Candle wax blend calculator
700.0 g of the first wax and 300.0 g of the second make a blend with a specific gravity of 0.900 g/mL. The batch fills 37.6 US fl oz; the number of jars of your size is in the results below.
Result
First wax
g
Second wax
g
| First wax | 700.000 g |
|---|---|
| Second wax | 300.000 g |
| Third wax | 0.000 g |
| Percentages entered | 100.000 % |
| Blend gravity (one over the sum of share over gravity) | 0.900 g/mL |
| Batch volume (weight over gravity) | 37.571 US fl oz |
| Jars filled (volume over jar fill) | 4.696 pcs |
How it works
Each wax weighs the batch weight times its share, with the shares scaled to add up to a whole. The blend's specific gravity follows from adding the volumes the waxes take, which is one divided by the sum of each share over its gravity. Dividing the batch weight by that gravity gives the volume, and dividing the volume by your jar size gives the number of jars. For a soy and coconut blend, choose custom for the coconut wax and enter the gravity from its data sheet, then set the shares as the ratio you want.
Formula
f_x = pct_x / (pct_a + pct_b + pct_c) for x in a, b, c. Weight of wax x = batch_mass x f_x. Gravity of wax x: soy 900, paraffin 900, beeswax 970 kg/m3 (constants.wax_gravity_kg_m3) or gravity_x for wax_x = custom; only waxes with f_x > 0 count. Blend gravity (volumes of the waxes are assumed to add) = 1 / sum(f_x / gravity_x). batch_volume = batch_mass / blend_gravity. jars = batch_volume / (jar_volume x fill_pct). jars_whole = floor(jars + 1e-9). total_pct = pct_a + pct_b + pct_c.
Worked example
The calculator opens with this example; the result above is computed from it.
| Input | Value |
|---|---|
| Batch weight | 1,000 g |
| First wax | Soy wax |
| First wax share | 70 % |
| Second wax | Paraffin wax |
| Second wax share | 30 % |
| Third wax | Beeswax |
| Third wax share | 0 % |
| Jar volume | 8 US fl oz |
| How full | 100 % |
| First wax | 700.0 g |
| Second wax | 300.0 g |
Common cases
| Case | Starting values | First wax | Second wax |
|---|---|---|---|
| Soy and paraffin, seventy thirty | Batch weight 1,000 g; First wax share 70 %; Second wax share 30 %; Third wax share 0 %; Jar volume 8 US fl oz; How full 100 % | 700.0 g | 300.0 g |
| Soy with a little beeswax | Batch weight 907.18474 g; First wax share 90 %; Second wax share 10 %; Third wax share 0 %; Jar volume 9 US fl oz; How full 95 % | 816.5 g | 90.7 g |
| Three-wax blend | Batch weight 1,500 g; First wax share 70 %; Second wax share 20 %; Third wax share 10 %; Jar volume 4 US fl oz; How full 100 % | 1,050.0 g | 300.0 g |
| Small test batch | Batch weight 250 g; First wax share 80 %; Second wax share 20 %; Third wax share 0 %; Jar volume 4 US fl oz; How full 100 % | 200.0 g | 50.0 g |
Assumptions and limits
- The volumes of the waxes are assumed to add up when melted together, which holds closely for waxes of similar kind.
- The wax figures are typical values from the sources named on this page. Brands differ, so use your supplier's number when you know it.
- Blending changes how a wax burns, sets and holds fragrance. This tool only does the arithmetic; test a small candle.
- Shares are scaled to add up to a whole before the weights are found.
The result is an estimate for planning, not professional advice.
Sources
- Wax blend ratio calculator: individual wax weight = total batch weight x (percentage / 100), normalised to 100 %retrieved 2026-10-12
- Candlemaking (AU) safety data sheet, soy wax flake GW464: specific gravity 0.9retrieved 2026-10-12
Last updated:
Method in depth: Wax weight from volume: specific gravity and the ounce problem
Cite this page: Candle Math, “Candle wax blend calculator”, https://candle-math.pages.dev/candle-wax/wax-blend-calculator/ (updated 12 October 2026).
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