Area Calculator
Calculate the area of a rectangle from length and breadth — pick each measurement's own unit and it converts automatically.
What this calculator does
Calculates the total surface area of a rectangle from its length and breadth, automatically converting between units if the two measurements aren't given in the same unit.
Who this is for
Anyone buying flooring, paint, turf, or tiling and needing to know how much surface area to cover, estimating a room or plot's size, or checking a manual area calculation for a homework problem or renovation quote.
How this calculator works
Area = Length × Breadth. Since length and breadth are often measured in different units in real life (a room measured in feet, a plot of land in meters), this calculator converts both measurements to meters internally before multiplying, then shows the result in square meters, square feet, and square centimeters so you can use whichever your project needs.
Worked example
A room 5 meters long and 4 meters wide: Area = 5 × 4 = 20 square meters (about 215 square feet). If you were buying flooring priced per square foot, you'd need coverage for roughly 215 sq ft, plus a typical 10% allowance for cuts and waste — so budgeting for about 237 sq ft of material.
Common mistakes
- Mixing units without converting first. Multiplying a length in feet directly by a breadth in meters gives a meaningless number — always convert to the same unit before multiplying, or let this calculator do it for you.
- Confusing area with perimeter. Area (square units) measures surface covered; perimeter (linear units) measures the distance around the edge — use the Perimeter Calculator if you need the boundary length instead.
- Forgetting to convert inches to decimal feet. "10 feet 6 inches" needs to become 10.5 feet before entering it as a single feet value.
- Not accounting for waste when ordering materials. The exact calculated area rarely matches what you need to buy — tiling, flooring, and turf all typically need 5-10% extra for cuts, offsets, and pattern matching.
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Frequently Asked Questions
How much extra material should I buy beyond the calculated area?
A common rule of thumb is 5-10% extra for cuts, waste, and pattern matching, though this varies by material — always check specific supplier guidance for flooring, tiling, or turf.
What if my length and breadth are in different units?
Just pick each measurement's own unit from its dropdown — this calculator converts both to a common unit automatically before multiplying, so you never have to convert cm to m by hand first.
How do I find the area of a room in square feet from measurements in feet and inches?
Convert inches to a decimal foot first (e.g. 10 ft 6 in = 10.5 ft), then enter both length and breadth in feet.
Does this work for non-rectangular shapes?
No, this calculates rectangle (or square, when length equals breadth) area only. Triangles, circles, and irregular shapes need different formulas.