Candle Burn Time Calculator
Calculate how long your candle will burn — use the quick estimate before pouring or run a burn test for label-accurate results. Supports soy, paraffin, beeswax, and coconut wax.
Results
Label tip: Real-world burn time varies ±10–15% based on wick trim, airflow, and room temperature. The label-safe figure rounds down conservatively.
How candle burn time is calculated
There are two ways to estimate how long a candle will burn. The first is an hours-per-oz estimate based on wax type — a useful number before you've poured a single candle, and accurate enough for recipe planning and rough product descriptions. The second is a burn test, where you weigh a finished candle, burn it for a controlled period, weigh it again, and use the wax consumption rate to project total burn hours.
The estimate method is fine for planning. Use it to compare wax types, set expectations, or describe your candles before you have test data. But if you're putting a burn time on a product label, a hang tag, or an Etsy listing, you need a burn test. The estimate gives you a ballpark; the burn test gives you a defensible number tied to your actual recipe, wick, and container.
The calculator above handles both. Switch to Burn Test mode, enter your before and after weights and the hours burned, and it calculates your burn rate and projects total hours from your full wax fill weight.
Burn time by wax type
| Wax type | Burn rate | 8 oz candle estimate | Notes |
|---|---|---|---|
| Soy (container) | 5–7 hrs/oz | 40–56 hrs | Most popular for container candles |
| Paraffin | 4–5 hrs/oz | 32–40 hrs | Burns hotter and faster |
| Beeswax | 6–8 hrs/oz | 48–64 hrs | Slowest burn, natural scent |
| Coconut wax | 5–7 hrs/oz | 40–56 hrs | Similar to soy, slightly creamier burn |
| Coconut-soy blend | 5–6.5 hrs/oz | 40–52 hrs | Common in premium container candles |
What affects candle burn time
Wick size is the single biggest variable in real-world burn time. An oversized wick creates a melt pool that is too deep and too wide, pulling wax faster than the flame can efficiently consume it. The result is a candle that burns significantly shorter than the estimate and often leaves wax residue on the glass from tunneling. If your candles consistently burn faster than expected, sizing down one wick grade is the first thing to test. The wick size calculator can help you find the right starting point for your container diameter and wax type.
Fragrance load also plays a role, though less dramatically at typical percentages. At 6–10% of wax weight, fragrance oil has minimal effect on burn time. Above 10%, excess fragrance oil can partially clog the wick, causing mushrooming, inconsistent burn, and a shorter effective burn life. Staying within the wax manufacturer's recommended fragrance load is good practice for both scent throw and burn performance.
Airflow accelerates burn rate measurably. A candle sitting near a vent or open window may burn 15–25% faster than the same candle in still air. This is worth noting on product descriptions and safety labels — "burn in a draft-free area" is standard language for a reason. Finally, wick trim length matters: an untrimmed wick develops a mushroom of carbon that increases flame size, heat output, and wax consumption. Trimming to ¼ inch before each burn is the most reliable way for consumers to get the rated burn time from your candle.
How to do a candle burn test
Start by weighing your finished candle on a digital scale before lighting. Record this weight in ounces or grams — if you're weighing the whole candle including the jar, note the container weight separately so you can subtract it later. Place the candle on a level, draft-free surface and light it.
Burn for 3–4 hours. This is the interval used by CandleScience and most professional makers because it's long enough to establish a full melt pool and a stable burn rate, but short enough to complete in a single session. The 4-hour mark is also the industry standard for candle safety testing. Once the time is up, extinguish the flame and let the candle cool completely to room temperature before reweighing — hot wax is less dense and will give you a slightly inaccurate reading.
With both weights and your burn duration recorded, enter the numbers into the Burn Test mode above. For better accuracy, run two candles simultaneously from the same batch and average the results. Variation between two candles from the same pour indicates inconsistency in your wick tab placement, fragrance mixing, or pour temperature — all worth investigating before you add burn time claims to your labels.
How to write burn time on a candle label
Candle labels should state an approximate burn time, rounded down conservatively. ASTM F2601 doesn't mandate a specific format, but the widely used convention is "Approximately X hours" or "Up to X hours." Both are acceptable; "up to" sets a ceiling rather than an expectation, which gives you more margin when real-world variables like airflow and wick trim reduce burn time slightly.
Use the label-safe figure from the calculator rather than the raw estimate. It applies conservative rounding — to the nearest 0.5 hour for short burns, the nearest hour for mid-range candles, and the nearest 5 hours for long-burning candles — and accounts for the ±10–15% real-world variation that every candle experiences. Once you have your burn time locked in, the next step is making sure your price reflects the quality and burn life you're offering. The candle pricing calculator can help you build a price that covers your costs and turns a real profit.
Frequently Asked Questions
How long should an 8 oz soy candle burn?
An 8 oz soy candle typically burns 40–56 hours using the hours-per-oz estimate (5–7 hrs/oz). In practice, most well-made 8 oz soy candles fall in the 45–50 hour range. Variables are wick size and fragrance load — an over-wicked candle can burn through in 30 hours while an under-wicked one may tunnel before using all the wax.
What is a good burn time for a candle?
For container candles, 1 hour of burn time per dollar of retail price is a widely-used consumer benchmark. A $22 candle should burn at least 22 hours. Most handmade soy candles easily exceed this, which is a legitimate selling point worth including on your label and product listing.
Does soy wax really burn longer than paraffin?
Yes, measurably. Soy wax burns at roughly 5–7 hrs/oz vs paraffin at 4–5 hrs/oz — about 25–40% longer for the same wax weight. The difference is density: soy is slightly denser and has a lower melt point, so it releases wax more slowly. For a candle seller, this is a genuine product advantage, not just marketing.
How do I calculate burn time for a candle label?
Run a burn test: weigh the candle, burn for 3–4 hours, weigh again. Divide wax consumed by hours burned to get your burn rate per hour. Divide total wax weight by burn rate to get estimated total hours. Round down conservatively — most makers reduce by 10–15% to account for real-world variation. The Burn Test mode in the calculator above does this math for you.
Does fragrance oil affect burn time?
At typical loads (6–10% of wax weight), fragrance oil has minimal effect on burn time. At loads above 10%, fragrance oil can partially clog the wick, causing mushrooming or an uneven burn that shortens effective burn time. This is one reason keeping fragrance load within the wax manufacturer's recommended range matters for both scent throw and burn performance.
Why did my candle burn faster than the estimate?
The most common cause is wick size — an oversized wick creates a melt pool that is too deep, consuming wax faster than necessary. Other causes: burning in a drafty area, not trimming the wick to ¼ inch before each burn, or a high fragrance load. If your candle consistently burns 20–30% faster than your estimate, size down one wick and retest.