Room Area Calculator
Calculate total area across multiple rooms and spaces.
Construction
Room Area Calculator
Generated on April 24, 2026
Total Area
0 sq ft
0.00 m² · 0.00 Marla
?What is the Room Area Calculator?
A room area calculator sums the area of multiple rooms in a house or building to give you a total floor area in square feet, with conversions to square meters and Marla. Enter each room's length and width — bedrooms, living rooms, kitchen, bathrooms, corridors — and the tool maintains a running total. This is invaluable for estimating materials (flooring, paint, wallpaper), comparing homes, calculating per-square-foot renovation costs, sizing heating and cooling requirements, and verifying a property listing's claimed area against actual measurements.
The Formula
Each rectangular room's area is length times width. Summing the areas of all rooms gives the total floor area — which is what you typically need for whole-home material estimates, cleaning quotes, HVAC sizing, and real-estate valuation. The calculator handles any number of rooms and is particularly useful when different rooms have different shapes and you want a single total without manual addition.
Practical Examples
A typical home: Bedroom (12 × 14) + Living (15 × 18) + Kitchen (10 × 12) + Bath (8 × 6) totals 546 sq ft — enough to plan materials for a full cleanup.
Useful when planning a whole-home flooring or repainting project — the total dictates how many boxes or liters to buy.
Real-estate listings often quote total covered area; this tool lets you independently verify by room.
When dividing a renovation cost by area, using the accurate total gives a fair per-square-foot price for comparison.
Splitting construction costs across multiple buyers (joint ownership) often requires verifying each family's share of total area — use room-by-room entries.
HVAC system sizing typically needs 20–30 BTU/hr per square foot for cooling, so a 1,500 sq ft home needs roughly 30,000–45,000 BTU/hr of cooling capacity.