Choosing a Blackout Curtain: Light-Blocking and Thermal Insulation

By the Joybuy Product Recommendation OfficerLast Updated: 07-19-2026

Are you waking up too early from the morning sun? Bothered by streetlights shining into your bedroom, or do you want to keep the heat out in the summer and in during the winter? A good blackout curtain is often the most direct solution. But with so many choices in materials, hanging systems, and sizes, finding the right one can be a challenge.

This article is intended as a practical guide. We're skipping the marketing jargon and focusing on the specifications that truly matter. We'll help you choose a blackout curtain that fits your home and your needs, whether you're a light sleeper, a remote worker, or simply looking for more privacy and comfort.

What to Consider Before You Buy?

Before we look at the recommendations, here are a few practical points to help you make your choice.

1. The Hanging System: Pencil Pleat or Eyelets?

The way you hang a curtain determines its look and functionality. The two most common systems for a ready-made curtain are:

• Curtain with pencil pleat tape: This is a traditional and versatile choice. A pencil pleat tape is a strip of fabric at the top of the curtain where you can insert hooks. This type of curtain is suitable for both a curtain track and a rod (with rings). It gives you the freedom to create the pleats yourself.
• Curtain with eyelets: This type of curtain has large, metal rings (also called grommets) integrated into the fabric. You slide the rod directly through the rings. This creates a modern look with wide, even pleats, and the curtain glides open and closed smoothly. Installation is typically very simple.

2. Material and Density for Insulation

The effectiveness of a blackout curtain depends heavily on the material. Most blackout fabrics use a special multi-layered weaving technique. Pay attention to the weight of the fabric, often expressed in grams per square meter (gsm). A heavier fabric, such as 230 gsm, is generally thicker and not only blocks more light but also functions as a thermal insulating curtain.

This thermal property helps keep the room temperature stable, which can contribute to a lower energy bill. Additionally, a thicker fabric often has a noise-reducing curtain effect, dampening sound from outside.

3. The Right Dimensions for Optimal Blackout

A ready-made curtain is only effective if it's the right size. Measure the width of your window frame or curtain track and multiply this by 1.5 to 2.5. This ensures a beautiful drape and prevents light from seeping in at the sides. For large windows or sliding doors, an extra-wide blackout curtain is an excellent solution to cover the entire surface seamlessly. Measure the length from the track or rod to the desired height (e.g., the windowsill or the floor).

Our Top Product Recommendations

Based on product specifications and functionality, we have listed a few popular choices for you.

1. PONY DANCE Extra-Wide Blackout Curtain with Pencil Pleat – Light Beige

• Why it stands out: With a width of 300 cm, this curtain is ideal for large living room windows. The light color creates a calm atmosphere while still blocking a significant amount of light. The pencil pleat tape makes it suitable for almost any hanging system.
• Pros:
  • Material: Heavy polyester fabric of 230 gsm.
  • Light Blocking: Blocks 60-75% of light.
  • Functionality: Works as a thermal insulating curtain and is slightly noise-reducing.
  • Installation: Universal pencil pleat tape for tracks and rods.
• Who is it for? Ideal for a living room blackout curtain where complete darkness isn't necessary, but privacy and ambiance are important. Perfect for those looking for a light, neutral color that complements many interiors.

2. PONY DANCE Extra-Wide Blackout Curtain with Pencil Pleat – Cappuccino

• Why it stands out: This curtain offers the same extra-wide dimension and versatile pencil pleat tape as the light beige version, but with a higher degree of blackout thanks to the darker cappuccino color.
• Pros:
  • Material: Dense fabric of 230 gsm.
  • Light Blocking: Blocks 75-85% of light.
  • Functionality: Good thermal and sound-insulating properties.
  • Installation: Flexible thanks to the pencil pleat tape.
• Who is it for? An excellent choice for a bedroom blackout curtain or a home cinema. It offers more blackout than the lighter version, which is ideal for light sleepers or for reducing glare on screens.

3. PONY DANCE Blackout Curtains with Eyelets (Set of 2) – Black

• Why it stands out: This set offers the highest level of blackout in this selection. The black color and triple-weave technology make this a true light-blocking curtain. Installation is very easy thanks to the curtain with eyelets. An added benefit is that the fabric is partly made from recycled materials and is OEKO-TEX certified.
• Pros:
  • Material: Polyester (≥50% recycled) with triple-weave technology.
  • Light Blocking: Blocks 85-95% of light.
  • Functionality: Very effective as a thermal insulating and noise-reducing curtain.
  • Installation: Easy to slide onto a rod thanks to the 8 eyelets per panel.
• Who is it for? The ultimate choice for shift workers, light sleepers, or anyone who wants to make a room as dark as possible. Ideal for the bedroom. Also a great option for those who value products made with recycled materials.

Haven't Found What You're Looking For?

The right color or size can be very personal. If these recommendations don't quite match what you need, or if you're specifically looking for a noise-reducing curtain in a dark shade, there are more options available.

? Check out our full collection of Black Noise-Proof Curtains for more options.

Frequently Asked Questions

What's the difference between a dimout and a blackout curtain?

Although the terms are often used interchangeably, there is a slight difference. A dimout curtain blocks a large portion of light, usually between 70% and 95%. A blackout curtain is designed to block almost 100% of light. For most bedrooms, a good dimout curtain is sufficient.

Do blackout curtains really help against the cold?

Yes, a thermal insulating curtain can definitely help. The thick, dense fabric creates an extra barrier in front of the window. In the winter, this helps to keep the heat in, and in the summer, it keeps the sun's heat out. This can contribute to a more comfortable indoor climate and a lower energy bill.

How wide should a blackout curtain be?

For good coverage and a beautiful drape, a simple rule of thumb is to measure the width of your window or track and multiply that number by 1.5 to 2.5. For an extra-wide blackout curtain of 300 cm, for example, this is suitable for a window approximately 120 to 200 cm wide. This ensures the curtain also provides a good seal at the sides.