Glazing sealant Calculator: measuring notes and method
Measure the filled joint
Use the filled joint dimensions rather than the entire frame recess. A large unfilled cavity behind the bead should not be counted as sealant.
Keep product selection separate
The cartridge count does not establish structural glazing suitability, adhesion or compatibility. Use the specified joint detail and product yield, and list backing materials separately.
Formula
Sealant volume = joint length × width × depth × (1 + waste ÷ 100). Cartridges = volume ÷ cartridge volume, rounded up.
Worked examples in metric and imperial units
Illustrative values match Reset example and stay fixed when you edit the calculator. Both columns describe the same calculation; converted inputs are rounded.
Metric worked example
- Joint length
- 20 m
- Joint width
- 10 mm
- Joint depth
- 6 mm
- Cartridge volume
- 0.3 L
- Waste allowance
- 10 %
Cartridges to buy: 5
Imperial worked example
- Joint length
- 65.6168 ft
- Joint width
- 0.3937 in
- Joint depth
- 0.2362 in
- Cartridge volume
- 0.0106 ft³
- Waste allowance
- 10 %
Cartridges to buy: 5
Follow the calculation
Lengths in this working are in metres.
- Filled volume with allowance = 20 × 0.01 × 0.006 × 1.1 = 1.32 L.
- Cartridge volume = 0.3 L. Divide required litres by cartridge litres and round up.
Unit conversions
1 m³ = 1,000 L ≈ 1.30795 yd³. One cubic yard is 27 ft³.
Reviewed 19 October 2026. How calculations are checked · Report a correction