SlushiCalc
iOS App · Home Entertaining

Know if your slushie
will actually freeze.

SlushiCalc uses real cocktail science — the PAC method — to instantly predict whether your recipe will freeze correctly. Build your mix, watch the gauge, and get it right every time.

Coming Soon on the App Store See Features
3:37
SlushiCalc
oz cups mL
-2.5°
FREEZE
-2.5°C
freezing point
SUGAR
10.9°Bx
A bit low
ALCOHOL
5.1%
Ideal ✓
Perfect Slushie 🧪 38 oz
Ingredients Clear All
Rosé Wine
12% 3°Bx
−
16 oz
+
Watermelon Juice
8°Bx
−
16 oz
+
Simple Syrup
50°Bx
−
4 oz
+
🌡
Calculator
⭐
Recipes
🔖
My Recipes
🔬
Science
Features

Stop wasting batches on mixes that won't freeze

SlushiCalc uses the PAC method — the same physics used by professional bartenders and commercial frozen drink machines — to predict whether your recipe will freeze before you pour a single drop.

SlushiCalc
-2.5°
FREEZE
-2.5°C
freezing point
SUGAR
10.9°Bx
A bit low
ALCOHOL
5.1%
Ideal ✓
Perfect Slushie
Great recipe — this mix will freeze perfectly
-2.5°C
A Bit Low
Add simple syrup to boost sugar
-1.8°C
Won't Freeze
Too much alcohol — reduce spirits
-0.5°C
Freeze Point Calculator

Real science behind every prediction

SlushiCalc uses the PAC (Parts of Anti-freeze Concentration) method to calculate the exact freezing point of your mix. The same physics used by professional bartenders and commercial frozen drink machines worldwide.

  • ✓ Live status — updates instantly as you adjust
  • ✓ Colour-coded gauge: green, amber, red
  • ✓ Plain-English advice — tells you exactly what to adjust
  • ✓ Freeze temperature readout in °C
  • ✓ Sugar (°Brix) and alcohol % shown separately
Cancel · Add Ingredient
🍹 All
🥃 Spirits
🍸 Liqueurs
🍷 Wine & Beer
Vodka
40% ABV
+
White Rum
40% ABV
+
Tequila
40% ABV
+
Gin
40% ABV
+
Bourbon
40% ABV
+
🔍 Search ingredients
Smart Ingredient Library

50+ ingredients, ready to add in one tap

SlushiCalc comes with a comprehensive library of ingredients pre-loaded with accurate alcohol and sugar data. Browse by category or search to find what you need instantly.

  • ✓ Spirits: Vodka, Rum, Tequila, Gin, Bourbon & more
  • ✓ Liqueurs: Triple Sec, Peach Schnapps, Blue Curaçao
  • ✓ Wine & Beer: Rosé, White Wine, Prosecco, Aperol
  • ✓ Juices: Watermelon, OJ, Pineapple, Mango, Passion Fruit
  • ✓ Sodas, syrups, and mixers included
‹ Add Ingredient
Add Custom Ingredient
Name
My Fruit Punch
Serving size (mL)
240
Sugar per serving (g)
28
Calculated °Brix
11.7°Bx
Contains alcohol
Add Ingredient
Custom Ingredients

Can't find it? Add it yourself

SlushiCalc can calculate °Brix from any nutrition label. Just enter the serving size in mL and grams of sugar per serving — the app handles the conversion automatically. No chemistry degree required.

  • ✓ Works with any packaged drink or juice
  • ✓ Enter serving size and sugar content
  • ✓ °Brix calculated automatically
  • ✓ Supports alcoholic and non-alcoholic custom ingredients
  • ✓ Saved for reuse in future recipes
Recipes
🍉
Watermelon Frosé
Perfect Slushie
· 5.1% ABV
Makes ~32 oz. Double everything f...
↑ Load into Calculator
🍋
Classic Margarita Slush
Perfect Slushie
· 7.3% ABV
Makes ~32 oz. Add a salted rim an...
↑ Load into Calculator
🥥
Pineapple Coconut Slush
Perfect Slushie
· 7.5% ABV
Tropical and creamy...
Built-in Recipes

Six starter recipes, tested to perfection

Each built-in recipe has been calibrated to sit in the perfect freeze zone. Load any recipe into the calculator in one tap, then customise it to taste — swap ingredients, adjust quantities, and save your own version.

  • ✓ 🍉 Watermelon Frosé — rosé + watermelon
  • ✓ 🍋 Classic Margarita Slush — tequila, lime, triple sec
  • ✓ 🥥 Pineapple Coconut Slush — rum + pineapple
  • ✓ 💙 Blue Raspberry Lemonade — non-alcoholic option
  • ✓ 🍊 Aperol Spritz Slush & 🍓 Strawberry Daiquiri
My Recipes
🍹
My Watermelon Frosé
Saved · 38 oz · 4 ingredients
Perfect Slushie
5.1% ABV
↑ Load into Calculator
🍋
Summer Party Margarita
Saved · 48 oz · 5 ingredients
Perfect Slushie
6.8% ABV
↑ Load into Calculator
🫐
Blueberry Lemonade Slush
Saved · 32 oz · Non-alcoholic
Perfect Slushie
Non-alcoholic
Save Your Own Recipes

Build it once. Make it forever.

When you've dialled in a recipe you love, save it to your personal library. Pull it up any time and reload it into the calculator in one tap — ready to scale, tweak, or make exactly as-is.

  • ✓ Save any recipe with a name you choose
  • ✓ All ingredients, quantities, and units saved
  • ✓ Load back into the calculator in one tap
  • ✓ Works for both alcoholic and non-alcoholic recipes
  • ✓ Stored locally on your device, no account needed
Everything Included

The complete slushie toolkit.

🧊

Freeze Point Calculator

Real PAC science calculates your mix's freezing point instantly as you build your recipe.

📊

Live Status Gauge

Colour-coded feedback — green, amber, red — updates in real time with plain-English advice.

📚

50+ Ingredients

Spirits, liqueurs, wines, juices, sodas, syrups, and mixers — all pre-loaded with accurate data.

✏️

Custom Ingredients

Enter serving size and sugar grams from any nutrition label. SlushiCalc calculates °Brix for you.

📐

Real-World Units

oz (½ oz steps), cups (¼ cup steps), and mL (5 mL steps) — snapping to actual measurements.

⚠️

Volume Warnings

Automatic alerts if your batch is too small to circulate or too large for your machine's drum.

📖

Six Starter Recipes

Curated recipes, each tested in the freeze zone. One tap to load and customise in the calculator.

💾

Save Your Recipes

Save any recipe to your personal library and reload it into the calculator any time, in one tap.

📱

Native iOS

Built in Swift for iPhone. Fast, native, and designed around the home slushie experience.

Coming Soon

Get every slushie right, every time

SlushiCalc is currently in development and will be available on the App Store soon. Built for anyone with a home slushie machine who wants their mix to actually freeze.

Coming Soon on the App Store
Support & Questions

Get in touch about SlushiCalc

Have a question, found a bug, or want to suggest a feature? We read every message and aim to respond within one business day.