Explainer

What is a3D room planner?

A 3D room planner lets you lay out and furnish a room on screen, in three dimensions, so you can see exactly how it will look and fit before you spend a cent.

Try one for free How to design a room in 3D

The short answer

A 3D room planner takes a flat floor plan and turns it into a room you can see in three dimensions. You set your real measurements, drop in furniture, and look at the result from any angle, the same way you would walk around the real space.

Behind the scenes it uses 3D rendering to draw the room. The point is simple: you get to see the design before it is real, so you do not have to imagine it or risk it.

Why it matters

You stop guessing

A tape measure tells you a sofa is 84 inches wide. It does not tell you whether it will crowd the walkway, fight with the window, or make the rug look tiny. So people buy, hope, and end up returning the thing that did not fit.

A 3D room planner answers the question before you buy. You see the sofa in the room, to scale, next to everything else. Fewer returns, fewer regrets, and a layout you trust.

What a good one does

Build the room to scale

Set your real dimensions so every piece takes up the space it actually would.

Drag in furniture

Place sofas, tables, and beds, then move them around until the layout works.

See it from any angle

Walk around the room on screen and check the fit, the flow, and the feel.

Shop what you place

The best planners use real furniture you can buy, not just generic models.

How Cona does it

Free, in your browser

Cona is a free 3D room planner. You recreate your room to scale, design it with real furniture you can actually buy, and see the whole thing in 3D as you go. No download, no experience needed.

Free home planner →How to design a room in 3D →Design definitions ↓

Definitions

The words you will meet

3D rendering: A computer-made image of your room that looks like a photo, used to preview how a design will look before anything is real.
3D room planner: A tool that lets you lay out and furnish a room in three dimensions, so you can see it from any angle before you buy or move anything.
Augmented reality (AR): Viewing a piece of furniture or a whole design placed into your real room through a phone camera.
Design style: A consistent look for a room, like japandi, mid-century modern, or Scandinavian, that ties the pieces together.
Floor plan: A view of a room or home from above that shows the walls, doors, and how the space is laid out, drawn to scale.
Home planner: A tool for designing and furnishing the rooms in your home, usually in both 2D and 3D. Cona is a free home planner.
Photorealistic render: A 3D render made to look as close to a real photo as possible, with realistic light, shadows, and materials.
Real-time 3D: A 3D view that updates instantly as you move furniture, so you see each change the moment you make it.
Room layout: How the furniture and fixtures are arranged within a room, and how well they fit the space and how you move through it.
Room scan: An optional way to capture your room's shape with a phone camera or LiDAR sensor, as a starting point instead of measuring by hand.
Shoppable furniture: Real products from actual brands that you can place in your design and buy, not just generic 3D models for show.
To-scale (true-to-size): Drawn at real measurements, so a sofa or table takes up the right amount of space in your plan and the fit is honest.