IGU Thermal Calculator
Date: 21/05/2025 Time: 19:14 PM
Please select a supplier
Select
AGP
FMI
Glass Lines
Glass Providers
Glass Suppliers
Glass Team
Metro
Stake
Thermaseal
Viridian
Select
Double Glazed
Double Glazed
Triple Glazed
Outer glass
Select Product
Select
3 mm clear or tint float (fmi)
3 mm LoE-180
3 mm LoE-184
4 mm clear float (Thermaseal)
4 mm clear or tint float (AGP)
4 mm clear or tint float (fmi)
4 mm clear or tint float (Glass Lines)
4 mm clear or tint float (Glass Providers)
4 mm clear or tint float (Glass Solutions)
4 mm clear or tint float (Glass Team)
4 mm clear or tint float (Metro)
4 mm clear or tint float (Stake)
4 mm clear or tint float (Viridian)
4 mm Cool Lite SKN 176 II (Glass Lines)
4 mm Cool Lite SKN 176 II (Glass Providers)
4 mm Cool Lite SKN 176 II (Glass Team)
4 mm Cool Lite SKN 176 II (Stake)
4 mm Cool Lite SKN 183 II (Glass Providers)
4 mm Cool Lite Xtreme 70/33 II
4 mm LightBridge 1.1 (Viridian)
4 mm LoE-180
4 mm LoE-184
4 mm LoE-270
4 mm Low E Max
4 mm Low E Plus (Metro)
4 mm Low E SunX Grey (Metro)
4 mm Low E Xcel (Metro)
4 mm PerformaTech
4 mm Planitherm Ultra N II
4 mm Planitherm Ultra N II (Glass Lines)
4 mm Planitherm Ultra N II (Glass Providers)
4 mm Planitherm Ultra N II (Glass Team)
4 mm Planitherm Ultra N II (Stake)
4 mm Solux-E
4 mm Solux-Ultra
4 mm V Float Clear
4 mm V Float Grey
4mm Clear
4mm Low E Xtreme (Metro)
4mm SunX Reflect (Metro)
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float (Glass Lines)
5 mm clear or tint float (Glass Providers)
5 mm clear or tint float (Stake)
5 mm clear or tint float (Thermaseal)
5 mm Cool Lite SKN 176 II (Glass Lines)
5 mm Cool Lite SKN 176 II (Glass Providers)
5 mm Cool Lite SKN 176 II (Glass Team)
5 mm Cool Lite SKN 183 II (Glass Providers)
5 mm Cool Lite Xtreme 70/33 II
5 mm KS130 II Reflective Low E (Thermaseal)
5 mm LightBridge 1.1 (Viridian)
5 mm LoE-180
5 mm LoE-184
5 mm LoE-270
5 mm Low E Max
5 mm Low E Plus (Metro)
5 mm Low E SunX Grey (Metro)
5 mm Low E Xcel (Metro)
5 mm Low E Xtreme (Metro)
5 mm PerformaTech
5 mm Planibel AS2 Clear
5 mm Planitherm Ultra N II
5 mm Planitherm Ultra N II (Glass Lines)
5 mm Planitherm Ultra N II (Glass Providers)
5 mm Planitherm Ultra N II (Glass Team)
5 mm Planitherm Ultra N II (Stake)
5 mm Solux-E
5 mm Solux-Ultra
5 mm V Float Clear
5 mm V Float Grey
5mm Low E SunX Reflect (Metro)
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float (Stake)
6 mm clear or tint float (Thermaseal)
6 mm Cool Lite KS130 II (Glass Providers)
6 mm Cool Lite SKN 176 II
6 mm Cool Lite SKN 176 II (Glass Lines)
6 mm Cool Lite SKN 176 II (Glass Providers)
6 mm Cool Lite SKN 176 II (Glass Team)
6 mm Cool Lite SKN 176 II (Stake)
6 mm Cool Lite SKN 176 II (Thermaseal)
6 mm Cool Lite SKN 183 II (Glass Providers)
6 mm Cool Lite Xtreme 70/33 II (Glass Providers)
6 mm Evantage Super Green
6 mm LightBridge 1.1 (Viridian)
6 mm LoE-180
6 mm LoE-184
6 mm LoE-270
6 mm Low E Max
6 mm Low E Plus (Metro)
6 mm Low E SunX Grey (Metro)
6 mm Low E Xcel (Metro)
6 mm Low E Xtreme (Metro)
