Candle Wax Calculator
Calculate exactly how much wax and fragrance oil you need for any candle batch. Free candle wax calculator for soy, coconut, paraffin, and beeswax.
Your results
You'll need about 2.3 lbs of soy (coconut blend) for this batch.
Shop soy coconut wax on AmazonHow much wax do I need for candles?
The amount of wax you need depends on three things: your container size (in fluid ounces), how many candles you're making, and the type of wax you're using. Because wax is denser than water, you can't simply fill a container to the brim and expect that to match your wax weight. Instead, every wax type has a fill ratio — a multiplier that accounts for how the melted wax settles and contracts as it cools.
The general formula is:
Wax needed (oz) = Container size (oz) × Fill ratio × (1 − Fragrance load %)
For example, if you have an 8 oz container, are using pure soy wax (fill ratio 0.85), and a 10% fragrance load:
- Wax per candle = 8 × 0.85 × 0.90 = 6.12 oz
- Fragrance per candle = 8 × 0.85 × 0.10 = 0.68 oz
The calculator above handles all of this for you — just enter your container size, number of candles, wax type, and fragrance load and it updates instantly.
Wax type comparison
Different waxes have different densities and fill ratios. Here's a quick overview to help you choose the right wax for your project:
| Wax Type | Fill Ratio | Best For | Pros | Cons |
|---|---|---|---|---|
| Soy (pure) | 0.85 | Container candles | Clean burn, eco-friendly, easy to color | Can frost, may need re-pour |
| Soy/Coconut blend | 0.87 | Container candles | Better scent throw, smoother finish | More expensive than pure soy |
| Coconut | 0.92 | Container & pillar | Excellent scent throw, creamy look | Higher cost, lower melting point |
| Paraffin | 0.90 | Pillars, votives, containers | Strong scent throw, clear glass adhesion | Petroleum-based, not eco-friendly |
| Beeswax | 0.95 | Pillars, tapers, rustic containers | Natural, long burn time, honey scent | Expensive, can overpower fragrance |
How to measure fragrance load
Fragrance load is the percentage of fragrance oil relative to the total wax weight (not the container volume). A 10% fragrance load means 10 parts fragrance oil per 90 parts wax by weight.
Most soy waxes perform well at 6–10%. Coconut wax can handle up to 12% or more. Always check your wax manufacturer's recommended maximum fragrance load — going over it can cause issues like oil pooling on top, poor adhesion to the glass, or fire hazards.
Use a digital kitchen scale accurate to 0.1 oz (or 1 gram) for the most consistent results. Volume measurements (tablespoons, cups) are unreliable for candle making because densities vary.
Tips for accurate wax measurement
- Always weigh, never pour by volume. A fluid ounce of fragrance oil weighs differently than a fluid ounce of wax — use a kitchen scale for both.
- Account for waste. Add 5–10% extra wax to your order to account for spillage, top-offs, and test candles.
- Test before you batch. Always make a test candle with a new wax or fragrance combination before committing to a large batch.
- Keep a log. Write down your exact measurements, pour temperature, and cure time for every batch so you can reproduce winners and avoid repeating mistakes.
Frequently Asked Questions
How many ounces of wax do I need for a 6 oz candle?
For a 6 oz container with pure soy wax at 10% fragrance load, you need approximately 4.59 oz of wax and 0.51 oz of fragrance oil per candle. The exact amount varies by wax type — use the calculator above to get precise numbers.
What is a "fill ratio" and why does it matter?
A fill ratio accounts for the fact that melted wax contracts as it solidifies. If you simply filled your container with water to measure its volume, you'd over-order wax because solid wax takes up slightly less volume than the same weight of water. The fill ratio (e.g., 0.85 for pure soy) means you multiply your container's fluid ounce capacity by 0.85 to get the actual wax weight needed.
Can I use this calculator for pillar or taper candles?
This calculator is optimized for container candles. For pillars and tapers, the fill ratios can be slightly different because you're pouring into molds rather than containers — but the same math applies. You can still use this as a close estimate and adjust based on your test pours.
How much wax do I need for 50 candles?
It depends on your container size and wax type. For 50 candles in 8 oz containers using soy/coconut blend (fill ratio 0.87) at 10% fragrance load:
- Wax per candle: 8 × 0.87 × 0.90 ≈ 6.26 oz
- Total wax: 6.26 × 50 = 313 oz ≈ 19.6 lbs
- Total fragrance: (8 × 0.87 × 0.10) × 50 = 34.8 oz ≈ 2.2 lbs
Use the calculator above — just set the number of candles to 50 and it'll compute everything instantly.
Does fragrance load affect how much wax I need?
Yes! Fragrance oil replaces a portion of your wax by weight. At 10% fragrance load, your wax usage is 10% lower than if you used no fragrance. This is why the calculator separates "wax needed" from "fragrance needed" — both numbers change as you adjust the fragrance load slider.