The Block CalculatorWhat is a glass block window?
Glass block windows are made from thick glass blocks mortared together like masonry. They let in daylight while blurring the view, so they are popular in bathrooms, basements, stairwells and entryways. They are also sturdy and secure, and insulate better than single-pane glass.
Pros & cons
✓ Advantages
- Privacy & light: they blur the view but let daylight through
- Security: much harder to break than a normal window pane
- Energy efficiency: many blocks have a partial-vacuum core
✕ Disadvantages
- No ventilation: fixed panels can’t open unless you add vent inserts
- Weight: need solid framing or a masonry opening
- Style: the look doesn’t suit every design
How does this calculator work?
The glass block window cost calculator divides the window area by the face area of one block and rounds up. It multiplies the count by your price per block, then adds the optional mortar and labor costs.
Formula used
Window Area = Width × Height
Block Area = Block Width × Block Height
Blocks Required = CEILING(Window Area ÷ Block Area)
Material Cost = Blocks Required × Cost per Block
Total Cost = Material Cost + Mortar Cost + Labor CostExample
Scenario: A window 72″ wide × 42″ high using 8″ × 8″ glass blocks at $6.00 each, with $25 of mortar and $112 of labor.
Window area: 72 × 42 = 3,024 sq in
Block area: 8 × 8 = 64 sq in
Blocks: 3,024 ÷ 64 = 47.25, rounded up to 48
Final result: 48 × $6 = $288 in materials. Add mortar and labor for a total of $425.
Prices here are examples only. Glass block prices vary by size, pattern and supplier.
Frequently asked questions
What size are standard glass blocks?
Common nominal sizes are 6″ × 6″, 8″ × 8″ and 12″ × 12″, usually 3″–4″ thick. Nominal size includes a ¼″ joint.
Can I install a glass block window myself?
Pre-assembled panels and mortarless kits make DIY possible for small openings. Larger or load-bearing openings are best left to a professional.
Last updated: . Results are estimates — see our disclaimer.