that sets with a dip in the middle.
Candle Wax Calculator
Fragrance load is the share of the wax weight used as fragrance oil. The usual range is 1–12%; 8% is a good starting point.
The secret to a clean, even candle is measuring before you melt.
Different waxes weigh different amounts for the same volume, and the fragrance oil is always a share of the wax weight, never a guess.
This free candle wax calculator works out exactly how much wax and fragrance oil your container needs, in ounces and grams, so every pour comes out right and nothing goes to waste.
How to Use This Calculator
EXAMPLE
Let us make a candle in a jar that is 3 inches across and 4 inches tall, using soy wax and an 8% fragrance load.
First the volume: the radius is half the diameter, so 1.5 inches.
The volume is π × 1.5² × 4, which is about 28.3 cubic inches.
Convert that to fluid ounces: 28.3 × 0.554 = about 15.7 fl oz.
Soy wax weighs 0.86 times the volume, so 15.7 × 0.86 = about 13.5 oz of wax (around 382 grams).
The fragrance oil is 8% of the wax weight: 13.5 × 0.08 = about 1.1 oz (around 30 grams).
So for this jar you would weigh out 13.5 oz of soy wax and 1.1 oz of fragrance oil.
If you switched to beeswax, the same jar would need a little more wax, because beeswax is denser — that is why the wax type matters.
THE BOTTOM LINE
A good candle starts on the scale, not at the stove.
When you weigh your wax and fragrance oil instead of guessing, every candle in a batch smells the same, burns the same, and sets with a smooth top.
The maths is simple — volume, times the wax factor, times the fragrance share — but doing it by hand every time is slow and easy to get wrong.
Keep this calculator open on your phone while you craft, weigh everything carefully, and always test a small batch before making a dozen.
Your candles, and the people who receive them, will notice the difference.
Frequently Asked Questions
Why do I weigh wax instead of measuring it in cups?
Wax is sold and used by weight, and its volume changes as it melts and cools. A cup of solid wax flakes does not weigh the same as a cup of melted wax, so cup measures are unreliable.
What fragrance load should I use?
Most candle makers use between 6% and 10%, and 8% is a safe starting point. A lower load gives a gentle scent. A higher load gives a stronger scent, but above 12% it can sweat or burn poorly.
Why does soy wax need less weight than beeswax for the same jar?
Different waxes have different densities. Beeswax is denser than soy wax, so the same volume of it weighs more. The calculator handles this with a wax factor — 0.86 for soy, 0.90 for paraffin, and 0.96 for beeswax.
What if my container is not a straight cylinder?
Use the “By volume” mode instead. Fill the container with water to the wax level, then pour it into a measuring jug and note the fluid ounces. Enter that number, and the calculator will work from the true volume.
Should I leave room at the top of the container?
Yes. Leave about half an inch of space below the rim. Wax shrinks slightly as it cools, and a little headroom keeps the melted wax from spilling when the candle is lit and carried.
Can I double the recipe for a bigger batch?
Yes — the maths scales exactly. If one jar needs 13.5 oz of wax and 1.1 oz of fragrance oil, two jars need double that. Just weigh the total and melt it in one pot.
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