6 mm PerformaTech
6 mm Planitherm Ultra N II (Glass Lines)
6 mm Planitherm Ultra N II (Glass Providers)
6 mm Planitherm Ultra N II (Glass Team)
6 mm Planitherm Ultra N II (Stake)
6 mm Solux-E
6 mm Solux-Ultra
6 mm V Float Clear
6 mm V Float Grey
6mm Low E SunX Reflect (Metro)
8 mm clear float (Thermaseal)
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float (Glass Providers)
8 mm clear or tint float (Stake)
8 mm Cool Lite SKN 176 II (Glass Lines)
8 mm Cool Lite SKN 176 II (Glass Providers)
8 mm Cool Lite SKN 176 II (Glass Team)
8 mm Cool Lite SKN 176 II (Thermaseal)
8 mm Cool Lite SKN 183 II (Glass Providers)
8 mm Cool Lite Xtreme 70/33 II
8 mm LightBridge 1.1 (Viridian)
8 mm LoE-180
8 mm LoE-184
8 mm Low E Max
8 mm Low E Plus (Metro)
8 mm Low E SunX Grey (Metro)
8 mm Low E Xcel (Metro)
8 mm Low E Xtreme (Metro)
8 mm PerformaTech
8 mm Planitherm Ultra N II (Glass Lines)
8 mm Planitherm Ultra N II (Glass Providers)
8 mm Planitherm Ultra N II (Glass Team)
8 mm Solux-E
8 mm Solux-Ultra
8 mm V Float Clear
8mm Low E SunX Reflect (Metro)
10 mm clear float (Thermaseal)
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float (Glass Providers)
10 mm Cool Lite SKN 176 II (Glass Lines)
10 mm Cool Lite SKN 176 II (Glass Providers)
10 mm Cool Lite SKN 176 II (Glass Team)
10 mm Cool Lite SKN 176 II (Thermaseal)
10 mm Cool Lite SKN 183 II (Glass Providers)
10 mm Cool Lite Xtreme 70/33 II
10 mm LightBridge 1.1 (Viridian)
10 mm LoE-180
10 mm LoE-184
10 mm Low E Max
10 mm Low E Plus (Metro)
10 mm Low E SunX Grey (Metro)
10 mm Low E Xcel (Metro)
10 mm Low E Xtreme (Metro)
10 mm Planitherm Ultra N II (Glass Lines)
10 mm Planitherm Ultra N II (Glass Providers)
10 mm Planitherm Ultra N II (Glass Team)
10 mm Solux-E
10 mm Solux-Ultra
10mm Low E SunX Reflect (Metro)
12 mm LoE-184
12 mm Low E Xtreme (Metro)
K test
K test clear
Test 0.034
Test 0.053
Test 5 mm
Cavity width (enter spacer size directly)
mm
The width of the cavity between the two panels of glass. Must be between 6mm - 25mm
Middle glass
Select Product
Select
3 mm clear or tint float (fmi)
3 mm LoE-180
3 mm LoE-184
4 mm clear float (Thermaseal)
4 mm clear or tint float (AGP)
4 mm clear or tint float (fmi)
4 mm clear or tint float (Glass Lines)
4 mm clear or tint float (Glass Providers)
4 mm clear or tint float (Glass Solutions)
4 mm clear or tint float (Glass Team)
4 mm clear or tint float (Metro)
4 mm clear or tint float (Stake)
4 mm clear or tint float (Viridian)
4 mm Cool Lite SKN 176 II (Glass Lines)
4 mm Cool Lite SKN 176 II (Glass Providers)
4 mm Cool Lite SKN 176 II (Glass Team)
4 mm Cool Lite SKN 176 II (Stake)
4 mm Cool Lite SKN 183 II (Glass Providers)
4 mm Cool Lite Xtreme 70/33 II
4 mm LightBridge 1.1 (Viridian)
4 mm LoE-180
4 mm LoE-184
4 mm LoE-270
4 mm Low E Max
4 mm Low E Plus (Metro)
4 mm Low E SunX Grey (Metro)
4 mm Low E Xcel (Metro)
4 mm PerformaTech
4 mm Planitherm Ultra N II
4 mm Planitherm Ultra N II (Glass Lines)
4 mm Planitherm Ultra N II (Glass Providers)
4 mm Planitherm Ultra N II (Glass Team)
