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How To

Home Math: Ratio, Proportions & Budgets To Know About

In the intricate world of interior design, success hinges on more than just a keen eye for aesthetics. A profound understanding of ratios, proportions, and budgets forms the backbone of any well-executed design project.


Whether you're a seasoned professional or an aspiring designer, mastering these principles is essential for creating interiors that are both beautiful and practical. In this guide, we'll delve into the critical ratios, proportional guidelines, and budgeting strategies that every designer (and interior lover) should know to navigate their projects with confidence and precision.

The Power of Ratios

There’s no denying that ratios are the unsung hero when it comes to interior design. Most notably, the golden ratio. Appearing in art, nature and architecture, the golden ratio — or the number 1.618 — is all about finding balance and proportion, mirroring the Fibonacci sequence that’s been used across the globe for thousands of years. In short, it follows the 40:60 formula, which involves dividing space into two parts to create visual appeal. 


A seamless way to incorporate this magical ratio is by introducing patterns into your home. Aim for your chosen pattern to occupy at least 60% of the room, such as wallpaper and sofas, with the remaining 40% left plain — think subtle cushions and textured rugs. If patterns aren’t your cup of tea, apply the golden ratio to other aspects of your house, like planning layouts and hanging paintings.

Take the colour from the walls and spread it with decor items to even the balance.

Use a pattern, such as stripes, as part of the 60% for an eclectic style.

Choose a two-tone colour palette to simplify the 60-40 rule.

Budgeting Made Easy

Starting from scratch? Whether you’re redecorating a single room or renovating your entire home, having a clear budget in mind is essential for staying on track. In either case, an effective strategy to consider is the 30-20-40-10 principle. This involves dividing your funds into percentages so you can prioritise your spending, achieve your vision and focus on the job at hand.

Start by delegating your total budget to different categories, then assign your chosen percentage — it’s really that simple. A popular formula amongst interior designers is to allocate 30% of your finances to furniture, 20% to decor, 40% to renovation materials, and 10% to professional services. With this thoughtfully curated plan, you can achieve a unique interior that reflects your individual style and personality.

Odd vs. Even

The odd vs. even debate has divided designers for decades. Some favour symmetry, while others prefer the playful charm that odd numbers bring. But ultimately the decision is yours. 


Arranging items in odd numbers creates a dynamic aesthetic that’s both intriguing and eye-catching. As well as integrating movement and rhythm, spaces feel organic, drawing inspiration from the irregularities found in nature. On the other hand, an even amount of ornaments, placed on a windowsill, table or mantelpiece, offers a sense of calmness. Too much uniformity, however, can lead to rooms feeling static and monotonous. Our advice? Embrace a mix of odd and even to find perfect harmony in your home.

Pillow placement is the most versitaile way to play with even placements.

Creating a symmetrical living space gives a room harmony.

One bed, two bedside tables, four pictures and five pillows, creating a triangle.

The Rule of Thirds

Borrowed from the world of photography, the rule of thirds offers a straightforward yet powerful framework for crafting a captivating space. Put simply, it helps to place elements in a way that guides your gaze. By dividing the room into a grid of nine equal-sized squares and placing focal points at the intersections of these lines, you can create an engaging composition. 


When put into action, this rule can help finding the perfect spots for your art or trinkets. Try placing your accessories off-centre to add movement and energy, or push the boundaries of tradition with a gallery wall.

Furniture placement balances the flow of thirds.

Create three distinct areas with decor placement.

Shelves provide a natural area for a grid, creating an eye-catching guide.

Precision in Placement

Decorating your home doesn’t have to mean breaking the bank. Sometimes, all you need is a trusty measuring tape. According to design experts, furniture should be placed approximately 36 inches away from walls to maximise space and flow, while leaving 42 inches between chairs allows room for a side table, providing a sense of functionality and refined appeal.


In addition to furniture placement, the spacing of wall decor can instantly elevate your home’s ambiance. A great rule to follow is leaving eight inches between your sofa and wall hanging. By making small adjustments here and there, your interior will feel more balanced in no time.

Colour Coordination

Choosing the right colours for your home isn’t easy. Enter the 60-30-10 rule. This foolproof rule dictates the placement of colours in a room: 60% dominant, 30% secondary, and 10% accent. Each colour plays an important role in setting the tone, effortlessly blending depth, personality and flair. But the versatility of the 60-30-10 rule doesn't stop there — it can be extended to other design elements, such as textures, fabrics and lighting, to form a welcoming space that both you and your guests will love.

Mix cool tones with warmer textures.

Add an accent piece as your 10%.

Use textures to balance the dominant colour.

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