Calculate
your craft.
Free calculators and guides for candles, incense, bath and herbal crafts.
Stop guessing. Start making.
Browse by craft
Calculators and guides, grouped by what you're making.
-
Candle Making
Free candle making calculators and reference guides: wax amounts, fragrance load, wick sizing, cure times, pouring temperatures, burn time and pricing.
-
Incense Making
How to make scented incense at home: dipping blank sticks and cones in DPG and fragrance oil, soak and dry times, and a calculator for the dipping solution.
-
Bath & Body Making
Ratio calculators for bath and body products, by weight: whipped body butter, lotion bars, sugar and salt scrubs, shower steamers and bath bombs.
-
Home Fragrance Making
Calculators and guides for scenting a room without a flame: reed diffuser ratios, how much fragrance oil a bottle takes, and what each one costs to make.
Our Calculators
All free. All accurate. Built by makers, for makers.
- candles
Candle Wax Calculator
Figure out exactly how much wax you need for any batch size.
- candles
Fragrance Load Calculator
Calculate how much fragrance oil to add for your wax type.
- candles
Candle Wick Size Calculator
Find the right wick diameter for your container and wax.
- candles
Candle Batch Size Calculator
Find out how many candles your supplies will make, or how much to buy for your next batch.
- candles
Candle Pricing Calculator
Price your candles to cover costs and turn a real profit.
- candles
Candle Burn Time Calculator
Estimate how long your candle will burn based on size and wax.
- candles
Candle Dye Calculator
Get consistent candle colors every batch, with no guesswork.
- candles
Wax Melt Fragrance Calculator
Fragrance oil for wax melts, with the higher 8–12% melt range as the default.
- candles
Essential Oil Candle Calculator
How much essential oil to add to candle wax, and why EO throw differs.
- candles
Candle Scent Calculator
Pick light, medium, or strong and get the fragrance weight for that scent strength.
- candles
Soy Wax Fragrance Calculator
Fragrance load for GB464 & soy blends, with soy cure times and add temps.
- candles
Fragrance Oil Percentage Calculator
Check the fragrance load % of an existing candle recipe by weight.
- candles
Candle Wick Spacing Calculator
Where to place multiple wicks: spacing, distance from center, and a top-down diagram.
- candles
Wax Melt Pricing Calculator
Real cost per clamshell, then wholesale, retail and profit per unit.
- home fragrance
Reed Diffuser Calculator
Fragrance oil to base ratio for any bottle size, plus cost per bottle.
- bath & body
Bath Bomb Recipe by Weight
Scale a 2:1 bath bomb recipe by weight: every ingredient, per batch and per bomb.
- bath & body
Body Butter Ratio Calculator
Whipped body butter by weight at 60:40 butters to oils, with each butter and oil worked out.
- bath & body
Lotion Bar Ratio Calculator
1:1:1 beeswax, butter and oil by weight, with a hardness check and a vegan candelilla option.
- bath & body
Shower Steamer Calculator
3:1 baking soda to citric acid by weight, with menthol and essential oil at your supplier’s usage rate.
- bath & body
Sugar & Salt Scrub Calculator
2:1 sugar or salt to oil by weight, per jar and per batch.
- incense
Incense Dipping Calculator
How much DPG and fragrance oil to mix for dipping incense sticks or cones.