Vertical Blind Vane Quantity Calculator

Calculate the number of vertical blind vanes from track width, louver size, carrier spacing, stack side, pack rounding, and practical spare allowance.

🎯Real Room Presets

📏Vane Quantity Inputs

Unit system

Sizing method

Use replacement mode when the track and carrier stems are already installed.

Measurement basis

Outside mounts usually extend beyond the opening for better edge coverage.

Opening or track width (in)

Side adjustment total (in)

For inside mount this subtracts clearance; for outside mount it adds extension.

Existing carrier count

Count the plastic stems or carrier clips across the installed track.

Vane width

Custom vane width (in)

Carrier pitch allowance

Pitch is the distance from one carrier stem to the next.

Custom pitch if needed (in)

Stack side

Spare vanes

Pack rounding

Vane material

Vane Quantity Results

Required Vanes

coverage count

Order Quantity

after spares and pack rounding

Finished Span

0 in

track coverage width

Estimated Stack

0 in

open blind stack allowance

🧱Vane Material Comparison

Rigid

Vinyl

Common for doors and moisture-prone rooms.

Soft

Fabric

Gentler light diffusion with more flex.

Stiff

Faux Wood

Heavier feel and stable rotation.

Slim

Aluminum

Thin profile for compact stacks.

Glare

Solar Screen

Keeps outward view with reduced glare.

Curve

S-Curve PVC

Curved profile closes tighter than flat vanes.

Hide

Textured

Texture masks fingerprints and light scuffs.

Dark

Blackout

Fabric-backed choice for bedrooms.

📊Vane Width and Pitch Reference

Nominal vane	Metric size	Typical carrier pitch	Used for
2.5 in mini vane	63 mm	2.25 in / 57 mm	Narrow windows, small recesses
3.5 in standard vane	89 mm	3.25 in / 83 mm	Bedroom windows and most patio doors
3.94 in metric vane	100 mm	3.63 in / 92 mm	Metric replacement sets
5 in wide vane	127 mm	4.63 in / 118 mm	Wide doors and broader view-through spacing

📐Coverage Width by Vane Count

Vane count	3.5 in coverage	5 in coverage	Metric note
12 vanes	39 in / 99 cm	55.5 in / 141 cm	Small opening
18 vanes	58.5 in / 149 cm	83.3 in / 212 cm	Bedroom window
24 vanes	78 in / 198 cm	111 in / 282 cm	Patio door
30 vanes	97.5 in / 248 cm	138.8 in / 353 cm	Wide slider
36 vanes	117 in / 297 cm	166.5 in / 423 cm	Large track

📦Pack Rounding Reference

Pack option	Use when	Example required	Rounded order
Individual vanes	One-for-one replacement	21 vanes	21 vanes
5-vane pack	Small repairs	21 vanes	25 vanes
8-vane pack	Common replacement bundles	21 vanes	24 vanes
10-vane pack	Whole-window ordering	21 vanes	30 vanes
12-vane pack	Large tracks and doors	31 vanes	36 vanes

🏠Common Opening Examples

Opening or track	Typical vane	Estimated vanes	Stack allowance
36 in sidelight	2.5 in mini	16 vanes	5.6 in
48 in office window	3.5 in standard	15 vanes	8.0 in
72 in patio door	3.5 in standard	23 vanes	11.9 in
96 in sliding door	3.5 in standard	30 vanes	15.8 in
120 in wide slider	5 in wide	26 vanes	17.0 in

Replacement check: when the headrail already has carriers, the most accurate vane quantity is the carrier count plus any spare vanes. Match the hanger hole style before mixing old and new vanes.

Coverage check: measure the track or intended finished span, not just the glass. Outside mounts often need extra width so the closed vanes cover side light gaps.

Vertical blinds are often thought to be a simple product to purchase. However, many peoples will incorrectly calculate the vane count that they will need if they dont take the proper measurement of the opening in which they will install these blinds. In order to correctly calculate the number of vanes needed for an installation site, there is several variable that need to be accounted for in the calculation.

The first variable to account for is the finished span of the track. This is the width of the track or the closed position of the vanes. These will be installed inside of an opening to allow for the vanes to slide into place.

How to Work Out How Many Vanes You Need

In this case, the finished span will be slightly less than the opening width to allow for the vanes to fully slide into the opening. In the case of installing the blinds outside of the opening, the finished span will be increased to ensure the coverage of the gaps in the blinds. Using a calculator to determine the number of vanes needed when the finished span of the track is accounted for will prevent any guesswork in determining the number of vanes or the number of inches that is needed for the installation.

Another variable to consider is the carrier pitch. The carrier pitch is the distance between one carrier stem to the next. The standard measurement of the carrier pitch include the over lap of the blinds to provide privacy.

However, a

Vertical Blind Vane Quantity Calculator