Candle Wax CalculatorCandle Wax Calculator
This candle wax calculator uses precise arithmetic, with typical wax densities, to work out how much wax and fragrance oil to weigh out for any batch of container candles. Enter your container size, pick your wax type, and get per-candle and total wax amounts in grams — instantly.
Use the free candle wax calculator above for the core batch math, then the tool pages gathered here — soy, paraffin, gel, and wax melts, plus fragrance ratios, water-to-wax measuring, weight and volume conversion, batch costing, and wick sizing — to plan the rest of the pour. Each one runs entirely in your browser.
Candle wax calculator
Enter your container volume and batch details to get the wax and fragrance oil weights for your pour. Everything runs in your browser — nothing is uploaded.
How it's calculated
The calculator converts your volume to milliliters first (1 fl oz = 29.5735 ml), then multiplies by your wax's density to get the wax weight per candle. Multiplying by the candle count gives the batch total, the safety margin is added on top, and the fragrance oil is worked out as a percentage of the wax weight before the margin — the standard way fragrance loads are quoted.
Limits: the arithmetic is exact; the wax densities are typical values for candle pours, so confirm with a test batch before a large pour. Fragrance-load choices follow your wax type — see the fragrance load table for the safe range per wax.
All calculators
- Soy Wax CalculatorFree soy wax calculator: enter container diameter, height, and candle count to get wax and fragrance oil amounts in grams, with a worked example.
- Wax Melt CalculatorFree wax melt calculator: enter your clamshell cavities and segment size to get wax and fragrance oil amounts in grams, with a worked example.
- Fragrance Oil to Wax Ratio CalculatorFree fragrance oil to wax ratio calculator: enter your wax weight and load % to get the fragrance oil in grams, with the formula explained.
- Water to Wax CalculatorFree water to wax calculator: weigh the water your container holds and convert it to wax weight for soy, paraffin, beeswax, coconut, or gel wax.
- Wax Weight CalculatorFree wax weight calculator: convert ml or fl oz to grams and ounces for soy, paraffin, coconut, beeswax, and gel wax, with density table and examples.
- Wax Volume CalculatorConvert candle wax weight to volume with this free wax volume calculator.
- Candle Wax Cost CalculatorCalculate candle batch costs with this free wax cost calculator.
- Candle Wick Size CalculatorFind the right wick size for your candle with this free wick size calculator.
- Paraffin Wax CalculatorFree paraffin wax calculator: batch wax weight, 15% second-pour reserve for shrinkage, and fragrance oil at 3–10% load.
- Gel Wax CalculatorFree gel wax calculator: batch gel wax weight and safe 0–5% fragrance loads.
How to use the candle wax calculator
Three steps, about thirty seconds.
1. Measure your container. Find the volume up to the line where you want the wax to stop — not the container's full brim capacity. If your jar holds 240 ml to the fill line, enter 240. Working in fluid ounces? Switch the unit selector and type 8 instead; the calculator converts to milliliters first (1 fl oz = 29.5735 ml).
2. Pick your wax. Soy, paraffin, beeswax, coconut, and gel each have a different density, so the same jar needs a different weight of each. Choose the wax you will pour — the calculator applies that wax's density to convert your volume into grams.
3. Set the batch. Tell it how many candles you are pouring, your fragrance load, and a safety margin — 10% covers spills, shrinkage top-ups, and the wax clinging to your pouring jug. The fragrance-load choices follow your wax type (see the fragrance load table for the safe range per wax). The results show the wax weight per candle, the total wax to weigh out, and the fragrance oil weight for the batch.
Formulas and wax density factors
The calculator does one conversion and two multiplications. Here is exactly what happens to your numbers.
Volume to weight: wax per candle (g) = container volume (ml) × wax density (g/ml). Wax is less dense than water, so the gram figure is always smaller than the milliliter figure — a 240 ml jar never needs 240 g of wax.
Fluid ounces: if you measure in fl oz, the volume is converted to milliliters first (1 fl oz = 29.5735 ml) before anything else happens.
Batch total and margin: total wax = wax per candle × number of candles, then the safety margin is added on top: a 10% margin multiplies the total by 1.10. It covers spills, the film of wax left in the melting pot, and the small second pour most container candles need as the wax shrinks while cooling.
Fragrance oil: fragrance weight = fragrance load % × wax total before the margin. The percentage is calculated on the wax weight, which is the standard way fragrance loads are quoted — an 8% load means 8 g of oil per 100 g of wax. Keeping the margin out of the fragrance math avoids over-scenting the batch.
Use cases
First batches. If you have never poured a particular container, the calculator turns a guess into a shopping list. Weigh exactly what it says (plus the margin) and you will neither run short mid-pour nor melt a slab you do not need.
Gifts and markets. Pouring a dozen identical jars for gifts or a stall? Set the candle count to 12 and buy wax once, in the right amount. The wax cost page can then turn that wax weight into a per-candle materials cost.
Wax melts and tarts. The same math works for clamshells and molds — enter the cavity volume instead of a jar volume. There is a dedicated wax melts page if you pour those regularly.
Workshops and classes. Teaching a group? Run the numbers once for the class container and multiply by the number of students, instead of guessing per person and running out halfway through the session.
