Glass Needed
2.48 lbs
Per Piece
8.3 oz
Cost
$7
Pieces
4
As an Amazon Associate, we earn from qualifying purchases.
Inputs
Result
Each tumbler uses ~13 oz of soda-lime glass. 4 × 13 oz = 52 oz × 1.20 buffer = 62.4 oz = 3.9 lbs × $3/lb.
Inputs
Result
Each ornament uses ~6 oz of boro glass. 6 × 6 oz = 36 oz × 1.25 = 45 oz = 2.81 lbs × $8/lb.
A standard blown glass tumbler uses about 12–16 oz of soda-lime glass. Larger pieces like vases use 24–40 oz. Always budget 15–25% extra for cullet, drops, and practice gathers.
Soda-lime glass is the most common and affordable choice for furnace glassblowing. Borosilicate (boro) is used for scientific glass and flamework, and lead crystal produces brilliant optical clarity.
| Glass | Cost/lb | Working Temp | Best For |
|---|---|---|---|
| Soda-Lime | $3 | 2,000°F | General blown glass |
| Borosilicate | $8 | 2,200°F | Scientific, flamework |
| Lead Crystal | $12 | 1,800°F | Fine stemware, optics |
Beginners should budget 30–50% waste (2–3 attempts per finished piece). Experienced glassblowers typically see 10–20% waste from cullet, color testing, and imperfect pieces.
Material cost alone is $1–5 per piece for soda-lime glass. Adding studio time ($15–30/hr), propane/gas, and color, a single piece costs $20–60 all-in for a hobbyist in a shared studio.
Read our guide
Read our guide
Read our guide
Explore glassblowing, kiln scheduling, fusing, and stained glass calculators.
Last Updated: Mar 19, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.