I'm Making 500 Candles in the Same Glass Jar — How Do I Calculate Wax Requirement After Accounting for Fragrance Oil and Production Loss?

Take the oil out before you multiply

At 500 units every small misunderstanding is multiplied by 500, and this one is the largest. CSI's convention, and a common one among candle makers, is load as a percentage of the total finished candle weight. A 150 g candle at 8% is 12 g of oil and 138 g of wax. If you plan "150 g of wax per jar and 8% oil on top", you have planned a 162 g candle for a jar that holds 150 g, and ordered 75 kg of wax where 69 kg is needed: 6 kg, or 8.7%, too much before a single gram of loss.

Every 1% of load moves 750 g per 500 candles from wax to oil (800 g once loss is counted). At 10% you need 1.6 kg less wax than at 8% and 1.6 kg more oil, and oil costs roughly seven times as much per gram as CSI 464, so the load is the biggest cost lever in the run; what that does per candle is worked in I Changed My Fragrance Load From 6% to 10% — Will That Change How Much Wax I Need to Put Into Each Jar?. Both ceilings here are 10%: CSI 464's page and the Roasted Coffee page ("6-10%"). The lower of the two stated maximums governs, and a ceiling is not a target.

The four production-loss categories

It helps to separate loss by what physically happens, because each behaves differently as the run grows. Two scale with the number of melts, one with the number of jars, and one is mostly not a loss at all.

1. Residue and unused top-up reserve (per melt)

Every melt leaves a film on the melter or pot walls, a puddle below the tap or lip, drips on jar rims and the table, and whatever you held back for top-ups but did not use. Soy commonly shrinks as it cools, and many makers top up sunken surfaces from the same melt, so some reserve is sensible; what is left after the last top-up is scented and has no jar. This loss is roughly fixed per melt, not per kilogram, which is why fewer, larger melts lose a smaller share. We plan 200 g per 8 kg melt (2.5% of each melt).

2. Rejects (per jar poured)

Candles you pour and do not sell: a jar found chipped or cracked after the pour, a spill down the outside, a wick knocked badly off-centre while setting, a jar dropped. The wax in these is usually lost; you do not re-melt wax out of a chipped jar for sale. This scales with jars and with how tired the pourer is. We plan 2% of units: 10 jars at 500. Chipped jars on arrival are a jar-buying question, handled in I'm Making 500 Candles for a Wedding Order — How Many Extra Glass Jars Should I Buy to Cover Transit Damage and Production Rejects?; here we only count candles that were poured.

3. Test candles pulled from the line (per melt)

At 500 units you want evidence that melt 9 behaves like melt 1: the same fill weight, the same load, the same burn. Pull one finished candle from each melt, label it with the melt number, and keep it. Burn one or two, and keep the rest as retained samples for any complaint later. These are real candles with real wax; they are not waste, but they are not for sale either. Ten melts, ten candles.

4. Re-pours and surface fixes (mostly not a loss)

A cracked top, a sinkhole or a rough surface is usually fixed in place: a second pour from the reserve or a pass with a hot air gun (the page says it reaches "about 200°c" and to keep 5–6 cm away). The wax stays in the jar, so it is not an extra allowance line; it is why the top-up reserve exists. The exception is a candle so bad you empty the jar, which you then count as a reject.

A percentage allowance framework, labelled judgement

If you have no records yet, start from a band and adjust for how you work. The table below is our judgement for a single jar, a single wax and a single scent at 500 units. It is not a measured loss rate for any product.

The allowance in this guide costs ₹2,334.04 in wax, ₹1,495.20 in oil, ₹1,416.00 in 20 extra jars and ₹188.80 in 20 extra wicks: ₹5,434.04 in all, or ₹10.87 per saleable candle. The alternative, planning with no loss, looks cheaper on paper and runs out about 6.2% before the end of the run, roughly 33 candles short, in the last melt, when the order is due.

Planning the run in melts

Batch planning at 500 is a division problem with one constraint: every melt should end with a known number of full jars and a small, known leftover. Choose a melt weight your equipment handles comfortably, divide by your candle weight, and keep a fixed amount back for residue and top-ups.

How melt size changes the loss

Residue is roughly fixed per melt, so the number of melts is the lever. The worked example below assumes 200 g per 8 kg melt, 120 g per 4 kg melt and 75 g per small 1.5 kg round; those per-melt figures are our judgement.

Fifty-two small rounds lose 1.9 kg more blend than ten large melts: 1,748 g of wax and 152 g of oil, worth ₹1,455.11 in this example. That is real money, but it is not enough on its own to justify a ₹21,240.00 electric melter for one order. The melter earns its place in time: ten melts instead of fifty-two. The Mini Electric Wax/Soap Melter states a 1 litre capacity (₹2,360.00), which puts it at or below the small-round row. If you are working in small rounds, raise your residue allowance to about 5% rather than pretending you are running 8 kg melts.

The purchase plan for 500

With 73.6 kg of wax and 6.4 kg of oil to cover, here is how the CSI pack sizes fall. Prices are CSI live pricing on 26 September 2026; quantities are our worked example; costs exclude labour, freight, packaging and GST.

The 75 kg wax basket costs ₹507.40 more than 74 kg and adds 1 kg of unscented wax: that is the sealed-bag insurance from the framework above. For oil, the 6.5 kg basket costs ₹330.00 more than the exact 6.4 kg and gives 100 g of slack; we take it, because a short last melt is the one failure you cannot fix with a heat gun.

For comparison, one candle at exact grams costs ₹195.12: jar ₹70.80, wax ₹70.02, oil ₹44.86, wick ₹9.44. The ₹208.76 per saleable candle is higher because 500 candles carry the cost of the 20 extra jars, the residue and the spare wax. That is the true material cost to price from.

What to buy: wax, oil, melter, jar, wick

Five products that the 500-candle plan depends on, chosen on what their pages state, price and stock on 26 September 2026. The oil is a costing example; the melter is optional.

Checks before you trust the multiplication

Multiplying one candle by 500 assumes every jar holds the same candle. Mass-produced glass varies between pieces and between batches, and 520 jars may arrive in several cartons. Three checks keep the multiplication honest.

Frequently asked questions