Duct Planner

Free HVAC Duct Sizing Calculator

Unit System

Current Unit System: SI

Air Quantity

L/S

Friction Loss

Pa/m

0.05 - 1

Velocity

m/s

3 - 10

Dimensions

mm

100 - 1000

Air Data

Friction Mode

OR

Velocity Mode

Duct Name

Air Quantity *(L/S)

Friction Loss(Pa/M)

0.05

0.25

0.5

0.75

1

Velocity(m/s)

3

4

5

6

7

8

9

10

Duct Material

Duct Size

Round Duct Diameter(MM)

Rectangular Duct Dimensions(MM)

Width

100

300

500

700

1000

Slider disabled - width auto-calculated

Height *

200 mm

100

200

300

400

500

600

700

800

900

1000

Flow Area(m²)

Possible Sizing

Width
(MM)

×

Height
(MM)

Ratio

×

250

×

300

×

350

×

400

×

500

×

600