4 mm Planitherm Ultra N II (Stake)
4 mm Solux-E
4 mm Solux-Ultra
4 mm V Float Clear
4 mm V Float Grey
4mm Clear
4mm Low E Xtreme (Metro)
4mm SunX Reflect (Metro)
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float (Glass Lines)
5 mm clear or tint float (Glass Providers)
5 mm clear or tint float (Stake)
5 mm clear or tint float (Thermaseal)
5 mm Cool Lite SKN 176 II (Glass Lines)
5 mm Cool Lite SKN 176 II (Glass Providers)
5 mm Cool Lite SKN 176 II (Glass Team)
5 mm Cool Lite SKN 183 II (Glass Providers)
5 mm Cool Lite Xtreme 70/33 II
5 mm KS130 II Reflective Low E (Thermaseal)
5 mm LightBridge 1.1 (Viridian)
5 mm LoE-180
5 mm LoE-184
5 mm LoE-270
5 mm Low E Max
5 mm Low E Plus (Metro)
5 mm Low E SunX Grey (Metro)
5 mm Low E Xcel (Metro)
5 mm Low E Xtreme (Metro)
5 mm PerformaTech
5 mm Planibel AS2 Clear
5 mm Planitherm Ultra N II
5 mm Planitherm Ultra N II (Glass Lines)
5 mm Planitherm Ultra N II (Glass Providers)
5 mm Planitherm Ultra N II (Glass Team)
5 mm Planitherm Ultra N II (Stake)
5 mm Solux-E
5 mm Solux-Ultra
5 mm V Float Clear
5 mm V Float Grey
5mm Low E SunX Reflect (Metro)
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float (Stake)
6 mm clear or tint float (Thermaseal)
6 mm Cool Lite KS130 II (Glass Providers)
6 mm Cool Lite SKN 176 II
6 mm Cool Lite SKN 176 II (Glass Lines)
6 mm Cool Lite SKN 176 II (Glass Providers)
6 mm Cool Lite SKN 176 II (Glass Team)
6 mm Cool Lite SKN 176 II (Stake)
6 mm Cool Lite SKN 176 II (Thermaseal)
6 mm Cool Lite SKN 183 II (Glass Providers)
6 mm Cool Lite Xtreme 70/33 II (Glass Providers)
6 mm Evantage Super Green
6 mm LightBridge 1.1 (Viridian)
6 mm LoE-180
6 mm LoE-184
6 mm LoE-270
6 mm Low E Max
6 mm Low E Plus (Metro)
6 mm Low E SunX Grey (Metro)
6 mm Low E Xcel (Metro)
6 mm Low E Xtreme (Metro)
6 mm PerformaTech
6 mm Planitherm Ultra N II (Glass Lines)
6 mm Planitherm Ultra N II (Glass Providers)
6 mm Planitherm Ultra N II (Glass Team)
6 mm Planitherm Ultra N II (Stake)
6 mm Solux-E
6 mm Solux-Ultra
6 mm V Float Clear
6 mm V Float Grey
6mm Low E SunX Reflect (Metro)
8 mm clear float (Thermaseal)
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float (Glass Providers)
8 mm clear or tint float (Stake)
8 mm Cool Lite SKN 176 II (Glass Lines)
8 mm Cool Lite SKN 176 II (Glass Providers)
8 mm Cool Lite SKN 176 II (Glass Team)
8 mm Cool Lite SKN 176 II (Thermaseal)
8 mm Cool Lite SKN 183 II (Glass Providers)
8 mm Cool Lite Xtreme 70/33 II
8 mm LightBridge 1.1 (Viridian)
8 mm LoE-180
8 mm LoE-184
8 mm Low E Max
8 mm Low E Plus (Metro)
8 mm Low E SunX Grey (Metro)
8 mm Low E Xcel (Metro)
8 mm Low E Xtreme (Metro)
8 mm PerformaTech
8 mm Planitherm Ultra N II (Glass Lines)
8 mm Planitherm Ultra N II (Glass Providers)
8 mm Planitherm Ultra N II (Glass Team)
8 mm Solux-E
8 mm Solux-Ultra
8 mm V Float Clear
8mm Low E SunX Reflect (Metro)
10 mm clear float (Thermaseal)
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float (Glass Providers)
10 mm Cool Lite SKN 176 II (Glass Lines)
10 mm Cool Lite SKN 176 II (Glass Providers)
