Candle Wax & Fragrance Load Calculator

Work out exactly how much wax and fragrance oil you need for any container, in seconds. Pick your wax, set your fragrance load, and get per-candle and batch amounts that always add up to the fill your jar can actually hold - plus what each candle costs to make. Free, no sign-up, and it runs entirely in your browser.

How much wax do I need?

Multiply your container's volume in fluid ounces by your wax's specific gravity to get the total fill weight, then divide that total by 1 plus your fragrance load. An 8 fl oz jar of soy wax at an 8% load takes 6.37 oz of wax and 0.51 oz of fragrance oil.

Written out, the calculation runs in three steps:

• Total fill weight (oz) = container volume (fl oz) × wax specific gravity. For the 8 fl oz soy jar: 8 × 0.86 = 6.88 oz.
• Wax weight = total fill ÷ (1 + fragrance load). 6.88 ÷ 1.08 = 6.37 oz.
• Fragrance oil weight = wax × fragrance load. 6.37 × 0.08 = 0.51 oz.

If you do not know your container's volume, use the water-weight method instead: fill the container with water to your intended pour line, weigh the water, and multiply that weight by the wax's specific gravity. Both methods treat the container's water capacity as a stand-in for volume, which is a close approximation rather than a lab-grade measurement - more than accurate enough for pouring candles, and the buffer field covers the rest.

What is fragrance load?

Fragrance load is the amount of fragrance oil expressed as a percentage of the wax weight - not of the finished candle. It is an additive measure: an 8% load means 8 oz of oil for every 100 oz of wax. One pound of wax (16 oz) at an 8% load takes 16 × 0.08 = 1.28 oz of fragrance oil.

Most makers work between 6% and 10%. Going higher rarely means a stronger candle: every wax has a maximum load it can bind, usually somewhere around 10-12%. Past that point the extra oil does not dissolve into the wax - it can pool on the surface, sweat out as the candle cures, weaken scent throw, and become a fire hazard. The calculator warns you above 12% and asks you to confirm your wax's rated maximum before pouring. Zero is valid too: an unscented candle is just wax, and the calculator will tell you so.

Why we divide by 1 + fragrance load

Here is the trap in candle math. Suppose your jar holds 6.88 oz of wax-weight. If you call that entire 6.88 oz "wax" and then add 8% fragrance oil on top, you are pouring 6.88 + 0.55 = 7.43 oz of material into a container that holds 6.88 oz. That is an overpour - the recipe physically does not fit, and you find out with a wet, oily mess at the pour line.

This calculator fixes the total first. The jar's fill weight is the budget; wax and fragrance oil have to share it. Since the oil is a fixed percentage of the wax, the wax must be total ÷ (1 + load), and the oil is whatever remains. The two numbers always sum exactly to the fill weight, so the recipe fits the jar every time. Scale it by candle count and an optional buffer for spills, and your batch quantities stay honest too.

Fluid ounces vs ounces: the classic candle mistake

An 8 oz candle jar is 8 fluid ounces - a volume. The wax that fills it weighs less than 8 ounces, because candle wax is less dense than water. Mixing up the two units is the single most common reason recipes come out wrong: order 8 oz of wax by weight for every 8 fl oz jar and you will consistently buy about 15% too much soy wax, and your cost-per-candle math drifts with it.

The bridge between the two units is specific gravity - how dense the wax is relative to water. Water weighs about 1.04 oz per fluid ounce; at candle-recipe precision the convenient 1-to-1 approximation is standard practice, so an 8 fl oz jar of soy wax at 0.86 specific gravity holds roughly 8 × 0.86 = 6.88 oz of wax-weight. Labels in the calculator mark every input as volume or weight so the two never get crossed.

Wax specific gravity table

These are the values the calculator uses. Soy, paraffin, and beeswax figures are widely published; coconut and parasoy blends vary by manufacturer, so those are typical values - if your supplier's data sheet says otherwise, use the Custom option and enter the exact number.

A lower specific gravity means lighter wax: the same jar holds fewer ounces of soy than of beeswax. That is why switching wax types changes how much a "full" jar weighs, and why your fragrance oil quantity changes with it even at the same load percentage.

Costing a batch of candles

Quantities are only half the recipe - the other half is money. Open the cost section under the calculator, enter what you pay for wax per pound, fragrance oil per ounce, and each container and wick, and the calculator prices every pour.

Take the 8 fl oz soy example: 6.37 oz of wax is 0.398 lb, which at $6.00 per pound costs $2.39. The 0.51 oz of fragrance oil at $2.00 per ounce adds $1.02. With a $1.20 jar and a $0.15 wick, each candle costs $4.76 in materials, and a twelve-candle batch runs about $57.10. Leave any price blank and the calculator simply notes what the total does not include - no fake precision.

When you are ready to go beyond materials, our free bill of materials template and cost calculator adds scrap percentage, labor, overhead, and margin-versus-markup math on top of the same recipe. You can also download the recipe from this page as a CSV and paste it straight into your own spreadsheet.

From recipe to real inventory

A calculator answers one pour. A growing candle business has a different problem: how much wax and fragrance is actually left on the shelf, which fragrance oil lot went into which batch, and what this month's production really cost. That is inventory management, and a recipe page cannot do it for you.

Evenbatch is inventory software built for small makers: it stores your recipes as bills of materials, deducts wax, fragrance, jars, and wicks as you produce, tracks lots and shelf life, and costs every batch automatically - all synced honestly with QuickBooks Online. If you are weighing your options, our guide to inventory software for candle and soap makers walks through what to look for. Or skip ahead and start a free Evenbatch trial - your recipes from this calculator drop straight in.

See something outdated or incorrect on this page? Email support@evenbatch.com and we will correct it within 48 hours. Last updated: July 18, 2026.