What Is the Rule of Thirds? How to Use It in Interior Design

Arranging a room, styling a shelf, or positioning furniture can be a challenge when trying to create a balanced look. Often, a room feels “off,” but pinpointing the issue can be tricky. The rule of thirds is a helpful technique to establish visual harmony and balance in your home.

What Does the Rule of Thirds Mean?

The rule of thirds is a popular design principle often used in interior design. “The rule of thirds divides the space into a symmetrical grid, guiding proportions and spacing,” explains Lindye Gallow of Lindye Galloway Studio. This technique involves dividing a space horizontally and vertically into three equal parts—left, center, and right—creating a balanced composition. The goal is to lead the eye naturally across the room without making it feel cluttered.

Unlike strict guidelines, the rule of thirds is more of a flexible approach to maintaining proportion and balance. “It allows you to create visual stability without forcing symmetry,” adds designer Elle Cantrell of Elle Du Monde.

How to Use the Rule of Thirds: Step-by-Step

To apply the rule of thirds, imagine the space as a grid of three columns and three rows, forming nine sections. This structure helps you assess the balance between upper, middle, and lower thirds as well as between the left, right, and center areas.

“While it’s commonly used for room layouts, the rule of thirds also works well for smaller spaces like mantelpieces, built-in shelves, or bookshelves,” says Galloway. Cantrell advises checking the grid sections for overall balance by observing the colors, textures, and shapes within each square, ensuring that visual weight is evenly distributed across the space.

Practical Tips for Using the Rule of Thirds

For beginners, start small. Galloway recommends testing the rule of thirds on surfaces like side tables or shelves to get a feel for arranging items in a balanced way. “This helps you practice before moving on to larger items, like furniture or artwork,” she suggests. Cantrell also notes that the rule of thirds is useful when arranging throw pillows on a sofa or styling a bed.

A useful tip: odd numbers are often more visually appealing. The rule of thirds is sometimes confused with the “rule of three,” which involves grouping items in sets of three. Both rules can be combined to create an appealing design. “Feel free to experiment with different shapes, textures, and heights to add interest while keeping the space balanced,” says Galloway.

One final piece of advice concerns rug placement. “The right rug and its position can transform a room,” Galloway notes. For instance, if the coffee table is centrally placed, position a rug directly underneath, arranging other furniture around it to maintain symmetry. If you choose a smaller rug, it should ideally cover one-third of the area, allowing other elements in the room to shine.

Final Thoughts: Bringing Balance to Your Home with the Rule of Thirds

The rule of thirds is an accessible, powerful tool for achieving visual harmony in any room. Whether arranging furniture, placing decor, or positioning rugs, this technique allows you to create a balanced, inviting space that feels just right.