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Precision Fit Engineering
Window Blind Size & Recess Fit Calculator
Determine the exact order width and drop for Inside vs. Outside recess window blinds. Automatically calculates 3-point wall taper variance, factory clearance deductions, casing depth validation, and stack-back height.
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Visualise Your Blind Before You Order
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Full Zebra Blinds CatalogBlind Position
Day (Open)Wall Colour
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Presets or tap wheel for all colours
100+ fabrics, spec tables, pricing & installation guide in the free interactive ebook.
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Window Blind Size & Fit Calculator
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Roller Blinds Most Popular
Clean minimalist roll-up fabric. Rolls around a top barrel with side chain control.
Min. 6.5 cm depth
Wooden Venetian Blinds Classic Luxury
Horizontal tilting wood slats. Stacks into a solid block at the top when pulled up.
Min. 7.5 cm depth
Zebra / Day-Night BlindsModern Living
Alternating sheer and solid fabric stripes for instant daylight and privacy control.
Min. 7 cm depth
Roman Blinds Soft Furnishing
Soft drapery luxury blinds that pleat into deep cascading fabric folds when raised.
Min. 5.5 cm depth
Vertical Louver BlindsPatio & Wide
100mm vertical vanes rotating 180 degrees. Perfect for patio sliding glass doors.
Min. 8 cm depth
Monsoon PVC Outdoor BlindsGoa Weatherproof
Heavy 0.5mm clear PVC with stainless steel wind guide cables for rain protection.
Min. 10 cm depth
Visual Comparison: Where the Blind FitsTap to expand diagram ↗
🔎 Inside mount sits within the window casing. Outside mount extends past the window frame onto the wall.
cm
Width inside the framecm
Top of casing to window sillWalls not perfectly straight?
Required: 6.5 cm
Sufficient for flush inside mounting
Inside Mount Specification
Recess SizeExact Order Dimensions
Manufacture Order Size (Width × Drop)
119.0 × 150.0 cm
Includes factory safety clearance (-10mm width)Measured Window Width:120.0 cm
Factory Width Deduction:-10 mm
Measured Window Height:150.0 cm
Actual Fabric Width:115.8 cm (-32mm bracket)
Stack-Back Height (Raised):~12.0 cm (~8%)
Send Size to Hitech for Instant QuoteGet custom fabric swatches & laser measurement in Goa (+91 9579542260)
Visual Fit Clearance
Roller Blinds Cassette
Inside Flush (-10mm)
Window Sill
Window: 120.0 × 150.0 cm
Order: 119.0 × 150.0 cm
Recommended Order Size
119.0 × 150.0 cm
Installation Architecture
Inside Mount vs. Outside Mount: How to Choose
Mounting position determines how much light enters your room, whether the blind sits inside the window sill, and if your window frame has enough casing depth. Review the visual comparison below:
🔎 Inside Mount: sits within window frame. Outside Mount: extends over window frame.
Inside Recess (Recess Size)
The blind fits neatly inside the window casing. Ideal for clean architectural lines and modern interiors where window sills are kept clear for decor.
Minimalist Look: Keeps window recess tidy and flush with plaster.
Sill Clearance: Leaves your bottom window sill free for plants or books.
Depth Constraint: Requires at least 6.5 cm to 7.5 cm flat depth. Handles may obstruct.
Gap:Small light glow (~16mm) around fabric edges on roller blinds.
Formula: Narrowest Width - 10 mm factory deduction
Outside Recess (Exact / Face Mount)
The blind mounts to the wall or architrave above the window opening, overlapping the wall on all 4 sides. Ideal for shallow windows and blackout bedrooms.
Superior Light Block: Overlapping fabric eliminates perimeter light bleed.
Works on Any Window: Zero recess depth needed; bypasses cranks and handles.
Makes Windows Look Bigger: Creates illusion of higher ceilings and wider spans.
Note:Headrail projects forward from the flat wall by approx. 7 cm.
Formula: Width + 10 cm overlap | Height + 15 cm overlap
The 3-Point Measurement Rule for Window Blinds
Window casings in Indian apartments and villas are rarely 100% square. Plaster thickness and settlement cause frame widths to vary by 5 mm to 20 mm across the height.
1
Top Width
Measure tight inside the top where the metal bracket headrail will screw into the lintel or ceiling.
2
Middle Width
Measure midway down the frame. Walls often bow inward near window handles or locking latches.
3
Bottom Width
Measure just above the window sill where the bottom weighted rail will rest when fully lowered.
The Golden Rule of Inside Blinds: Always order based on the narrowest of the 3 widths. If you order based on the widest measurement, your blind will scrape and jam against the narrower section of your wall.
