A candle wax calculator tells you exactly how much wax to melt for your container, accounting for wax density, fragrance load percentage, and the number of candles in your batch. Instead of guessing and wasting materials, enter your jar dimensions and let the calculator give you precise weights in ounces and grams — including extra for the all-important second top-up pour.
Candle Wax Calculator
Container Shape
Container Dimensions (inches)
Batch Breakdown
Pro tip: Pour wax at 10–15°F below your wax's recommended pour temperature for better adhesion to the jar. Add fragrance oil just before pouring for best scent throw. The second pour fills the typical sinkhole that forms as wax cools and contracts.
How to Use the Candle Wax Calculator
Getting the wax-to-container ratio right is the first step to making consistent, professional-quality candles. Too little wax and your jar looks underfilled; too much and you have leftover wax that goes to waste. This candle wax calculator removes the guesswork by computing exact wax weights based on your container geometry, your chosen wax type, and your fragrance load percentage.
Step 1: Choose Your Container Shape
Select from three container types: Cylinder / Round Jar, Square / Rectangle, or Mason Jar Presets. Most commercial candle jars are cylindrical — enter the interior diameter (measure across the inside of the jar, not the outside) and the fill height (how deep you plan to fill it, typically leaving about half an inch from the top). For square or rectangular tins, enter interior width, depth, and fill height. If you are using standard Ball mason jars, the presets fill in the volume automatically based on common jar sizes.
Step 2: Select Your Wax Type
Each wax has a different density, which directly affects how much weight you need to fill a given volume. Soy wax (0.85 g/ml) is the lightest and most popular for container candles — it adheres well to glass and burns cleanly. Paraffin (0.90 g/ml) has excellent fragrance throw and a lower cost. Beeswax (0.96 g/ml) is the densest, burns longest, and produces a subtle honey scent. Coconut wax (0.89 g/ml) is a premium natural option that holds fragrance exceptionally well. Selecting the correct wax type ensures the weight calculation reflects your actual material.
Step 3: Set Your Fragrance Load
The fragrance load slider controls what percentage of the total wax weight will be fragrance oil. A 6% load is a good starting point for sensitive or lightly scented candles. 8–10% is the most common range for a strong home fragrance. 12% is near the maximum that most waxes can bind without the oil pooling or sweating on the surface. Paraffin typically tolerates higher loads; soy wax works best at 6–10%. The fragrance oil weight shown in the results is already factored out separately — do not add it on top of the wax weight; the wax calculation already accounts for the ratio.
Step 4: Enter the Number of Candles
If you are making a batch, enter how many candles you plan to pour. The batch breakdown section shows total wax and fragrance oil for the entire run, making it easy to measure out materials in one go rather than calculating per candle and multiplying manually.
Step 5: Read the Results and Prepare Your Pour
The results show the container volume in cubic inches, wax weight in both ounces and grams (per candle and per batch), fragrance oil weight, and an estimated dye amount if you entered one. The highlighted "Wax + 10% for Second Pour" row tells you the total wax to melt for your session — this built-in buffer ensures you have enough for the touch-up pour that fills the sinkhole that forms as wax cools and contracts. Switch between inches and centimeters using the unit toggle at the top of the tool.
Frequently Asked Questions
How much wax do I need to fill a candle jar?
The amount of wax depends on the container volume and wax type. Soy wax has a density of about 0.85 g/ml, paraffin about 0.90 g/ml, beeswax about 0.96 g/ml, and coconut wax about 0.89 g/ml. Enter your container dimensions and wax type into this calculator to get an exact weight in ounces and grams, including a 10% extra for the second pour.
What is fragrance load percentage for candles?
Fragrance load is the percentage of fragrance oil added to the wax by weight. Most soy wax candles use 6–10%, while paraffin can hold up to 12%. A 10% load on 100g of wax means adding 10g of fragrance oil. Higher loads increase scent throw but can affect burn quality if the wax becomes oversaturated. Start at 6–8% for first batches and adjust upward.
Why do candles need a second pour?
As candle wax cools, it contracts and often creates a sinkhole or depression around the wick. A second top-up pour fills this void and creates a smooth flat surface. Most candlemakers add 10–15% extra wax to their batch to have enough for these touch-up pours. This calculator automatically adds 10% extra to the second-pour estimate.
What is the difference between soy wax and paraffin wax for candles?
Soy wax is plant-based, burns slower and cooler, and has a lower density (0.85 g/ml) than paraffin, meaning you need less weight to fill the same volume. Paraffin is petroleum-derived, has better fragrance throw capacity (up to 12% load), burns slightly hotter, and costs less. Beeswax is natural and purifying but expensive; coconut wax blends well and has excellent scent throw.
How do I measure a candle container for the calculator?
For a cylinder jar, measure the interior diameter (across the inside) and the interior height (how deep it can be filled, not the outer height of the jar). For a square or rectangular container, measure the interior width, depth, and height. Measure in inches or centimeters based on your unit preference. Leave a small gap at the top — do not fill to the brim.
Is this candle wax calculator free to use?
Yes, the Candle Wax Calculator is completely free. There is no signup, no account, and no limit on how many calculations you can run. All calculations happen locally in your browser — no data is sent to any server.
Can I calculate wax for multiple candles at once?
Yes. Enter the number of candles you want to make in the 'Number of Candles' field. The calculator multiplies the single-candle wax weight by that count and shows you the total batch weight for wax, fragrance oil, and dye — everything you need to prepare your pour session.
How much fragrance oil do I need per pound of wax?
At a 10% fragrance load, you need 1.6 oz (about 45g) of fragrance oil per pound of wax. At 6%, that is roughly 1 oz per pound; at 12%, about 1.9 oz. This calculator shows fragrance weight in both ounces and grams based on your container dimensions, wax type, and the fragrance percentage you set.