Chimney Calculator
Calculate proper chimney flue size based on appliance BTU rating. Get material estimates and code compliance information.
Appliance & Chimney Details
Appliance Type:
50,000 BTU
10,000 BTU200,000 BTU
BTU
15 ft
8 ft40 ft
Chimney Type:
Flue Shape:
8 in
4 in16 in
Required Flue Area
7.1 sq in
Recommended: 4" diameter (round)
Flue Size Adequate
Your flue: 50.3 sq in | Required: 7.1 sq in
💨Theoretical Draft
0.75" WC
🔧Flue Liner Needed
17 ft
🎩Cap Size
12"
📋Height Code
Passes
Masonry Materials:
Bricks (approximate)450
Mortar Bags1
Estimated Cost:
$2,250
Based on masonry construction
Chimney Height Requirements (3-2-10 Rule)
3 Feet Minimum
Above the point where chimney passes through roof
2 Feet Higher
Than any structure within 10 feet horizontally
Draft Concerns
Taller chimneys provide better draft