Fondant Calculator
Calculate exactly how much fondant you need to cover any cake
Fondant Required
Per Tier
3340g
118 oz
Total Needed
3340g
7.4 lbs
Roll Out Size
21"
diameter/width
Surface Area
177
sq inches
Homemade Marshmallow Fondant Recipe
For 3340g fondant:
Marshmallows
2004g
7 bags (10oz)
Powdered Sugar
3006g
25 cups
Water
134ml
9 tbsp
Fondant Tips
- Apply a thin layer of buttercream before fondant for best results
- Knead fondant until pliable before rolling
- Use cornstarch or powdered sugar to prevent sticking
- Roll fondant to 1/4 inch thickness for best coverage
- Smooth from center outward using fondant smoothers
- Store unused fondant in airtight container at room temperature
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.