I'm Producing Several Different Mould Candle Designs — How Do I Calculate the Combined Wax Requirement When Every Mould Has a Different Fill Weight?

The design sheet

A simple weight table, quantity × weight per shape, works when every design behaves the same way. I Need 100 Silicone-Mould Candles but Each Finished Shape Has a Different Weight — How Do I Calculate Wax Requirements Accurately Before Buying Bulk Wax? covers that case. It stops being enough when the designs differ in how they are made. A plain pillar releases cleanly almost every time, while a seven-flower mould has thin petals that tear. A ribbed pillar needs its seam shaved, and a small flower needs almost no trimming. Some designs are scented and some are not. Each of those differences changes that design's wax, so each one needs its own row. Here is the example range. Every fill and rate is illustrative or a labelled assumption. CSI publishes no mould fill weights.

Three columns do most of the work. Cavities changes how many units each pour makes, and so how many moulds and days you need, but not the grams. The seven-flower mould's seven cavities are in its name. It is the only mould here with more than one. Trim is added to every unit poured, because you trim before you know which units pass. Failed releases is a rate per design, because a delicate shape fails more often than a plain one. The flowers' test allowance is a whole cycle of seven, because the first test pour of a multi-cavity mould fills every cavity.

Calculating each design

Each row goes through the same four steps: good units ÷ (1 − failure rate), round up, add tests; × (fill + trim); × 1.03 for pour loss; then split at that design's load. A 3% pour loss applies across the range, since it is jug and melter residue, not design-specific. The 8% load is a labelled test value. CSI publishes no fragrance ceiling for Soy Pillar Wax.

The unscented daisy puts its whole weight into wax. The scented designs put 92% into wax and 8% into oil. That is why the wax column cannot be found by multiplying the finished weight by anything. The flowers show the effect of a design-specific failure rate: 140 good flowers at 5% failure need 148 production flowers, and the first test cycle adds 7. A blanket "5% on everything" would over-plan the pillars and could under-plan the flowers. Here, a single blanket figure of 156.50 g average × 400 × 1.05 × 0.92 gives 60,471.60 g of wax, against 63,944.25 g design by design. The blanket figure is 3,472.65 g short, mostly because it ignores trim and the flowers' higher failure rate, and it cannot show you which design is short.

Combining: what to add together and what to keep apart

Once every row is calculated, sort the materials by what is really interchangeable. Wax is shared. All four designs pour from Soy Pillar Wax, so the four wax figures become one order. Oil is shared only within a scent. The pillar and the flowers are both lavender, so their oil is one Lavender order, and the ribbed pillar's Sandalwood is separate. Wicks are shared only within a size, and wick size per design is not published, so burn-test each design and group the wicks by the size each one passes on.

Rounding once saves ₹600.00 and 1,000 g of wax you would otherwise carry. That is modest, because Soy Pillar Wax is priced flat and sold down to 500 g, so no single rounding wastes much. The practical gains are bigger: one delivery, one line on the invoice and one stock figure to watch. The oil is where combining matters more. Rounding Lavender separately for the two designs buys 3,130 g for ₹16,432.04. Rounding it once buys 3,115 g for ₹16,308.02.

Mould cycles and how many moulds

Grams decide the wax, but cycles decide the moulds. A cycle is one pour, set and release. Each mould gives a number of cycles per day that depends on the wax, the room and the size of the candle, and none of that is published. Time your test pours. The table uses a labelled 2 cycles per mould per day and a 10-day production window.

The seven-flower mould pours 155 flowers in 23 cycles, so one mould easily covers it. The plain pillar needs 123 cycles on a one-cavity mould, which means 7 moulds in a 10-day window. This is where a multi-design range gets expensive. The plain-pillar moulds alone cost ₹6,599.74, 37% of the wax they pour. Stretch the window to twenty days and the pillar moulds halve. Work back from your deadline before buying, and buy one of each design first to time the cycle. I Need 500 Bubble Candles for Wedding Favours — How Much Pillar Wax Should I Purchase After Accounting for Failed Unmoulding and Broken Candles? does the same maths for a single bubble mould.

The priced order

Wicks are not priced in the list because each design needs its own burn-tested size, and none is published. Once you have them, group by size, count one wick per unit poured (including failures and tests), and buy from the Candle Wicks collection. A Braided Wick Roll (61 m, ₹706.82) suits threaded mould candles. The ribbed pillar mould's 5 × 7 cm size is out of stock, which is why the example uses the 5 × 15 cm. The Candle Mold Sealer (₹472.00) is worth having for the single-cavity pillar moulds.

If some of the range is jar candles in a container wax, the wax cannot be combined at all. I Want to Buy Enough Wax for Both Jar Candles and Mould Candles — How Should I Calculate Quantities Separately When the Two Products Use Different Waxes? covers keeping the two waxes apart. For the trimming side of each row in detail, see I Need 1,000 Fragranced Mould Candles — How Do I Calculate Wax and Fragrance When Each Candle Loses a Small Amount During Trimming and Finishing?. To combine several separate customer orders in the same month, I Have Three Bulk Orders Happening in the Same Month — How Do I Combine Their Wax Requirements While Keeping Fragrance Oils and Packaging Quantities Separate? uses the same add-what-is-shared logic.

Three neighbouring pages cover the edges of this method. I Need 1,000 Decorative Mould Candles with No Fragrance — How Much Pillar Wax Should I Buy if Each Finished Candle Weighs 120 g? is the single-design, unscented version at 1,000 pieces. I Have 25 Kg of Pillar Wax — How Many 150 g Mould Candles Can I Realistically Produce After Accounting for Spills and Trimming Waste? works backwards from a fixed 25 kg of wax, and My Corporate Order Uses Three Candle Sizes and Four Fragrances — How Do I Create a Raw-Material Requirement Sheet Without Double-Counting Wax or Fragrance? builds a requirement sheet for container candles in three sizes and four fragrances.

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