Calculate wax
and fragrance.

Plan your batch, weigh your ingredients, and keep the recipes you want to make again.

Try the calculator

US$9.99 · One app purchase. All features included.

A saved Lavender recipe with the Use recipe button to start another batch.
Cera on iPhone: 24 candles at 180 grams each, with 8% fragrance by wax weight, need 4,000 grams of wax and 320 grams of fragrance.

Wax weight
or total weight?

Switch the percentage basis to see how the wax and fragrance amounts change. The total batch weight stays the same.

What each option means
24 candles at 180 g each
Fragrance: 8%
Wax4,000 g
Fragrance320 g

Total weight 4,320 g

Save your
recipes.

Make a different batch size

Open a saved recipe and choose how many candles to make. Your fill weight and fragrance percentage are already there.

Keep a backup

Export your recipes to a file and save it outside Cera. Import it whenever you need to restore them.

Use the wax you have

Enter your remaining wax to find how many whole candles your formula can make, how much fragrance to weigh, and how much wax will be left.

Keep your place at the scale

Mark wax and fragrance as you weigh them. Share a batch sheet with the quantities, formula, and saved materials.

Try a new technique

Explore ten candle projects, from soy jars to hand-dipped tapers, with materials, steps, difficulty, and original sources.

Questions?

Is there a subscription?

No. Cera is a US$9.99 app purchase with all features included. Save as many recipes as you like. There are no subscriptions or in-app upgrades.

What fragrance percentage should I use?

Use the percentage in your tested formula, following your suppliers' guidance. Cera calculates the amounts from the percentage you enter.

What weight should I enter?

The combined wax and fragrance weight for one candle, without the container. A jar's capacity in fluid ounces or milliliters isn't its fill weight in ounces or grams.

Can I use grams and ounces?

Yes. Cera converts the weight when you switch units. Ounces are measured by weight, not volume.

Does it work offline?

Yes. You can calculate batches and use your recipes without an internet connection or an account.

Where are my recipes saved?

On your iPhone. Before deleting the app, export a backup and save it outside Cera's folder to keep your recipes. Privacy policy.