Candle Fragrance Load Calculator
Calculate exactly how much fragrance oil to add to your candle wax by weight. Enter your wax weight, choose your fragrance load percentage (3–12%), and select your wax type — the calculator shows fragrance needed in both grams and ounces, total batch weight, and warns you if you are exceeding the safe maximum for your wax. All calculations run privately in your browser.
How Fragrance Load Works
Fragrance load is the ratio of fragrance oil to wax measured by weight, expressed as a percentage. A fragrance load of 8% means you add 8 grams of fragrance oil for every 100 grams of wax. This simple formula determines how strongly your finished candle will throw scent — both when unlit (cold throw) and when burning (hot throw).
The correct fragrance load is not the same across all candle types. Each wax has a saturation point — the maximum amount of fragrance oil it can chemically bind. Go beyond that point and the excess fragrance oil does not bond to the wax, causing it to seep to the surface, pool around the wick, or in worst cases create a fire hazard. Staying within the recommended range for your wax type ensures a clean, safe burn with optimal scent throw.
This calculator uses the weight-based formula: fragrance oil (g) = wax weight (g) × (fragrance load % ÷ 100). If you enter ounces, the calculator converts to grams for the calculation and then converts the result back, so you always get both units in the output. Fragrance load is always measured as a percentage of the wax weight, not the total batch weight.
Fragrance Load by Wax Type
Different waxes have different maximum fragrance loads based on their molecular structure and density. Soy wax is the most popular for container candles and can hold up to 12% fragrance oil, though 6–10% is the typical working range. Paraffin wax is denser and maxes out at around 9% — it is widely used in pillar and taper candles. Beeswax is the most natural option but the most restrictive at 6% maximum, and it already has a naturally sweet honey scent that competes with added fragrance. Coconut wax falls in the middle at 10% maximum and is valued for its clean burn and excellent scent throw.
When switching wax types, always recalculate your fragrance amount. The same candle recipe that works perfectly in soy wax can produce seepage or surface pooling if the fragrance load is too high for paraffin or beeswax. Always start at the lower end of the range for a new wax and test before scaling up your batch.
Tips for Maximum Scent Throw
Fragrance load is the biggest factor in scent throw, but it is not the only one. The temperature at which you add fragrance oil to the melted wax matters — most waxes should be at 65–75 °C (149–167 °F) when you add fragrance and stir for two full minutes. Adding fragrance when the wax is too hot causes volatile top notes to burn off, reducing scent complexity. Adding it too cool can cause poor binding and frosting in soy wax.
Cure time also has a significant effect. Soy candles in particular benefit from a cure of 48–72 hours after pouring before being burned. During this time the fragrance molecules continue to bind with the wax matrix, improving cold throw and increasing the strength of hot throw on the first burn. Paraffin candles typically need only 24 hours. If a candle smells weak right after pouring, give it 48 hours before drawing any conclusions about the fragrance load.
Fragrance quality matters as much as quantity. Higher-quality fragrance oils formulated specifically for candle making (with a high flashpoint, typically above 75 °C) will outperform cheap fragrance oils even at the same load percentage. Always check the flashpoint and usage rate recommended by your fragrance supplier — some fragrance oils are rated for use up to only 6% even in soy wax.