10 mm Cool Lite SKN 176 II (Glass Team)
10 mm Cool Lite SKN 176 II (Thermaseal)
10 mm Cool Lite SKN 183 II (Glass Providers)
10 mm Cool Lite Xtreme 70/33 II
10 mm LightBridge 1.1 (Viridian)
10 mm LoE-180
10 mm LoE-184
10 mm Low E Max
10 mm Low E Plus (Metro)
10 mm Low E SunX Grey (Metro)
10 mm Low E Xcel (Metro)
10 mm Low E Xtreme (Metro)
10 mm Planitherm Ultra N II (Glass Lines)
10 mm Planitherm Ultra N II (Glass Providers)
10 mm Planitherm Ultra N II (Glass Team)
10 mm Solux-E
10 mm Solux-Ultra
10mm Low E SunX Reflect (Metro)
12 mm LoE-184
12 mm Low E Xtreme (Metro)
K test
K test clear
Test 0.034
Test 0.053
Test 5 mm
Cavity width (enter spacer size directly)
mm
The width of the cavity between the two panels of glass. Must be between 6mm - 25mm
Change the orientation of the middle pane
Front facing = Face #3 coating on glass faces externally. Back facing = Face #4 coating on glass faces internally
Back facing - Face #4
Back facing - Face #4
Front facing - Face #3
Inner glass
Select Product
Select
3 mm clear or tint float (fmi)
3 mm LoE-180
3 mm LoE-184
4 mm clear float (Thermaseal)
4 mm clear or tint float (AGP)
4 mm clear or tint float (fmi)
4 mm clear or tint float (Glass Lines)
4 mm clear or tint float (Glass Providers)
4 mm clear or tint float (Glass Solutions)
4 mm clear or tint float (Glass Team)
4 mm clear or tint float (Metro)
4 mm clear or tint float (Stake)
4 mm clear or tint float (Viridian)
4 mm Cool Lite SKN 176 II (Glass Lines)
4 mm Cool Lite SKN 176 II (Glass Providers)
4 mm Cool Lite SKN 176 II (Glass Team)
4 mm Cool Lite SKN 176 II (Stake)
4 mm Cool Lite SKN 183 II (Glass Providers)
4 mm Cool Lite Xtreme 70/33 II
4 mm LightBridge 1.1 (Viridian)
4 mm LoE-180
4 mm LoE-184
4 mm LoE-270
4 mm Low E Max
4 mm Low E Plus (Metro)
4 mm Low E SunX Grey (Metro)
4 mm Low E Xcel (Metro)
4 mm PerformaTech
4 mm Planitherm Ultra N II
4 mm Planitherm Ultra N II (Glass Lines)
4 mm Planitherm Ultra N II (Glass Providers)
4 mm Planitherm Ultra N II (Glass Team)
4 mm Planitherm Ultra N II (Stake)
4 mm Solux-E
4 mm Solux-Ultra
4 mm V Float Clear
4 mm V Float Grey
4mm Clear
4mm Low E Xtreme (Metro)
4mm SunX Reflect (Metro)
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float
5 mm clear or tint float (Glass Lines)
5 mm clear or tint float (Glass Providers)
5 mm clear or tint float (Stake)
5 mm clear or tint float (Thermaseal)
5 mm Cool Lite SKN 176 II (Glass Lines)
5 mm Cool Lite SKN 176 II (Glass Providers)
5 mm Cool Lite SKN 176 II (Glass Team)
5 mm Cool Lite SKN 183 II (Glass Providers)
5 mm Cool Lite Xtreme 70/33 II
5 mm KS130 II Reflective Low E (Thermaseal)
5 mm LightBridge 1.1 (Viridian)
5 mm LoE-180
5 mm LoE-184
5 mm LoE-270
5 mm Low E Max
5 mm Low E Plus (Metro)
5 mm Low E SunX Grey (Metro)
5 mm Low E Xcel (Metro)
5 mm Low E Xtreme (Metro)
5 mm PerformaTech
5 mm Planibel AS2 Clear
5 mm Planitherm Ultra N II
5 mm Planitherm Ultra N II (Glass Lines)
5 mm Planitherm Ultra N II (Glass Providers)
5 mm Planitherm Ultra N II (Glass Team)
5 mm Planitherm Ultra N II (Stake)
