Baseboard CutPlanner

Your room stays on this device

Free visual trim planner

Plan every baseboard miter cut

Draw the room, enter each wall length, and get a printable cut card for every board. Each card shows the inside or outside 45° miter, long edge, keep side, and upright miter saw position.

  1. 1Build the roomDrag wall pieces.
  2. 8 ft 4 in
    2Add wall lengthsMeasure the wall edge.
  3. MITER SAW
    3Stand it on the miter sawBack to fence. Bottom to table.

Square rooms and 90° corners

Build your cut plan

Drag a wall piece onto the grid to start your room.

Step 1 of 3

Build the room

Drag in wall pieces. Move a whole piece from its middle, or grab either round end to resize and rotate it.

Grab a piece

Drag a piece onto the grid. You can also tap a piece to add it.

What are you cutting?
Room drawing canvas Build a room from wall and door or no-trim pieces. Drag the middle of a piece to move it. Grab either round endpoint to resize or rotate it.

Board-by-board directions

How to read your baseboard cut cards

Every cut card matches one labeled wall in your room drawing. Use the wall measurement on the back edge—the edge that sits against the wall. The card shows which end to cut, whether the saw turns left or right, which side to keep, and how to stand the board upright.

Cut settings for each baseboard end type
End typeSaw settingLong edge
Inside corner45°Back / wall edge
Outside corner45°Front / room edge
Door or no-trim opening0°Square end

Inside corner: back edge is long

At a 90° inside corner, the back edge that touches the wall reaches the corner. The finished front edge becomes shorter after the 45° cut.

Outside corner: front edge is long

At a 90° outside corner, the finished front edge wraps around the corner and becomes the long point. The back edge stops at the wall corner.

Door or opening: use a square end

When trim stops at a doorway, casing, or other opening, the planner calls for a 0° square cut instead of a corner miter.

Measure the wall edge

How to measure baseboard for 45° miter cuts

Measure each wall corner to corner at trim height. Enter that measurement in feet, inches, and fractions. The planner puts it on the back edge of the board—the edge against the wall—so the cut card can show the correct long point and waste side. The room drawing shows the shape; your measurement controls the cut length.

Real rooms are not perfectly square

This planner makes a clear starting plan for 90° corners. Measure twice at trim height. Use scrap to test the angle, leave the board slightly long when unsure, and shorten it only after a dry fit. Inside baseboard corners can also be coped; coping is not included in this planner.

Common questions

Baseboard cut planner FAQ

What angle do I cut baseboard for a 90° corner?

Cut each mating board at 45° so the two pieces form a 90° corner.

Do I cut the front or back of baseboard?

A 45° cut passes through the whole board. At an inside corner, the back edge that touches the wall is the long point. At an outside corner, the finished front edge is the long point.

Where do I measure a wall for this planner?

Measure corner to corner along the wall at trim height. Every cut card puts that measurement on the back edge of the board—the edge that touches the wall.

How do I tell an inside corner from an outside corner?

An inside corner folds inward, like a corner in a simple bedroom. An outside corner projects into the room, like the edge of a column or a short return wall.

Does this work for corners that are not 90°?

No. This planner currently creates 45° miter cut cards for 90° room corners. Make a scrap test and dry-fit every piece because real walls can vary.

Should I cope inside baseboard corners?

Coping often fits imperfect inside corners better. This planner currently creates miter cut cards for 90° corners; it does not create coping instructions.

Can I print the baseboard cut cards?

Yes. After entering every wall measurement, choose Print all cut cards to make a board-by-board reference for the saw.

Can I plan quarter-round cuts too?

Yes. Choose quarter round before drawing. The cut card shows its wall-flat side against the fence and its floor-flat side on the table.

Is my room plan uploaded?

No. The room shape and measurements stay in your browser and are not uploaded. Nothing is saved unless you turn on Save on this device.