1Use a burn test
Enter the candle's cooled weight before and after testing plus the recorded burn time. Container candles also use the empty vessel weight.
Candle Burn Time Calculator
Free candle-making tool
Estimate candle burn time from real burn data
Use cooled before-and-after burn-test weights to calculate your candle's measured burn rate, total estimated life and time remaining. If you already know the burn rate, enter it directly for a faster estimate.
2I already know my burn rate
Enter usable candle fill and a measured rate in g/hr or oz/hr. The calculator estimates total burn time immediately.
Use the result as an estimate of lifetime across normal burn sessions—not as a safe continuous-burn duration. Burn rate can change as a candle burns lower, so confirm a finished product with a supervised full-life burn test.
Candle Burn Time Calculator & Wick Test
Use a burn test or a measured burn rate to estimate candle life, calculate hourly wax use and check wick performance.
1
Burn Test Measurements
Candle Type
Weight before burning (cooled)
Weight after burning (cooled)
Total burn time of this test
Weight of the empty container
Tip: Always let the candle cool completely before weighing.
2 Wick Performance Check6 quick burn observations for a more reliable wick assessment Optional
Wick performanceReady when you are
This check is optional and does not affect your burn-time calculation.
Method: usable candle fill ÷ measured average burn rate.
Burn rate can change as the candle burns down. Confirm the finished candle through a supervised full-life burn test.
Your Burn Test Results
hours
Enter the four measurements to calculate your estimate.
Wick status
Waiting for burn-test data
Wick Performance & Burn Rate
Measured Burn Rate—
Burn-test measurements give an immediate preliminary wick status. Complete the optional Wick Performance Check to refine it with flame, melt-pool and soot observations.
1
Known Burn Rate
Enter the candle’s usable wax fill and a burn rate measured from this candle or a genuinely comparable tested candle. The estimate updates live.
g
Burnable fill only—exclude the container and any known safe-stop remainder.g/hr
Burn rate = weight consumed ÷ recorded burn hours.Your Burn Time Estimate
Estimated total burn time
hours
Enter usable candle fill and your measured burn rate.
Usable Fill—
Burn Rate—
Equivalent Rate—
How to calculate candle burn time
The strongest estimate comes from measuring how much wax your actual candle consumes per hour. The calculator also supports a known burn rate when you already have reliable test data.
Calculate from a burn test
Use this method when you can weigh the same cooled candle before and after a recorded test period.
Weight loss during the test gives the average burn rate. For a container candle, subtract the empty vessel from the starting weight so glass is never counted as fuel. For a pillar or other freestanding candle, there is no vessel weight to subtract.
Wax consumedBefore-test cooled weight − after-test cooled weight
Average burn rateWax consumed ÷ recorded burn hours
Initial candle fillBefore-test weight − empty container weight
Usable fillInitial fill − measured safe-stop remainder, if known
Estimated total burn timeUsable candle fill ÷ average burn rate
Estimated time remainingRemaining usable wax ÷ average burn rate
- 1Weigh the cooled candle before the test
Use the complete candle weight. For container candles, also record the clean empty vessel weight once.
- 2Run a normal supervised burn session
Record the actual time burned. Keep test conditions consistent and follow the candle and wick supplier's safety instructions.
- 3Cool completely and weigh again
Do not weigh while the wax is still liquid or warm enough to create an inconsistent reading.
- 4Repeat across the candle's life
Burn rate may change as the candle burns lower. Combining several measured cycles generally gives a stronger estimate than relying on one short session.
Worked example
Before-test weight450 g
After-test weight430 g
Empty container250 g
Recorded burn time4 hours
Wax consumed20 g
Average burn rate5 g/hr
Initial fill: 200 g · Estimated total burn time: 40 hours · Estimated time remaining: 36 hours
About the wick status: the calculator can show a preliminary rate-only signal as soon as burn-test data is available. Because there is no universal g/hr or oz/hr value that proves a wick is correct, use the optional Wick Performance Check to add flame, melt-pool, soot, trim and carbon observations. If you need a starting wick candidate, use the Candle Wick Size Estimator.
Calculate from a known burn rate
Use this faster method when you already have a measured g/hr or oz/hr rate from the same candle or a genuinely comparable tested candle.
