🛁 Bath Bomb Calculator
Create perfectly fizzy bath bombs with balanced recipes
Batch Settings
Total Batch: 420.0 g (6 bath bombs × 70.0 g each)
Recipe Ratios
Baking Soda50%
Citric Acid25%
Cornstarch15%
Oils/Butters5%
Fillers (clay, salts)5%
Total100%
Fizz Quality:Balanced
Good fizz with moderate duration
Baking Soda:Citric Acid ratio = 2.0:1
Additives
📋 Your Recipe
| Ingredient | Amount | Cost |
|---|---|---|
| Baking Soda | 210.0 g | $2.31 |
| Citric Acid | 105.0 g | $1.16 |
| Cornstarch | 63.0 g | $0.28 |
| Oils/Butters | 21.0 g | $0.23 |
| Fillers | 21.0 g | $0.23 |
| Fragrance Oil | 8.4 g | $0.09 |
| Polysorbate 80 | 8.4 g | $0.15 |
| Colorant | 0.5 tsp | ~$0.10 |
| Witch Hazel | Spray as needed |
📝 Instructions
- 1Combine all dry ingredients (baking soda, citric acid, cornstarch, fillers) in a large mixing bowl
- 2In a small container, mix your oils, fragrance oil, polysorbate 80 (if using), and colorant
- 3SLOWLY drizzle the wet mixture into the dry while whisking constantly to avoid premature fizzing
- 4Lightly spray witch hazel and mix until the mixture holds together when squeezed (like wet sand)
- 5Firmly pack the mixture into molds, pressing both halves together for spherical molds
- 6Let dry undisturbed for 24-48 hours in a low-humidity environment
- 7Gently remove from molds and store in airtight containers
⏰ Shelf Life
- • Properly stored: 6-12 months
- • Storage: Airtight container, cool dry place
- • Avoid: Humidity, direct sunlight, heat
- • Signs of aging: Weaker fizz, faded color, scent loss
⚠️ Safety Notes
- • Citric acid can irritate eyes - wear safety glasses when mixing
- • Use only skin-safe fragrance oils and cosmetic-grade colorants
- • SLSA is a fine powder - consider wearing a dust mask
- • Test on small skin area before use if you have sensitivities
- • Keep away from children and pets during production
💡 Pro Tips
- • Work quickly - humidity activates the fizz reaction
- • Too crumbly? Add more oil or witch hazel
- • Bombs cracking? Let them dry longer before unmolding
- • Want stronger scent? Max 3% fragrance is safe for bath bombs
- • Polysorbate 80 prevents bathtub oil rings
- • Add dried flowers on top before drying (press in gently)