How to make a floor plan on your Android phone.

1. Check your phone and plan the rooms.

I Measure Pro needs an ARCore-supported Android phone with Google Play Services for AR and the camera permission. Check supported phones and capture tips first.

Walk the space and make a rough sketch. Note which rooms connect and through which doors. Pick feet or meters and keep it for the whole project, and keep a tape measure handy for checking a few walls later.

Plan which rooms go in which project. A project holds up to 15 areas, where an area is a room or a staircase. Measure includes unlimited projects, so a large house can be split by floor.

2. Measure each room with the camera or a template.

Add a room to the project and follow the camera prompts. Tap the room’s corners in order and close the outline. The app shows the room’s floor plan, wall lengths, floor area and perimeter.

After capture you choose Keep as measured or Auto-adjust. Auto-adjust squares up corners that are close to square, so the outline closes neatly; wall lengths and area may change a little. It does not recognize furniture or hidden walls, so place corners on the real floor boundary, not on the edge of a sofa.

For simple shapes, a template can be faster. Choose a rectangle or square, circle, donut, oval or triangle and type the sizes.

3. Add doors and openings to every room.

Mark each opening with the right type: Door, Window, Open doorway or Transition. Openings make the plan easier to read, and they matter for the next step, because the Floor Planner connects rooms at matching doors or openings.

Add each connecting doorway to both rooms it joins. The bedroom door belongs in the bedroom and in the hallway. If a doorway is missing on one side, the two rooms have nothing to match.

4. Arrange and connect the rooms in the Floor Planner.

Open the Floor Planner to place your saved rooms on one plan. Drag a room to move it, twist two fingers to turn it and pinch to zoom. Snap to grid keeps rooms lined up.

• Connect rooms joins two saved rooms at matching doors or openings.
• Snap rooms together lines up a shared wall or doorway.

Rooms are not joined automatically, and room sizes never change when you move or connect them. The plan shows each room as you measured it.

The total is the room areas added up. It leaves out wall thickness and any space you did not measure, so it is not the building’s footprint or its official square footage.

5. Check shared walls in person, then fix one wall or corner.

Look at where rooms meet. A gap or overlap between two rooms usually points to one wall measured short or long, or a corner placed in the wrong spot. Walk to that wall and measure it with a tape from both sides.

Then open the Room Editor, “Fix a wall or corner by hand.” Type the right length for one wall, or move one corner to an exact spot. If your tape reads 11 ft 8 in for a wall, type 11 ft 8 in for that wall, then look at the room again in the Floor Planner. Every change can be undone, and the original camera readings are kept.

6. Print to scale or export the plan.

Print to scale saves a PDF that prints at the scale you choose. A scale of 50 means 1:50: one unit on paper stands for 50 of the same unit in the room. One centimeter on the page is 50 centimeters of floor, and one inch is 50 inches.

Print at 100% or “actual size” so the printer does not shrink the page, then check one wall on the printout with a ruler.

For other software, export an SVG or DXF drawing file to open in CAD, a PNG or JPG picture, a CSV spreadsheet of the measurements or a PDF report.

Optional: build a 3D model.

3D Studio builds a 3D model from your room outlines and the wall heights you enter. Heights are entered, not measured, so check the ceiling height with a tape or laser first. You can view the model, save a 3D picture or export an OBJ file. The OBJ is for viewing and planning, not for fabrication.

Read how to measure a room on Android, then get I Measure Pro for Android. The Floor Planner, Room Editor, 3D Studio, print to scale and every export are included in one plan, Measure, at US$10.99 per month per license.