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HVAC duct sizing calculator

Any two of duct size (round or rectangular), airflow, velocity and friction rate. Round and rectangular equivalents, nearest standard sizes, friction loss per 100 ft (Darcy-Weisbach, Colebrook), velocity pressure, design checks. Equal-friction sizing, fixed-depth ducts, IP or SI. Shows every step with the numbers. $0.002 USDC per call.

Ready now2 calls · 2 buyers in 30 days

Input

Airflow: CFM (IP) or L/s (SI).
Round duct diameter: in (IP) or mm (SI).
Friction loss: in. w.g. per 100 ft (IP, typically 0.05-0.15) or Pa/m (SI, typically 0.4-1.2). With airflow, this is equal-friction sizing.
Rectangular height: in or mm.
"IP" (°F, CFM, in, BTU) or "SI" (°C, L/s, mm, kW). Default IP. Applies to inputs and results.
Air velocity: FPM (IP) or m/s (SI).
Rectangular width: in or mm. With height, the duct size; alone, a fixed side (e.g. a ceiling depth) the other side is solved for.

Sample response

Published by the provider. Your run returns a fresh response.

response18 keys
airflow1000
checks3 keys
aspect_rationull
friction"Typical design range (0.04-0.15 in. w.g./100 ft; about 0.3-1.2 Pa/m)."
velocity"Normal design range (400-2,500 FPM; about 2-12.7 m/s)."
friction_factor0.01885
friction_rate0.08
inputs_used2 keys
airflow1000
friction_rate0.08
next_calls1 item
notes3 items
0"The rectangular size has the same friction loss and airflow as the round duct (ASHRAE equivalent diameter); its velocity is lower because its area is larger."
1"Galvanized steel (ε = 0.0003 ft) and standard air (0.075 lb/ft³, 70 °F, sea level). Fittings and transitions are not included."
2"For design guidance; the engineer of record is responsible for final selections."
primary_shape"round"
rectangular9 keys
area1.184
aspect_ratio1
basis"equal_friction"
equivalent_diameter14.27
friction_rate0.08
height13.06
velocity845
width13.06
references2 items
0"ASHRAE Handbook—Fundamentals (2021), Ch. 21 Duct Design"
1"SMACNA HVAC Duct Design Manual (standard sizes, aspect ratio guidance)"
reynolds_number114361
round5 keys
area1.1112
diameter14.27
friction_rate0.08
velocity900
solved_for"size"
steps3 items
unit_labels17 keys
airflow"CFM"
area"ft²"
condensate"gal / h"
density"lb / ft³"
elevation"ft"
enthalpy"BTU / lb dry air"
friction_rate"in. w.g. / 100 ft"
grains"gr / lb dry air"
humidity_ratio"lb water / lb dry air"
length"in"
load"MBH (1,000 BTU/h)"
pressure"psia"
relative_humidity"%"
specific_volume"ft³ / lb dry air"
temperature"°F"
velocity"FPM"
velocity_pressure"in. w.g."
units"IP"
velocity900
velocity_pressure0.0505
responseobject, 18 keys
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Track record

Paid calls, last 30 days
2
Buyers, last 30 days
2
Last paid call

Reported by the x402 directory.

A$0.0029 per call