Accurate window measurements are essential for perfect blind fitting and optimal aesthetics. Blind size calculation ensures precise dimensions and flawless installation.
This guide covers expert formulas, detailed tables, and real-world examples for reliable blind measurement. Learn quick, accurate techniques for every window type.
Calculadora con inteligencia artificial (IA) – Blind Size Calculator: Quick & Accurate Window Measurements Guide
- Calculate blind width for an inside mount window with 80 cm width and 120 cm height.
- Determine outside mount blind dimensions for a window with 150 cm width and 130 cm height.
- Find roller blind size for a 100 cm wide and 180 cm tall window with a 5 cm recess.
- Adjust blinds for a 90 cm inside mount window with window frame protrusion of 2 cm.
Comprehensive Tables of Common Blind Sizes and Measurements
| Window Type | Measurement Type | Typical Window Width (cm) | Typical Window Height (cm) | Blind Width Calculation (cm) | Blind Height Calculation (cm) | Recommended Mount Type |
|---|---|---|---|---|---|---|
| Standard Inside Mount | Width | 60 – 120 | 80 – 150 | Window width – 1.5 | Window height | Inside Mount |
| Standard Inside Mount | Height | 60 – 120 | 80 – 150 | Window width – 1.5 | Window height | Inside Mount |
| Outside Mount | Width | 70 – 200 | 100 – 200 | Window width + 5 to 10 | Window height + 5 to 15 | Outside Mount |
| Outside Mount | Height | 70 – 200 | 100 – 200 | Window width + 5 to 10 | Window height + 5 to 15 | Outside Mount |
| Roller Blinds | Width | 50 – 150 | 80 – 200 | Window width – 2 | Window height | Inside or Outside Mount |
| Roller Blinds | Height | 50 – 150 | 80 – 200 | Window width – 2 | Window height | Inside or Outside Mount |
| Venetian Blinds | Width | 60 – 180 | 90 – 180 | Window width – 1.8 | Window height | Inside Mount |
| Venetian Blinds | Height | 60 – 180 | 90 – 180 | Window width – 1.8 | Window height | Inside Mount |
Essential Formulas for Blind Size Calculation Explained
Understanding the precise formulas used for blind size calculation is critical for accuracy. Below are the key formulas and thorough explanations of each variable.
1. Inside Mount Blind Width Calculation
Formula:
Blind Width = Window Width – (2 × Clearance Allowance)
Variables:
- Window Width: The exact horizontal measurement of the window recess, generally measured in centimeters or inches.
- Clearance Allowance: This is the small gap left on each side of the blind to ensure smooth operation and prevent scraping. Typically ranges from 0.7 to 1 cm (approx. ¼ inch).
Common Values: Clearance allowance is usually set between 1.2 cm to 2 cm total (combined both sides).
2. Inside Mount Blind Height Calculation
Formula:
Blind Height = Window Height
Note that some professionals recommend subtracting 1 cm to avoid bottom scrapes, but this depends on blind type and window casing.
3. Outside Mount Blind Width Calculation
Formula:
Blind Width = Window Width + (2 × Overlap Allowance)
Variables:
- Window Width: Width of the window frame or glass area depending on installation preference.
- Overlap Allowance: The extra width added beyond the window frame to ensure full coverage and block light effectively. Ranges from 2.5 to 5 cm per side.
Common Values: Total additions from 5 cm to 10 cm in width provide sufficient overlap.
4. Outside Mount Blind Height Calculation
Formula:
Blind Height = Window Height + (Overlap at Top + Overlap at Bottom)
Variables:
- Window Height: Measurement from top to bottom of the window frame or glass.
- Top & Bottom Overlap: Usually 2.5 to 7.5 cm added above and below the window to block light and improve coverage.
5. Roller Blind Width Adjustment
Formula:
Blind Width = Window Width – Roller Mechanism Clearance
The roller mechanism requires space inside the recess or outside mount brackets, so the blind’s fabric width is slightly smaller.
Clearance Range: Often between 1.5 to 3 cm based on the hardware used.
6. Venetian Blind Measurements
Formula:
Blind Width = Window Width – Side Clearance
Venetian blinds require clearance on both sides to allow slat movement; typically 0.9 cm per side is adequate.
Detailed Real-World Examples of Blind Size Calculations
Example 1: Inside Mount Venetian Blind for Residential Window
Scenario: A customer wants a Venetian blind installed inside the window recess. The measured window dimensions are 95 cm width and 140 cm height. The clearance allowance per side is set at 0.8 cm.
Calculation:
- Blind Width = 95 cm – (2 × 0.8 cm) = 95 cm – 1.6 cm = 93.4 cm
- Blind Height = 140 cm (assuming no height reduction)
Result: The blind should be ordered at 93.4 cm width and 140 cm height for an inside mount. This ensures a smooth fit and prevents rubbing on the sides.
Example 2: Outside Mount Roller Blind for Office Window
Scenario: An office window measures 130 cm width and 150 cm height. The client prefers outside mount to cover window trims for better light control. Overlap allowance is 4 cm on each side, top overlap is 7 cm, and bottom overlap is 5 cm.
Calculation:
- Blind Width = 130 cm + (2 × 4 cm) = 138 cm
- Blind Height = 150 cm + 7 cm + 5 cm = 162 cm
Result: Order the roller blind at 138 cm width and 162 cm height to ensure full coverage and no gaps around edges.
Additional Considerations and Tips for Accurate Blind Measurement
When measuring, always use a steel tape for precision. Record measurements at three points (top, middle, bottom for width; left, center, right for height) to identify any inconsistencies. Use the smallest measurement for inside mount blinds to guarantee fit. Account for window hardware, protrusions, and any obstructions that may affect installation and operation.
When ordering blinds online or from suppliers, confirm if the dimensions you provide correspond to fabric size, finished blind size, or mounting brackets specifications. Clarify these distinctions for precise orders and avoid costly mistakes.