Superfat app icon

From oils to a cured bar.

Superfat is a soap calculator for iPhone and iPad that shows the math behind every lye number, walks you through soap day step by step, and keeps a batch log until each bar is ready.A soap calculator for iPhone and iPad that shows the math behind every lye number, walks you through soap day, and logs each batch until it's ready.

Download on the App StoreComing soon
Free · Pro $9.99 once
Batch log: Lavender Oat Bar, cure 28 days, 19 days left
Make mode, step 3 of 9: weigh 140.5 g of NaOH
Recipe Lavender Oat Bar: olive, coconut and shea, NaOH 140.5 g with Show the math
Step 1 · The recipe

Every lye number shows its math.

Each oil keeps its color from the recipe to the batch. Tap Show the math to see every multiplication and the published source of each oil's SAP value.Every multiplication and the published source of each oil's SAP value.

Olive 500.0 g × 0.1355 = 67.73 g NaOHSAP 190 · Codex Alimentarius CXS 33-1981
Step 2 · The lye

NaOH, KOH or dual lye, with purity.

Bar, liquid or cream soap. Set the KOH share and the purity on your container, and the grams follow.Set the KOH share and the purity on your container.

39.42 g pure ÷ 90% = 43.8 g KOH
Step 3 · Soap day

Read it through goggles.

Make mode shows one step and one number at a time, large enough to read from across the counter. Tap when you've weighed it.One step and one number at a time.

Lye causes severe burns. Wear goggles and gloves, add lye to water, never water to lye, and keep children and pets out of the room.

Step 4 · Scent

Fragrance checked against your certificate.

Enter the category limit from your supplier's certificate. Superfat checks it in the finished, cured bar and turns red when you go over.Checked in the finished, cured bar.

Your bar: 3.2% of finished soapMax in Category 9 (soap) · 4.2%
Step 5 · The cure

A countdown, then a reminder.

Each batch gets a lot number, notes and a photo. Superfat counts down the cure and tells you the day it's ready.Superfat tells you the day a batch is ready.

Cure 28 days19 days left
Also

Also: aA small candle calculator.

Wax and fragrance per jar, from the jar's water capacity and your wax's density.

8 oz water × 0.9 = 7.20 oz wax
7.20 oz × 8% = 0.58 oz fragrance
$9.99
once, for Pro. The calculator is free.

Pro adds unlimited recipes, the batch log with cure reminders, printed recipe sheets, mold resize, your own oils, the fragrance limits library, citric acid adjustment, iCloud sync and backups.

No accountNo adsNo subscriptionRecipes stay on your device