5 mm Solux-E
5 mm Solux-Ultra
5 mm V Float Clear
5 mm V Float Grey
5mm Low E SunX Reflect (Metro)
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float
6 mm clear or tint float (Stake)
6 mm clear or tint float (Thermaseal)
6 mm Cool Lite KS130 II (Glass Providers)
6 mm Cool Lite SKN 176 II
6 mm Cool Lite SKN 176 II (Glass Lines)
6 mm Cool Lite SKN 176 II (Glass Providers)
6 mm Cool Lite SKN 176 II (Glass Team)
6 mm Cool Lite SKN 176 II (Stake)
6 mm Cool Lite SKN 176 II (Thermaseal)
6 mm Cool Lite SKN 183 II (Glass Providers)
6 mm Cool Lite Xtreme 70/33 II (Glass Providers)
6 mm Evantage Super Green
6 mm LightBridge 1.1 (Viridian)
6 mm LoE-180
6 mm LoE-184
6 mm LoE-270
6 mm Low E Max
6 mm Low E Plus (Metro)
6 mm Low E SunX Grey (Metro)
6 mm Low E Xcel (Metro)
6 mm Low E Xtreme (Metro)
6 mm PerformaTech
6 mm Planitherm Ultra N II (Glass Lines)
6 mm Planitherm Ultra N II (Glass Providers)
6 mm Planitherm Ultra N II (Glass Team)
6 mm Planitherm Ultra N II (Stake)
6 mm Solux-E
6 mm Solux-Ultra
6 mm V Float Clear
6 mm V Float Grey
6mm Low E SunX Reflect (Metro)
8 mm clear float (Thermaseal)
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float
8 mm clear or tint float (Glass Providers)
8 mm clear or tint float (Stake)
8 mm Cool Lite SKN 176 II (Glass Lines)
8 mm Cool Lite SKN 176 II (Glass Providers)
8 mm Cool Lite SKN 176 II (Glass Team)
8 mm Cool Lite SKN 176 II (Thermaseal)
8 mm Cool Lite SKN 183 II (Glass Providers)
8 mm Cool Lite Xtreme 70/33 II
8 mm LightBridge 1.1 (Viridian)
8 mm LoE-180
8 mm LoE-184
8 mm Low E Max
8 mm Low E Plus (Metro)
8 mm Low E SunX Grey (Metro)
8 mm Low E Xcel (Metro)
8 mm Low E Xtreme (Metro)
8 mm PerformaTech
8 mm Planitherm Ultra N II (Glass Lines)
8 mm Planitherm Ultra N II (Glass Providers)
8 mm Planitherm Ultra N II (Glass Team)
8 mm Solux-E
8 mm Solux-Ultra
8 mm V Float Clear
8mm Low E SunX Reflect (Metro)
10 mm clear float (Thermaseal)
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float
10 mm clear or tint float (Glass Providers)
10 mm Cool Lite SKN 176 II (Glass Lines)
10 mm Cool Lite SKN 176 II (Glass Providers)
10 mm Cool Lite SKN 176 II (Glass Team)
10 mm Cool Lite SKN 176 II (Thermaseal)
10 mm Cool Lite SKN 183 II (Glass Providers)
10 mm Cool Lite Xtreme 70/33 II
10 mm LightBridge 1.1 (Viridian)
10 mm LoE-180
10 mm LoE-184
10 mm Low E Max
10 mm Low E Plus (Metro)
10 mm Low E SunX Grey (Metro)
10 mm Low E Xcel (Metro)
10 mm Low E Xtreme (Metro)
10 mm Planitherm Ultra N II (Glass Lines)
10 mm Planitherm Ultra N II (Glass Providers)
10 mm Planitherm Ultra N II (Glass Team)
10 mm Solux-E
10 mm Solux-Ultra
10mm Low E SunX Reflect (Metro)
12 mm LoE-184
12 mm Low E Xtreme (Metro)
K test
K test clear
Test 0.034
Test 0.053
Test 5 mm
Gas fill
Argon
Glazing orientation (vertical or skylight)
Vertical
22° angle
30° angle
Skylight
Vertical
U-VALUE (Ug )
XX
W/(m².K)
Calculation of the steady state U-value of insulating glass units to EN673:2011 in compliance with NZBC Clause H1, v.5.
Version 3.0d (26 August 2022) Verified by BRANZ