Candle Making Calculator - Online Wax & Fragrance Oil Ratio

Fragrance load (or fragrance oil ratio) is the percentage of fragrance oil relative to the weight of the wax. For example, an 8% fragrance load means you add 8 grams of fragrance oil for every 100 grams of wax. This is the standard way candle makers measure and communicate scent strength. The total blend weight would be 108g (100g wax + 8g FO).

Different waxes have different maximum fragrance load capacities—exceeding the recommended range can cause the fragrance oil to seep out (sweating), poor burn performance, or even fire hazards.

Soy wax typically holds 6% to 10% fragrance oil. For most soy waxes (like Golden Brands 464), 8% is the sweet spot—providing excellent hot throw without causing wicking issues or fragrance seepage. Some premium soy waxes can hold up to 10–12%, but always check your wax manufacturer's specifications.

Pro tip: If you're using essential oils instead of synthetic fragrance oils, start with a lower ratio (4–6%) as essential oils can be more volatile and may cause burning issues at higher concentrations.

To calculate for multiple candles:

1. Total wax = Number of containers × Wax weight per container
2. Fragrance oil = Total wax × Fragrance load percentage (e.g., × 0.08 for 8%)
3. Total blend = Total wax + Fragrance oil
4. Add waste compensation = Total wax × waste percentage (we recommend 5%)

Our calculator above automates all of this—simply enter your numbers and get instant results. You can also use the multi-container mode for different sized jars.

Poor hot throw can result from several factors:

• Insufficient fragrance oil – Try increasing your fragrance load within the wax's recommended range.
• Adding FO at wrong temperature – If wax is too hot, fragrance may evaporate; too cool and it won't bind properly.
• Inadequate cure time – Soy wax needs 7–14 days to cure for optimal scent throw.
• Wick size mismatch – A wick that's too small won't create a proper melt pool for scent dispersion.
• Low-quality fragrance oils – Not all oils are created equal; use candle-grade fragrance oils.

Use our calculator to ensure you're using the right fragrance ratio, then experiment with cure times and wick sizes.

Yes, you can absolutely use too much fragrance oil! Exceeding your wax's maximum fragrance load can cause:

• Fragrance seepage/sweating – Excess oil pools on the candle surface
• Wicking problems – Clogged wicks that struggle to stay lit
• Safety hazards – Excess oil can ignite if it pools near the flame
• Poor burn quality – Tunneling, flickering, or self-extinguishing candles
• Wasted materials – Beyond the wax's capacity, extra oil adds no benefit

Always stay within your wax manufacturer's recommended fragrance load range. Our calculator's wax type selector shows the safe range for each wax.

These terms are often used interchangeably but can mean different things:

• Fragrance Load (most common): FO weight ÷ Wax weight × 100%. Our calculator uses this method—8% means 8g FO per 100g wax.
• Fragrance Ratio (less common): FO weight ÷ Total blend weight × 100%. In this method, 8% means FO makes up 8% of the total blend.

Our calculator uses the fragrance load method (FO relative to wax weight), which is the industry standard and what most candle supply manufacturers specify. For example, at 8% load with 200g wax, you get 16g FO and 216g total blend.

An 8 oz jar doesn't hold 8 oz of wax—containers are typically measured by water volume, and wax is less dense than water. As a rule of thumb:

• An 8 oz jar typically holds about 5.5–6.5 oz (155–185g) of wax
• A 4 oz jar holds about 2.8–3.2 oz (80–90g) of wax
• A 16 oz jar holds about 11–13 oz (310–370g) of wax

The best approach is to fill one container with water, weigh the water (1g water ≈ 1ml), then multiply by 0.86 (the approximate density ratio of wax to water). Or simply test-fill one jar with wax and weigh it. Enter that measured weight into our calculator above.

Always measure by weight using a digital scale. Fragrance oils have different densities—1 fluid ounce of one oil might weigh 28g while another weighs 32g. Using volume (teaspoons, tablespoons, or fluid ounces) leads to inconsistent results.

A good digital scale accurate to 0.1g is an essential tool for candle making. Our calculator provides results in weight units (grams or ounces) for this reason. If you need volume estimates, check your specific fragrance oil's density/specific gravity from the supplier's SDS sheet.

We recommend adding 5–10% extra wax to account for:

• Wax residue on melting pitcher walls
• Wax stuck to stirring utensils
• Small spills during pouring
• Wax that clings to the pouring spout
• Test candles or slightly overfilling some containers

Our calculator's waste compensation slider defaults to 5%. For very small batches (fewer than 4 candles), consider 10% since the relative loss is higher. For large production runs, 3–5% is usually sufficient.

Our candle making calculator uses the standard industry formula:

1. Total Wax = Sum of (container quantity × wax per container) for all container rows
2. Fragrance Oil = Total Wax × (Fragrance Load % ÷ 100)
3. Total Blend = Total Wax + Fragrance Oil
4. With Waste = Total Wax × (1 + Waste % ÷ 100)

All calculations update in real-time as you adjust inputs. You can switch between grams and ounces, choose from common wax types with their recommended fragrance load ranges, and account for multiple container sizes. The results show exactly how much wax and fragrance oil to measure out for your project.