01
Measure your window
Enter the width and height of the window area you are dressing.
Free Curtain Size Calculator: Find the Right Length and Width
Stop guessing curtain measurements. Enter your window size, hanging style, and fullness preference to get the right curtain rod width, panel width, curtain length, and panel count. Free, instant, and no signup required.
Your Curtain Size Calculator
Your Result
Enter your window measurements
Fill in the fields to calculate your recommended curtain rod width, panel width, curtain length, and panel count.
You have the measurements. But will the curtains actually look right in the room?
The right curtain size is only part of the decision. A curtain can be technically correct and still feel wrong if the color, fabric weight, rod height, or length does not work with the rest of the room.
Upload a photo of your space and use DesignSense AI to visualize a refreshed room direction before you buy. See how your window treatment choice fits with your wall color, furniture, lighting, and overall design style.
See It in My Room Free1 free render — use it on any tool * No credit card needed * Instant result
Why curtain sizing is harder than it looks.
Most people measure only the window and buy the closest curtain size they can find. That is why so many curtains end up looking too narrow, too short, or awkwardly placed.
The issue is that curtains are not supposed to match the window exactly. They need extra width for fullness, extra rod length to frame the window, and the right hanging height to make the room feel taller and more polished.
A curtain that is too small can make a beautiful room feel unfinished. A curtain that is sized correctly can make the same window look larger, softer, and more intentional.
This curtain size calculator helps you estimate the right rod width, panel width, curtain length, and panel count before you buy.
Simple measurements. A more polished window.
02
Choose your curtain style
Select your rod extension, curtain length style, fullness level, and number of panels.
03
Get your curtain size recommendation
Instantly see the recommended rod width, total curtain width, panel width, curtain length, and panel count so you can shop with more confidence.
Avoid curtains that look too narrow
Curtains need more fabric than the exact window width. Without enough fullness, panels look flat and stretched instead of soft and intentional.
This calculator helps you estimate the right curtain width based on your window and preferred fullness level.
Living room curtains
Dining room curtains
Bedroom curtains
Kitchen curtains
Office curtains
Get the right curtain length before you buy
Sill-length, apron-length, floor-length, and puddled curtains all create different effects. The calculator helps you choose a length that fits your design goal, whether you want a clean everyday look or a more dramatic designer finish.
Make the whole room feel more finished
Curtains affect more than the window. They change how tall the walls feel, how soft the room looks, and how the colors connect with furniture and decor.
Once you have the right size, use DesignSense AI to visualize the full room direction before committing to fabric, color, or hardware.
Render My Room Free with DesignSense
1 free render - use it on any tool * No credit card needed * Instant result
DesignSense AI Everything You Need to Visualize Your Home Decor
The curtain size calculator is just the start. Here's what else can help you plan the room:
Rug Size Calculator
Find the right rug dimensions for living rooms, bedrooms, and dining spaces
Tile Calculator
Calculate tile quantity, coverage, and installation costs
Paint Calculator
Estimate paint quantity, wall coverage, and project costs
Interior Designers
Visualize room transformations and redesign concepts instantly
Homeowners
Plan renovations with photorealistic AI home redesign concepts
Contractor & Trades
Help clients visualize renovations before project approval
Common questions, answered
Curtains usually need to be wider than the window so they can hang with natural folds. A common starting point is 1.5x to 2x the window width, depending on how full you want the curtains to look.
For a more polished look, curtain rods are often placed above the window frame rather than directly on top of it. Hanging the rod higher can make the room feel taller and the window feel larger.
Floor-length curtains usually look the most intentional for living rooms, bedrooms, and dining rooms. They can lightly touch the floor, hover just above it, or puddle slightly depending on the style you want.
Most standard windows use two curtain panels, one on each side. Wider windows, sliding doors, or large picture windows may need four panels or custom-width drapery for enough fullness.
Curtain fullness refers to how much extra fabric is used compared to the window width. More fullness creates deeper folds and a softer, more expensive look. Less fullness creates a flatter, simpler look.
Curtains are large visual surfaces. Their color, length, and fabric weight can change how the whole room feels. An AI room render helps you preview the overall design direction before spending money on curtains, rods, paint, or matching decor.
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