Choosing the right rug size is less about mathematics and more about proportion.
Most people underestimate how large a rug should be. The instinct is usually to go smaller. It is almost always the wrong decision.
In a living room, start by measuring the full seating area, not just the empty floor in the centre. The rug should visually anchor the furniture together. Ideally, all pieces sit on it comfortably, or at minimum the front legs do.
A rug floating alone in the middle of the room tends to make even beautiful spaces feel temporary.
For dining rooms, practicality matters just as much as aesthetics. Measure the table, then add at least 60 centimetres on every side. This allows chairs to remain on the rug when pulled out, rather than catching awkwardly on the edges.
Bedrooms follow a different logic.
One of the most balanced layouts is placing the rug partially under the bed, leaving enough visible around the sides and foot to frame the room naturally. Small rugs beside the bed rarely create the same impact as one properly grounding the entire space.
Hallways and runners are where spacing becomes important.
A runner should never touch the walls directly. Leaving a border of visible flooring — usually around 20 to 30 centimetres — creates breathing room and makes the proportions feel deliberate.
The gap matters.
If you are between two sizes, choose the larger one.
A rug that is slightly generous usually looks luxurious. A rug that is slightly too small immediately looks like a compromise.