So you are going to need to know how to calculate the amount of wax you need for your containers.
First – working out the volume of your containers using the diagram below
The Method explained
Method A: look at the product description
If the container has a label with a product description on it, that should give you an indication of the volume of the contents in ml. Most containers will give you this information, if they do, skip ahead to Part 2.
Method B: calculate the volume using water
This is an easy and effective method to accurately calculate the volume your container will hold. This method is great for containers that have an irregular shape.
- Fill the container with water, make sure you fill it to the top not just to where you want the fill level to be.
- Pour the water from the container into a measuring jug. Round up the amount to the nearest 10ml. This should give you an accurate volume for your container you want to use.
Next – calculate the amount of soy wax you require for your candles
How to work out the amount of wax required for a single candle
Now you know the volume of your container, calculating the amount of soy wax required is easy. Simply multiply the volume of the container by 0.77. The factor of 0.77 takes into account the lower density of wax (90%) and having a enough wax to fill your container to 85%. You can experiment to come up with your own ratio that allows you to pour just the right amount of wax to leave space for the wick.
Remember this gives the amount of wax in grams that is required for your candle.
If you have a 250ml container you would calculate it as follows:
250 x 0.77 = 192.5 grams
250 [ml of the container] x 0.77 [converts ml to grams] = 192.5 [grams of soy wax required]
How to work out the total amount of wax needed for your entire batch of candles
If you want to make a batch of candles, just multiply the amount of soy wax required for a single container by the total number of containers in your batch.
As an example, if I am making 6 candles using 250ml mason jars, then I would calculate as follows:
250 ml [volume of the container] x 0.77 x 6 [total no. of containers] = 1155 grams [or 1.155 kg]
As a quick reference, we have created a cheat sheet for calculating soy wax.