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How to calculate the fill weight for any candle vessel

by CandlePal
calculate fill weight

Whether you’re a beginner who is just starting out or you’re an experienced candlemaker, it’s useful to understand how to determine the fill weight of any candle. In this blog post, we’ll discuss what fill weight is and how to find it for any candle vessel. We’ll also provide some tips on how to adjust your fill weight depending on the type of wax you’re using. So, whether you’re a newbie or a pro, read on to learn more!

What is fill weight or total weight?

The actual total weight or fill weight is the combined weight of the wax and the fragrance in the candle, not just the weight of the wax. Because we want this to be a relatively simple overview, we’re not factoring in the weight of the fragrance oil as it related to the fill weight. The density of each fragrance oil varies by its composition, so the amount of oil needed to achieve a certain fragrance oil level will vary depending on the density of the oil. Oils that are denser will require less oil to reach the same level as less dense oil.

Before getting down to business, we thought we should mention that it is important to take into account the type of wax being used, as well as the density of the wax. For example, a container filled with beeswax will have a different fill weight than a container filled with paraffin wax. Wax is less dense than water so it takes more wax to equal the same amount of weight in water. Most common candle waxes are only around 82% – 95% as dense as water, so for every 100 grams of water, you’ll need around 82 – 95 grams of wax. The average density of candle waxes is about 86%, which has a specific gravity of 0.86. The specific gravity is the ratio of the density of the wax to the density of water. This is a measure of how much the wax weighs compared to how much water weighs. So now that that’s out the way, let’s discuss the two ways to determine how much wax is needed for your candle container.

How can I determine the fill weight?

To determine how much wax is needed for a container candle, you have to decide on which container you want to use. Some candle supply companies provide the recommended wax quantity for their containers. If this information is not available, don’t worry, we’ll go over two ways to calculate a reasonable estimate of how much wax is needed to fill a container candle to the desired level. You will need to use a digital scale for the methods to follow.

The first way to calculate the fill weight of a candle vessel is by weighing the empty container. Be sure to keep a record of the result. Then fill the container with melted wax to the desired fill level. Take the weight again. Subtract the starting weight from the end weight to get the fill weight. Now we have the fill weight of the candle vessel.

The second way to calculate the fill weight of a candle vessel is by using water weight. To do this, you will need to weigh your empty container and then fill it with water to the desired level. Once full, take its weight again. Subtract the starting weight from the end weight to get the fill weight of water. Then, using a wax density of 0.86, simply multiply this figure by 0.86 to get the fill weight of wax.

(Fill weight of water in oz/g) x 0.86 = Fill Weight in oz/g

As we’ve mentioned before, the density of wax varies by type so the fill weight for one wax differs from another. Whichever method you choose, keep in mind that this is only an estimation.

So, now that you know a little more about fill weight and how to find it for your candle vessel, what kind of wax are you going to use? Paraffin or beeswax? Soy wax or gel wax? Knowing the density of your chosen wax is important so that you can adjust the fill weight accordingly. If this is all new information to you and you’re feeling overwhelmed, never fear! We have a wealth of information on our blog about making candles, from beginner tips to advanced techniques. Be sure to check them out and get started today!

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