Factory Clearance Deductions Across Blind Types
Different blind mechanisms require specific operating clearances. When ordering "Recess Size", our factory applies the following precision engineering tolerances:
| Blind Type | Min. Depth | Width Deduction | Stack Height % | Key Mechanism Note |
|---|---|---|---|---|
| Roller Blinds | 6.5 cm | -10 mm total | ~8% (~8cm roll) | Fabric is ~32mm narrower than top bracket cassette. |
| Wooden Venetian (50mm) | 7.5 cm | -10 mm total | ~18% - 22% | Basswood slats stack thick when raised; keep drop clear. |
| Zebra / Day-Night Blinds | 7.0 cm | -10 mm total | ~10% (~9cm cassette) | Enclosed curved cassette protects double-layer sheer bands. |
| Roman Fabric Blinds | 5.0 cm | -10 mm total | ~20% - 25% | Fabric folds stack accordion-style at the top when pulled up. |
| Vertical Louver Blinds | 8.0 cm | -10 mm total | Stack to Side (~15%) | Requires 127mm or 89mm slat rotation depth inside casing. |
| Monsoon PVC Blinds | 8.0 cm | -15 mm total | ~10% | Clear 0.5mm PVC with stainless steel wind guide cables. |
Product Catalog & Architecture
Real Window Blind Types & Mechanism Showcase
Compare mechanisms, casing depth clearances, and real installed aesthetics across all 6 window blind designs:
Most Popular
Roller Blinds
Rolls around a slim top barrel. Minimum 6.5 cm flat depth needed. Raised stack is extremely compact (~8cm).
Best for: Bedrooms, offices, kitchens
Classic Luxury
Wooden Venetian Blinds
50mm basswood or faux wood slats tilting 180 degrees. Requires 7.5 cm flat recess depth. Stack is ~18% of drop.
Best for: Living rooms, executive studies, villas
Modern Living
Zebra / Day-Night Blinds
Dual-layer striped fabric for instant transition between sheer daylight and total privacy. Needs 7.0 cm depth.
Best for: Living rooms, modern master bedrooms
Soft Furnishing
Roman Fabric Blinds
Soft curtain fabric gathered into horizontal cascading folds. Works in shallow 5.5 cm recesses. Stack is ~25%.
Best for: Bedrooms, dining halls, heritage villas
Patio & Wide Spans
Vertical Louver Blinds
100mm fabric vanes rotating 180 degrees. Slides sideways along a track, ideal for patio sliding glass doors. Needs 8.0 cm depth.
Best for: Patio sliding doors, floor-to-ceiling windows
Goa Weatherproof
Monsoon PVC Blinds
Heavy 0.5mm clear Japanese PVC with 316 stainless steel wind cables. Mounted outside recess to seal verandas from rain.
Best for: Balconies, verandas, restaurant patios
Goa On-Site Measurement Guarantee
Not Confident Measuring Tricky Windows?
Windows with cranks, tiles, sliding glass tracks, or deep cornices can be tricky. Our Goa team visits with laser measuring tools and full fabric swatch decks to take complete responsibility for your fit.
Blind Sizing FAQs
Frequently Asked Questions About Measuring Window Blinds
What is the difference between inside and outside recess measurement for blinds?
Inside Recess (Recess Size) means the blind hangs entirely inside the window frame casing, sitting flush with your wall for a sleek, contemporary appearance. Outside Recess (Exact / Face Mount) means the blind is mounted onto the wall or architrave above the window, overlapping the opening on all sides to eliminate light gaps and clear window handles.
Why do I need to measure 3 points across the window width?
Walls, window frames, and plastering in residential homes are almost never perfectly square. Measuring at the top, middle, and bottom reveals if the frame tapers inwards. For an Inside Recess mount, you must always use the NARROWEST width so the blind mechanism does not jam against the wall when operating.
Should I make deductions before ordering inside recess blinds?
No! Never deduct millimeters yourself. Always provide the exact, tight wall-to-wall measurements. Custom blind manufacturers automatically deduct 10 mm (approx. 5 mm on each side) to provide smooth operating clearance. If you deduct first and the factory deducts again, your blind will have unsightly gaps.
What is the minimum window depth required to fit blinds inside the recess?
Minimum casing depth depends on the blind mechanism: Roller Blinds require at least 6.5 cm, Wooden Venetian (50mm slats) require 7.5 cm, Zebra / Day & Night blinds require 7.0 cm, and Roman Blinds need at least 5.0 cm. If your window frame is shallower than these numbers or has protruding handles, choose an Outside Recess mount.
Why is the fabric narrower than the total width on roller blinds?
On roller blinds, the top metal mounting brackets, side chain mechanism, and idler pin occupy approximately 32 mm (1.25 inches) of total width. The actual fabric roll will be roughly 16 mm narrower on each side than your bracket-to-bracket order size. For zero side light gaps in bedrooms, choose outside mount or cassette side channels.
Does Hitech Home Decor provide blind measuring and installation in Goa?
Yes! Hitech Home Decor offers professional on-site laser measurement, fabric swatch consultation, and certified installation across Goa including Panjim, Porvorim, Assagao, Candolim, Calangute, Margao, and Vasco. We also ship custom-made blinds with complete DIY installation hardware Pan-India.