Refills and repours. Reusing jars? Measure the fill line with water (see the water-to-wax page), enter that volume, and get the wax for a fresh pour without weighing the old candle.
Limitations
Densities are typical values. The density table below uses typical values for candle pours, but real wax varies by blend, supplier, and additives. If your supplier publishes a density for your exact wax, use it — and always confirm with a test batch before committing to a large pour.
Always pour a test candle first. The calculator gets the amounts right; it cannot tell you how a particular wax, wick, and fragrance behave together. Burn performance, scent throw, and adhesion are discovered by testing, not by arithmetic.
The margin is a cushion, not a guarantee. Ten percent covers normal spillage and shrinkage top-ups. Deep or narrow containers, first-time pourers, and very large batches may want a bigger margin; experienced pourers reusing the same jars may need less.
What this page does not do. Wick sizing depends on wax type and container diameter and has its own page. Curing times, safe fragrance loads for specific oils, and candle safety testing are outside what any calculator can decide for you — follow your wax and fragrance suppliers' guidance.
Wax density table
| Wax type | Density (g/ml) | Weight of 240 ml |
|---|---|---|
| Soy wax | 0.86 | 206.4 g (7.28 oz) |
| Paraffin wax | 0.90 | 216 g (7.62 oz) |
| Beeswax | 0.96 | 230.4 g (8.13 oz) |
| Coconut wax | 0.92 | 220.8 g (7.79 oz) |
| Gel wax | 0.85 | 204 g (7.2 oz) |
Typical densities used to convert the volume of the finished candle (to the fill line) into wax weight. Molten wax is less dense than solid wax, and wax shrinks as it cools — these figures are typical values for candle pours, not measurements of any one supplier's wax.
Worked examples
Example 1 — soy candles. A 240 ml jar, four candles, 8% fragrance, 10% margin. Wax per candle: 240 × 0.86 = 206.4 g. Four candles: 206.4 × 4 = 825.6 g. Add the 10% margin: 825.6 × 1.10 = 908.2 g to weigh out. Fragrance oil: 8% of 825.6 (the wax before the margin) = 66 g.
Example 2 — paraffin in fluid ounces. An 8 fl oz jar, six candles, 6% fragrance, 10% margin. Convert: 8 × 29.5735 = 236.6 ml. Wax per candle: 236.6 × 0.90 = 212.9 g. Six candles: 212.9 × 6 = 1277.6 g. With the margin: 1277.6 × 1.10 = 1405.3 g. Fragrance oil: 6% of 1277.6 = 76.7 g.
Example 3 — beeswax tins. A 4 fl oz tin, two candles, 10% fragrance, 10% margin. Convert: 4 × 29.5735 = 118.3 ml. Wax per candle: 118.3 × 0.96 = 113.6 g. Two candles: 113.6 × 2 = 227.1 g. With the margin: 227.1 × 1.10 = 249.8 g. Fragrance oil: 10% of 227.1 = 22.7 g.
Try the first example in the calculator above — you should get exactly these numbers.
About this calculator
This is a free candle wax calculator maintained by Ian Welkins. Volume-to-weight math uses typical wax densities; fragrance and margin figures are planning estimates you can adjust. Everything runs in your browser — more about this site, or report an error.
Frequently asked questions
How much wax do I need for one candle?
Multiply the container's fill-line volume in milliliters by your wax's density, then by your candle count, and add your margin. The density table and worked examples above show exactly how this works for a 240 ml jar — or just enter your numbers in the calculator above.
What is fragrance load, and how much should I use?
Fragrance load is the weight of fragrance oil expressed as a percentage of the wax weight. An 8% load means 8 g of oil per 100 g of wax. Soy and paraffin container candles commonly use 6–10%, with 8% the common middle ground; other waxes differ — see the fragrance load table for the safe range per wax. Stay within your wax supplier's recommended maximum — too much oil can cause sweating, poor burning, or separation.
How do I convert fluid ounces to milliliters?
Multiply by 29.5735. The calculator has a unit switch that does this conversion for you, so you can type the number printed on your container.
Why does my wax weigh less than the container's volume in ml?
Because candle wax is less dense than water. A milliliter of water weighs 1 g, but a milliliter of wax weighs less than 1 g (see the typical densities in the table above) — so a jar's milliliter figure always overstates the wax weight. That density conversion is the whole point of the calculator: volume alone overestimates how much wax to buy.
Should I add extra wax beyond the calculated amount?
Yes — a 10% safety margin is the default here, and it exists for real reasons: wax clings to the melting pot and pouring jug, a little spills, and most container candles need a small relief pour as the wax shrinks while cooling. Without a margin, the last candle in the batch comes up short.
Can I use this calculator for wax melts?
Yes. Enter the total cavity volume of your clamshell or mold instead of a jar volume, and set the candle count to the number of melts you are pouring. If you pour melts often, the dedicated wax melts page walks through the same math with melt-specific notes.
Is my data uploaded anywhere?
No. Every calculation runs locally in your browser. Your container sizes, wax choices, and results never leave your device — nothing is uploaded and nothing is stored.
How accurate is the calculator?
The arithmetic is exact: volume conversion, density multiplication, batch scaling, and the margin are straightforward math. The judgment call is the density figure, which is a typical value for each wax type — blends vary, so treat the result as a precise starting point and confirm with a test pour before a big batch.
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