MEP Engineering Toolkit
Professional Tools
🏗️ Project Information
View and edit project details, notes, and calculator outputs.
Diffuser Sizing
Size diffusers based on CFM and type.
📏 Duct Sizing
Calculate duct dimensions for airflow requirements.
Diffuser Sizing (Space Constrained)
Linear diffusers for limited ceiling space applications.
🚿 Water Supply Sizing
Calculate pipe sizes based on fixture units.
🌧️ Storm Sizing
Calculate storm drain pipe sizes for roof areas.
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🤖 AI Duct Design Soon
Upload floor plan for AI-powered duct routing and sizing.
➕ More Tools Soon
Additional calculators and features on the way.
Project Information
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Project Details
Calculator Outputs
Main Water Line
—
Water Meter Size
—
Hot Water Line
—
Cold Water Line
—
Total WSFU
—
Storm Drains
—
AC Units Size
Coming Soon
Total Electrical Load
Coming Soon
Energy Score
Coming Soon
Water Heater Size
Coming Soon
Envelope Values
Coming Soon
Notes
Select Diffuser Type
Linear
Slot Diffusers
Rectangular
Traditional Grilles
Linear Diffuser Calculator
Supply (Ceiling)
AS
Return
JS
Supply (Sidewall)
JS
Transfer
JS
Required Diffuser Length
-
-
Rectangular Diffuser Calculator
Supply
Air Supply
Return
Air Return
Transfer
Air Transfer
Recommended Diffuser Size
-
-
Duct Sizing Calculator
Supply
0.08 in/100ft
Return
0.05 in/100ft
Recommended Duct Size
-
-
⚠ 4:1 Aspect Ratio Rule
The selected size exceeds the 4:1 width-to-height ratio. It is recommended to use:
Select Diffuser Type
Linear
Slot Diffusers
Rectangular
Traditional Grilles
Space Constrained Linear Diffuser
Supply (Ceiling)
AS
Return
JS
Supply (Sidewall)
JS
Transfer
JS
Required Diffuser Length
-
-
Space Constrained Rectangular Diffuser
Supply
Air Supply
Return
Air Return
Transfer
Air Transfer
Recommended Diffuser Size
-
-
Water Supply Sizing Calculator
30 to 39 psi
Recommended
40 to 49 psi
50 to 60 psi
Over 60 psi
Fixture
Cold / Hot / Total
Quantity
Shower
1 / 1 / 1.4
0
Bathtub
1 / 1 / 1.4
0
Lavatory
0.5 / 0.5 / 0.7
0
Water Closet (Flush Tank)
2.2 / 0 / 2.2
0
Water Closet (Flushometer)
6 / 0 / 6
0
Bidet
1.5 / 1.5 / 2
0
Urinal (Flush Tank)
3 / 0 / 3
0
Sink
1 / 1 / 1.4
0
Pot Filler
1 / 0 / 1
0
Washing Machine
1 / 1 / 1.4
0
Dishwasher
0 / 1.4 / 1.4
0
Freezer/Refrigerator
0.25 / 0 / 0.25
0
Ice Maker
0.25 / 0 / 0.25
0
Hose Bibb
2 / 0 / 2
0
Steam
0.5 / 0 / 0.5
0
Other (Custom)
0 /
0 /
0
0
Water Supply Fixture Units & Pipe Sizes
WSFU Totals
GPM
Cold Water:
-
Hot Water:
-
Total:
-
Pipe Sizes
Meter & Service:
-
Distribution (Total):
-
Distribution (Cold):
-
Distribution (Hot):
-
Recirculation:
-
Configuration:
/
ft Developed Length
30-39 psi
Storm Sizing Calculator
Drain #Drain
Roof Area (sf)Roof
Wall L × H (ft)Wall
Parapet L × H (ft)Parapet
SlopeSlope
GPMGPM
VerticalVert
HorizontalHoriz
×
×
-
-
-
1/8"
×
×
-
-
-
1/8"
×
×
-
-
-
1/8"
×
×
-
-
-
1/8"
×
×
-
-
-
1/8"
Combine Drains
Select drains to combine for combined pipe sizingSuggest a Tool
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