Estimated total burn timeUsable candle fill ÷ measured burn rate
Unit ruleUse matching units: g with g/hr, or oz with oz/hr
Example: a candle with 200 g of usable fill and a measured rate of 5 g/hr has an estimated total burn time of 40 hours. In ounces, 40 oz at 5 oz/hr equals 8 hours.
The calculator converts grams and ounces for you while preserving the same physical quantity. Changing the displayed unit does not change the underlying candle or the estimated time.
Safe-stop remainder and real-world limits
Not every gram of wax is necessarily available to burn safely.
If a previous full-life test shows a repeatable amount of wax remaining at the candle's safe stopping point, you can enter that measured remainder. The calculator subtracts it from usable fill. If you do not have a measured remainder, leave the option off rather than guessing.
Any calculated burn time is still an estimate. Wick size, candle diameter, wax formulation, fragrance, dye, vessel shape, airflow and burn-session pattern can change the real rate. Use the full-life test of the finished candle when you need a product claim or final wick decision.
Safety: never treat the estimated total hours as permission to burn a candle continuously. Always follow the finished candle's safety instructions and supervise every physical burn test.
Candle burn time calculator FAQs
Answers about burn-rate formulas, test accuracy, containers, wick performance, units and full-life testing.
How do you calculate candle burn time?
For a measured estimate, subtract the cooled post-burn weight from the cooled pre-burn weight to find wax consumed. Divide that by the recorded burn hours to get the average burn rate. Then divide usable candle fill by that rate to estimate total burn time.
What is candle burn rate?
Burn rate is the amount of candle fuel consumed per hour, usually shown as g/hr or oz/hr. Measure it by dividing the weight lost during a burn test by the total recorded burn time.
Do I include the jar weight in the calculation?
For a container candle, enter the empty container weight so the calculator can remove it from the starting candle weight. For a pillar or freestanding candle, select Pillar / Freestanding and no container weight is needed.
Can I calculate candle burn time in grams or ounces?
Yes. The calculator supports grams and ounces and converts the same physical measurements when you switch units. The estimated hours should remain the same after a unit change.
How accurate is a candle burn time calculator?
A result based on measured burn data is useful for estimating the candle you tested, but it is still an extrapolation. Burn rate can change as the candle burns lower, so several controlled cycles and a supervised full-life burn test provide stronger evidence.
Can burn rate tell me whether my wick is correct?
Not by itself. The calculator shows a clearly labelled preliminary rate-only signal for convenience, but there is no universal g/hr or oz/hr threshold that proves correct wicking. Use the Wick Performance Check and full-life testing to judge flame, melt pool, soot and wick behaviour together.
What does the Wick Performance Check look for?
It uses burn-cycle stage, flame behaviour, melt-pool behaviour and smoke or soot as the core observations, with wick trim and carbon buildup as supporting information. Mixed or early-cycle signs return More testing needed rather than forcing a wick-size decision.
How long should my burn test be?
Record one or more normal supervised burn sessions and enter the total time covered by the before-and-after weighings. Follow the safety instructions for the candle, wick and vessel, and let the candle cool completely before each final weight measurement.
What is the safe-stop wax remainder?
It is wax you have actually measured remaining when a previous full-life test reached the candle's safe stopping point. If you have reliable data, the calculator can subtract that remainder from usable fill. If you have not measured it, leave the option off.
Why can the estimated burn time change between tests?
The average burn rate may change as wax level, vessel temperature, melt-pool geometry and airflow change. Repeating the test across the candle's life gives you a better picture than relying on one early cycle.
Does fragrance oil affect candle burn time?
It can. Fragrance load and formulation can change fuel flow, melt-pool behaviour and the wick a candle needs. Retest whenever you make a meaningful change to fragrance, wax, dye, wick or vessel.
Can I use the calculator for pillar candles?
Yes. Choose Pillar / Freestanding. The calculator treats the before-test candle weight as the initial fill because there is no container weight to subtract. Physical pillar tests should still use a suitable heat-resistant holder and normal candle safety practices.
Turn burn-test data into a better next candle
Use the related calculators to adjust wick starting points, plan wax and fragrance, estimate cooling time and price a candle after testing.