Square Footage Calculator

Add rooms and shapes. Use the Cutout toggle to subtract closets or pillars. We’ll total ft² and m², add waste, and estimate cost.

What this calculator does

This page builds area from simple pieces. Add rectangles for rooms, triangles for odd corners, and circles for round entries or bay windows. When something shouldn’t count—closets, a fireplace bump-out, a stair opening—mark it as a Cutout so it subtracts from the total. You’ll see running totals in both ft² and m², optional waste, and a quick materials cost using your unit system.

It’s made for floor coverings, paint coverage planning, roofing sheathing checks, and takeoffs where speed matters more than CAD precision. If you need tile or paint specifics later, jump to the Tile Calculator or the Paint Calculator. For wallboard, there’s a dedicated Drywall Calculator.

Settings

If using feet & inches, this is per ft². If meters, per m².
Pricing per ft²

Rooms & shapes

Name Shape Dimensions Cutout Area Actions

Totals

Grand total (ft²)0
Grand total (m²)0

How to use this calculator

  1. Pick your units. “Feet & inches” is handy for remodels. Switch to meters for metric plans—the totals update automatically.
  2. Start with rectangles. Most rooms break down into rectangles. Name them (“Living room,” “Hall”) so the CSV is readable later.
  3. Add special shapes. Use circles for round features (diameter), triangles for angled bays (base × height / 2). If a space is irregular, split it into smaller shapes.
  4. Subtract voids. Flip the Cutout toggle for closets, columns, or stair openings. These areas subtract from totals.
  5. Apply waste. Enter a percentage to cover offcuts and pattern matching. Flooring often runs 5–15% depending on layout complexity.
  6. Estimate material cost. Put in price per ft² or m². The estimate applies to the area with waste.
  7. Export CSV. Use the CSV for quotes, purchase orders, or a project file. It includes per-shape areas and roll-ups.

Planning finish counts next? Try the Tile Calculator and Paint Calculator.

Reading your results

Net vs. total with waste. Net area is the sum of shapes minus cutouts. “Total with waste” adds your chosen overage so ordering is safe even with layout losses.

Unit pricing. The cost line uses your active unit system. Switching units leaves your price as-typed—update it if you change systems.

Accuracy tips. Keep dimensions consistent (don’t mix feet-only and feet+inches in one entry). If a room has jogs, split the room into rectangles rather than trying to force overlapping shapes.

FAQ

What waste percentage should I use?

Simple square rooms might need 5–7%. Herringbone or diagonal patterns can need 10–15% or more. If you’re matching dye lots later, lean higher.

How do I handle an L-shaped room?

Split it into two rectangles. Name each part (e.g., “Kitchen A” and “Kitchen B”). The total will match the L exactly when the pieces don’t overlap.

Can I enter centimeters or millimeters?

Switch to meters and enter decimals (e.g., 2.45 m). The calculator converts to ft²/m² automatically.

Does cost include tax or delivery?

No—just material at the per-area price you provide. For purchase totals with tax, use the Sales Tax Calculator.