How to Measure your Window for Curtain Poles

Choosing the right curtain pole size is one of the most important steps when dressing your windows. The correct measurements ensure your curtains hang beautifully, allow maximum natural light into your home, and create a balanced, professional finish.

This complete guide explains how to measure for curtain poles, including width, height, diameter, and installation tips — helping you choose the perfect setup for any room.

How to Measure for Curtain Poles (Quick Answer)

To measure for a curtain pole, follow these steps:

1. Measure the full width of your window
2. Add 15–30cm on each side for curtain stacking
3. Choose a pole that is 30–60cm wider than your window
4. Install the pole 10–15cm above the window frame

This ensures your curtains hang neatly and allow maximum light into the room.

Why Getting Curtain Pole Measurements Right Matters

A correctly sized curtain pole will:

• Allow curtains to fully clear the window
• Let in maximum natural light
• Make windows appear larger and more elegant
• Ensure curtains hang and move smoothly

Incorrect measurements can lead to:

• Curtains blocking the window
• Poles sagging under weight
• Poor overall appearance

What Size Curtain Pole Do I Need?

The size of curtain pole you need depends on your window width. As a general rule, add 30–60cm to the total window width to allow space for curtains to stack neatly at the sides.

Step 1: Measure Your Window Width

Start by measuring the full width of your window.

You can measure:

• Inside the recess
• Across the full window frame (recommended)

Expert Tip: Always measure the full width of the window, not just the glass.

This ensures your curtains properly frame the window.

Step 2: Add Extra Length for Curtain Stack

To allow curtains to sit neatly when open, your curtain pole must extend beyond the window.

How much wider should a curtain pole be than the window?

Expert Tip: A curtain pole should be 15–30cm wider on each side of the window, meaning 30–60cm wider overall. This allows curtains to fully clear the window when open and maximises natural light.

This means:

• Total pole length = window width + 30–60cm

Example:

• Window width: 150cm
• Ideal pole length: 180–210cm

Curtain Pole Size Guide (UK Measurements)

Step 3: Choose the Right Curtain Pole Diameter

Curtain pole thickness should match the weight of your curtains.

• 19mm poles → lightweight curtains
• 28mm poles → standard curtains
• 35mm+ poles → heavy or lined curtains

Expert Tip: Using the correct diameter prevents sagging and improves curtain movement.

Explore our full range of curtain poles to find the right size.

Step 4: Measure Curtain Pole Height

Curtain pole height affects how your room looks.

Recommended height:

• 10–15cm above the window frame
• Or higher for a more dramatic, modern look

Benefits:

• Makes ceilings appear higher
• Creates a more premium finish
• Improves curtain drape

Step 5: Measure Projection from the Wall

Curtains need space to hang freely.

Recommended projection:

• 7–10cm for standard curtains
• 10–15cm for thick or layered curtains

Measuring for Bay Window Curtain Poles

Bay windows require more precise measurements.

Steps:

• Measure each section individually
• Note angles and corners
• Choose a flexible or custom solution

Browse our bay window measuring guide for expert guidance.

Choosing Between Fixed and Extendable Curtain Poles

Extendable curtain poles

Best for:

• Flexible sizing
• Easy installation
• Standard windows

Fixed curtain poles

Best for:

• Heavy curtains
• Extra-wide windows
• Maximum strength

View our range of extendable curtain poles for flexible solutions.

Curtain Type and Its Impact on Measurements

Your curtain style affects how much space you need.

• Eyelet curtains → require more stacking space
• Pencil pleat curtains → more flexible
• Heavy curtains → require thicker poles

Complete your setup with the right curtain holdbacks.

Common Curtain Pole Measuring Mistakes

Avoid these common issues:

• Curtain pole too short
• Not allowing stacking space
• Incorrect diameter
• Too few brackets

Expert Tip: Learn more in our guide to common curtain pole mistakes.

Curtain Pole Measuring Tips Before You Buy

Before purchasing:

• Double-check measurements
• Add extra width for stacking
• Choose correct diameter
• Ensure proper bracket support

Taking time to measure properly ensures a perfect finish.

Shop Curtain Poles and Accessories

Looking for the perfect fit?

Browse our full range of:

• Wooden curtain poles
• Metal curtain poles
• Curtain tracks
• Extendable curtain poles
• Bay window curtain poles

At Curtain Pole Store, we provide high-quality solutions for every window.