Calculate total room or floor area from rectangular sections. Add one or many rooms, set quantities for identical spaces, choose input and output units, and round the result. Uses exact metric–imperial factors for consistent results.
How to use
- Select the input units for length and width: square meters (m²), square feet (ft²), square yards (yd²), or ping/tsubo/pyeong.
- Add a room or section. Enter length, width, and quantity if several rooms share the same dimensions.
- Add more rooms or remove a row if you no longer need it.
- Select the output units. The tool converts the total to your chosen unit and also shows the SI reference in m².
- Use Copy result to place the formatted total on your clipboard.
What the tool includes
- Multiple rectangular sections with per-row quantity.
- Area conversion between m², ft², yd², and ping/tsubo/pyeong.
- Rounding control from 0–4 decimals for reporting consistency.
- Readable outputs with unit symbols and a parallel SI total.
Units and exact factors
Square meter (m²) — SI area unit. One square meter equals a square of 1 m by 1 m. Exact conversions: 1 m² = 10.76391041671 ft²; 1 m² = 1.1959900463 yd²; 1 m² ≈ 0.3025 ping.
Square foot (ft²) — imperial/US customary area unit. One square foot equals a square of 1 ft by 1 ft with 1 ft = 0.3048 m. Exact conversion: 1 ft² = 0.09290304 m²; 1 ft² = 0.1111111111 yd²; 1 ft² ≈ 0.009290304 ÷ 3.305785 ping.
Square yard (yd²) — imperial/US customary area unit. One square yard equals a square of 1 yd by 1 yd with 1 yd = 0.9144 m. Exact conversion: 1 yd² = 0.83612736 m²; 1 yd² = 9 ft²; 1 yd² ≈ 0.2529 ping.
Ping / Tsubo / Pyeong — common real-estate area unit in parts of East Asia. Widely treated in practice as 1 ping ≈ 3.305785 m² (very close to the exact tsubo based on the modern shaku). Conversions used in this tool: 1 ping ≈ 3.305785 m²; 1 ping ≈ 35.583174 ft²; 1 ping ≈ 3.957019 yd².
You need to know the exact area of the room in order to cover the floor with linoleum, stone or other material.
Formula
Per row: area = length × width. With quantity: area = length × width × quantity. Total area = sum of all row areas. The calculator performs the sum in the chosen input unit, converts to m² internally, then converts to the selected output unit using exact factors.
Practical notes
- Measure interior dimensions or plan dimensions consistently; mixing inside and outside measurements inflates totals.
- Doors, windows, and minor fixtures do not change floor area; only subtract structural voids or non-rectangular gaps by modeling them as separate rows and assigning a negative quantity if your use case requires deductions.
- For L-shaped rooms, split the shape into rectangles and add each as a row.
- Use zero decimals for listing summaries, two decimals for most quotes, and four decimals for technical takeoffs.
Typical uses
- Flooring, carpet, tile, laminate, or epoxy coverage planning.
- Paint estimates for floors or ceilings when area drives cost.
- Real-estate listings and plan check cross-verification.
- Facility space audits and occupancy calculators that require m².
Accuracy
- Imperial–metric conversions are exact by definition: 1 ft = 0.3048 m; 1 yd = 0.9144 m; 1 ft² = 0.09290304 m²; 1 yd² = 0.83612736 m².
- The ping/tsubo/pyeong factor used here is 3.305785 m² per unit, which aligns with common practice for property measurements.
- Results are only as accurate as the measurements entered; round after you complete all additions to avoid cumulative rounding error.
FAQ
- Can I mix units within one project? Enter all rows in the same input unit for consistency, then choose any output unit for reporting.
- How do I handle non-rectangular spaces? Decompose the space into rectangles and add each as its own row with its own quantity.
- Why show both total and SI reference? Many jurisdictions specify floor area in m²; the dual output helps with compliance and cross-checking.
Tell us how you use this calculator and what other measurement tools you’d like to see next. Welcome to the comments section!
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