How to Measure Windows Properly for Blinds or Curtains

When it comes to installing blinds or curtains, precision is what matters. The right measurements ensure your window coverings fit perfectly, look stylish, and function the way they should. Urban Lifestyle can help with home styling and layouts, including precise window measurements. But for homeowners who want to learn how to do it themselves, our blog post will walk you through the essentials of measuring windows.

Why Accurate Window Measurements Matter

Even the most beautiful blinds or curtains will look awkward if they don’t fit properly. Too short, and they leave gaps; too long, and they drag unnecessarily. Incorrect widths can cause light leakage, poor insulation, or a cluttered appearance. Accurate measurements save you from costly mistakes, unnecessary returns, and wasted time.

Tools You’ll Need Before Measuring

Before you start, gather these essentials:

A steel measuring tape (avoid cloth or flexible tapes for accuracy)
A pencil and notepad (to record measurements)
A step stool or ladder (for tall windows)
A friend or family member to assist you (optional, but helpful for larger windows)

Pro tip: Always measure in millimeters or inches and round to the nearest 1/8 inch to keep things precise.

Deciding Between Inside Mount and Outside Mount

Your mounting choice affects how you measure:

Inside Mount: Blinds are installed within the window frame for a sleek, built-in look. This style requires precise measurements, as even small miscalculations can leave gaps. It is the most common setup for blinds.
Outside Mount: Blinds or curtains are installed outside the frame, covering the entire window and sometimes extending beyond it. This option is easier to install, more forgiving with measurements, and can make windows appear larger. It is the standard setup for curtains, which are almost always installed this way.

Choose your mount type before measuring, as the process differs slightly.

Step-by-Step Guide to Measuring for Blinds

Before you start, remember to always measure in millimeters or inches and round to the nearest 1/8 inch.

For Inside Mount Blinds:

Width: Measure the inside width of the window at the top, middle, and bottom. Record the smallest measurement.
Height: Measure the inside height from the top to the sill at the left, center, and right. Record the longest measurement.
Depth: Measure the window frame’s depth to ensure it can accommodate the blind.

For Outside Mount Blinds:

Width: Measure the width of the area you want the blinds to cover. Add at least 2–3 inches on each side for better light control.
Height: Measure from the top of the desired mounting spot down to where you want the blinds to end.

Step-by-Step Guide to Measuring for Curtains

Rod Placement: Decide where you want the curtain rod to sit—usually 4–6 inches above the window frame to make the room look taller.
Width: Measure the width of the window, then multiply by 1.5 to 3 depending on how full you want your curtains to appear.
Length: Measure from the rod placement down to your desired curtain length, whether it’s sill-length, floor-length, or puddling slightly on the ground.

Common Measuring Mistakes to Avoid

Guessing instead of measuring: Even if two windows look the same, always measure each one individually.
Using the wrong tools: Cloth measuring tapes can stretch and distort accuracy. Use a steel measuring tape instead.
Not double-checking: Always measure twice to confirm your numbers.
Forgetting allowances: Curtain rods and mounting brackets need additional space. Be sure to add a few extra inches to your measurements to ensure a proper fit. Share your measurements with Urban Lifestyle, and we’ll help you account for all necessary allowances.

Quick Summary Before Ordering Your Blinds or Curtains

Accurate window measurements are the foundation of a flawless fit. Gather the right tools, decide on your mount style, and follow step-by-step measuring techniques for both blinds and curtains. Avoid common pitfalls by double-checking your numbers, and you’ll save yourself stress, time, and money. Remember that you’ll also need to add a few inches of allowance to your measurements to account for curtain bars and mounting brackets.

Are You Looking for the Perfect Blinds, Shades, or Curtains?

From modern furniture to elegant wallpapers and stylish window coverings, Urban Lifestyle has everything to make your home both functional and beautiful.

Urban Lifestyle offers free installation in Cagayan De Oro with every purchase. Check out our wide assortment of window coverings here .

For inquiries and orders you may visit or contact us:

Address: Urban Lifestyle, Kauswagan National Highway, Cagayan De Oro City, 9000 Misamis Oriental, Philippines

Contact No. : +63 917 707 5050

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