Wax Melt Fragrance Calculator
Calculate how much fragrance oil to add to your wax melts by weight. Wax melts run higher than candles — this tool defaults to the 8–12% melt range for soy, paraffin, and coconut-soy melt waxes.
Wax melts hold more than candles — 8–12% is the typical working range.
Enter to see fragrance cost per melt and batch total.
Results
How much fragrance do wax melts need
Wax melts run a higher fragrance load than candles — typically 8–12%, versus the 6–10% used for container candles. Fragrance load is the percentage of fragrance oil relative to the weight of wax, not the total poured weight of the melt:
FO weight = wax weight × (FL% ÷ 100)
Example: 3 oz melt wax × 10% = 0.3 oz fragrance oil
Measuring by weight is the only reliable way to hit your load. Fragrance oils are denser than melted wax, so a "tablespoon" of oil weighs more than a tablespoon of wax — volume measurements drift batch to batch. Use a digital scale in ounces or grams. The calculator above works both directions: enter wax weight and a target percentage to get the oil amount, or enter both weights to reverse-calculate the percentage you are already running.
Why wax melts hold more fragrance than candles
The difference comes down to one thing: a wax melt is never lit. A candle's fragrance load is capped by the burn — too much oil clogs the wick, mushrooms the flame, and makes the candle soot and sweat. Everything about a candle's load is a compromise with the flame.
A wax melt has no wick and no flame. It sits on an electric or tea-light warmer and releases scent slowly as the wax warms. With nothing to clog and nothing to burn, the wax can safely carry more fragrance — which is exactly what you want, because the warmer never gets as hot as a candle's melt pool. Running melts at 8–12% instead of a candle's 6–10% is what gives them their signature strong, room-filling throw.
Fragrance load by melt wax type
| Melt wax | Recommended range | Maximum | Add fragrance at |
|---|---|---|---|
| Soy melt wax | 8–12% | 12% | 180–185°F |
| Paraffin melt wax | 8–12% | 12% | 195–200°F |
| Coconut-soy melt blend | 8–12% | 12% | 170–180°F |
Clamshell vs mold pouring
Most sellers pour into six-cavity clamshells — the snap-apart plastic packaging customers break into single cubes. When you calculate for clamshells, "wax weight per unit" means the wax in one full clamshell, and the number of units is how many clamshells you are filling. A standard clamshell holds roughly 2.5–3 oz of wax.
Silicone and tin molds work the same way in the math — set "wax weight per unit" to the wax in a single mold and enter how many you are pouring. Because throw scales with the amount of wax melting at once, a heavier cube throws more than a thin one at the same percentage, so keep your cavity size consistent if you want repeatable results across a batch.
Add fragrance at the right temperature
Temperature matters as much as percentage. Add fragrance too hot and the volatile top notes flash off before you pour; too cold and the oil will not fully incorporate, leaving it to separate later. Add fragrance to soy melt wax at 180–185°F, paraffin melt wax at 195–200°F, and coconut-soy blends at 170–180°F, then stir gently for about two minutes so the oil disperses evenly.
Making candles instead? A candle's fragrance load is capped lower by the wick and flame — use the fragrance load calculator for containers, which defaults to the 6–10% candle range.
Frequently Asked Questions
How much fragrance oil do wax melts need?
Wax melts typically run 8–12% fragrance load — higher than candles, which sit around 6–10%. Fragrance load is a percentage of the wax weight, so a 3 oz clamshell of melt wax at 10% takes 0.3 oz of fragrance oil. Start at 10% for a strong, reliable throw and adjust from there. Always measure by weight, never by volume.
Why do wax melts hold more fragrance than candles?
A candle has a wick and a flame, and the fragrance load is limited by what the wax can hold while still burning cleanly — too much oil clogs the wick and ruins the burn. Wax melts are never lit. They warm slowly on a warmer, so there is no flame or wick to worry about, and the wax can carry a higher fragrance load safely. That is why melts are poured at 8–12% instead of the 6–10% used for container candles.
Do wax melts need to cure?
Wax melts benefit from a short rest but do not need the long cure a container candle does. A few days for soy melt wax lets the fragrance bind more evenly, but because melts are warmed rather than burned, throw is far less cure-dependent than it is for candles. Many makers pour, cool overnight, and test the next day. The bigger levers for melt throw are fragrance load and the fragrance oil itself.
At what temperature do you add fragrance to melt wax?
Add fragrance at the temperature recommended for your wax: soy melt wax at 180–185°F, paraffin melt wax at 195–200°F, and coconut-soy melt blends at 170–180°F. Too hot flashes off the top notes; too cold and it will not fully incorporate. Stir gently for about two minutes.
Is fragrance load for wax melts based on wax weight or total weight?
By wax weight — the same as candles. Fragrance load is the ratio of fragrance oil to wax, not to the total poured weight. If you pour 6 oz of melt wax across two clamshells at 10%, that is 0.6 oz of fragrance oil total, split between them. Basing the percentage on total weight instead of wax weight is the most common mistake makers make.