Ductwork Calculator & Material Planner
Equivalent round duct diameter from airflow and target velocity, plus takeoff.
Project estimate
Ductwork Planner
$1,110–$1,277
Material estimate + optional reserve · USD
- Equivalent round trunk diameter
- 17.73 in
- Average branch airflow
- 150 CFM
- Working time allowance
- 1.19 days
19 person-hours / 2 people / 8 h per day. Provisional activity rates; adjust in advanced options.
Excludes labor, tax, delivery, equipment rental, permits and site work. Sample prices are not live retailer quotes. Upper budget includes 15% contingency.
Cost breakdown
- Duct
- $690
- Fittings
- $360
- Sealing
- $60
Shopping list
0 / 5 checkedWhole packages rounded up. Edit a unit price to use your supplier's quote.
Duct
Trunk duct (5 ft)
9 sections
$360$40 per sections
Branch duct (25 ft)
6 lengths
$330$55 per lengths
Fittings
Supply registers / boots
8 sets
$200$25 per sets
Takeoffs / balancing dampers
8 sets
$160$20 per sets
Sealing
Duct sealing materials
2 kits
$60$30 per kits
Save this project
Saved on this browser only. No account required.
Assumptions & project notes
- Material allowance: 10%. Package sizes and coverage rates are editable in the inputs.
- Velocity-based equivalent diameter is not a duct design. Friction, fittings, available static pressure, returns and room loads require a full calculation.
- Check final dimensions, product specifications and any required local approvals before ordering.
Tools & preparation
- Tape measure, straightedge and level
- Marking and layout tools
- Suitable cutting and fastening tools
- Product-specific preparation and finishing tools
A preparation list; confirm installation tools with your selected products.
How to use the ductwork planner
Start with designed total airflow, chosen trunk air velocity, branches, length, average branch route. The result includes equivalent round trunk diameter, average branch airflow. Open advanced options to match your product sizes, material allowance and labor expectations.
1. Measure and specify
Measure each room or surface and identify openings, edges, fixtures and transitions.
2. Adjust the estimate
Check package coverage, material orientation, pattern alignment and substrate requirements.
3. Prepare your order
Review full-piece cuts and matching accessories; order from consistent product batches where needed.
4. Plan the work
Prepare the surface and follow the product installation and finishing sequence, including drying or curing periods.
Frequently asked questions
What does the ductwork planner estimate?+
Equivalent round duct diameter from airflow and target velocity, plus takeoff. The shopping list includes trunk duct (5 ft), branch duct (25 ft), supply registers / boots, takeoffs / balancing dampers, duct sealing materials.
Which assumptions should I check?+
Velocity-based equivalent diameter is not a duct design. Friction, fittings, available static pressure, returns and room loads require a full calculation.
Are the prices current supplier quotes?+
No. Initial unit prices are illustrative USD budgeting inputs. Enter a price beside each material to use your own quote. The total includes materials only; labor, shipping, taxes, permits and rental are excluded.
Can I save or share my project?+
Save stores the inputs and prices on this browser. Share link includes the configuration in the address so another device can reopen it. Download CSV exports the shopping list, and Print / PDF opens your browser’s print dialog.