Construction Calculators & Converters

Essential tools for property, land, and building work.

22 tools

About Construction

Construction and property calculators for builders, contractors, architects, real-estate buyers, and DIYers — concrete volume, tile quantity, paint coverage, brick count, plot area (3 to 8 sided), room area, square footage, roofing, stair, fence, lumber, drywall, gravel, HVAC sizing, and more. Built for Pakistani Marla/Kanal/Acre as well as imperial and metric units.

Whether you're estimating concrete for a 10-Marla single-story house, ordering enough tile for a kitchen renovation with 10% waste built in, sizing the AC for a Lahore living room in summer, or calculating the area of an irregular 5-sided agricultural plot — these tools save hours of manual measurement and pricing math.

Pakistani land units

Native Marla/Kanal/Acre support with all three Marla systems (Shahi 272 / Big 250 / Small 225 sq ft).

Waste % built in

Tile/paint/brick/drywall/gravel calculators include a customizable waste factor — never run out mid-project.

Print + share

Plot area, room area, and quantity reports include a print-ready PDF certificate with diagram, measurements, and pricing.

Most Used

Most Popular in Construction

The 4 tools our users open most often in this category.

4 picks

Plot Area Calculator (4-Sided)

Calculate plot area from four sides (North, South, East, West) in Marla, Kanal, and Acres.

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Tile Calculator

Calculate the number of tiles needed for any floor or wall, plus waste.

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Paint Calculator

Calculate liters of paint needed for walls, accounting for doors and windows.

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Concrete Calculator

Calculate cement, sand, and aggregate quantities for your concrete mix.

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All Construction Tools

Browse all 22 calculators

Tile Calculator

Calculate the number of tiles needed for any floor or wall, plus waste.

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Paint Calculator

Calculate liters of paint needed for walls, accounting for doors and windows.

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Concrete Calculator

Calculate cement, sand, and aggregate quantities for your concrete mix.

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Brick Calculator

Calculate the number of bricks needed for a wall with mortar allowance.

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Square Footage Calculator

Calculate area in square feet and convert to other area units.

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Plot Area Calculator (4-Sided)

Calculate plot area from four sides (North, South, East, West) in Marla, Kanal, and Acres.

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Plot Area Calculator (3-Sided / Triangular)

Calculate the exact area of a triangular plot from three side lengths using Heron's formula. Marla, Kanal, Acre.

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Plot Area Calculator (5-Sided / Pentagonal)

Estimate the area of a 5-sided pentagonal plot from its five side lengths. Cyclic-polygon method.

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Plot Area Calculator (6-Sided / Hexagonal)

Estimate the area of a 6-sided hexagonal plot from its six side lengths. Cyclic-polygon method with Marla, Kanal, Acre conversion.

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Plot Area Calculator (7-Sided / Heptagonal)

Estimate the area of a 7-sided heptagonal plot from its seven side lengths. Cyclic-polygon method.

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Plot Area Calculator (8-Sided / Octagonal)

Estimate the area of an 8-sided octagonal plot from its eight side lengths. Cyclic-polygon method.

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Room Area Calculator

Calculate total area across multiple rooms and spaces.

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Wallpaper Calculator

Calculate the number of wallpaper rolls needed for a room.

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Flooring Calculator

Calculate boxes of flooring needed and estimated cost.

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Solar Panel Calculator

Calculate panels needed, system cost, monthly generation, and payback period for a solar setup.

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Roofing Calculator

Calculate roof surface area, shingle bundles, and squares for gable, hip, or shed roofs based on pitch and footprint.

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Stair Calculator

Plan stair risers, treads, total run, and stringer length. IRC code compliance check + side-view diagram.

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Fence Calculator

Estimate posts, panels, rails, and concrete bags for a fence. Plan-view diagram + 60lb / 80lb concrete bag counts.

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Lumber Board Feet Calculator

Calculate board feet for one or many lumber sizes. Add cost-per-board-foot for a total-cost estimate.

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Drywall Calculator

Calculate drywall sheets, joint compound, tape, and screws for a room. Subtracts doors and windows automatically.

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Gravel, Sand & Aggregate Calculator

Calculate volume in cubic yards/metres + weight in tonnes for gravel, sand, topsoil, mulch, and concrete.

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HVAC BTU Sizing Calculator

Estimate cooling and heating BTU/hr for any room. Climate, sun, insulation, and occupancy adjustments + AC tonnage.

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Frequently Asked Questions

Why does my plot area differ from the listed area?

Several reasons: (1) different Marla-size assumption (272 vs 250 vs 225 sq ft); (2) the surveyor's averaging method approximates irregular plots; (3) built-up area vs plot area confusion. A 1-3% variance is normal — larger differences warrant a Patwari survey.

How much waste should I add for tiles or paint?

Standard guidance: 10% for straight-grid tile, 15% for diagonal/herringbone, 5-10% for paint, 10-15% for brick. The calculators default to these values but you can override per project.

Is the HVAC BTU calculator accurate enough to size an AC?

It's accurate to within 20% for typical homes — fine for shopping for window units or splits. For commercial spaces or precise central-AC design, use Manual J load calculation (or hire an HVAC engineer).

Are these tools for legal property documentation?

For initial screening, yes. For legal property transactions, always demand a Patwari-certified demarcation with corner-marker GPS coordinates — a calculator is not a substitute for a licensed surveyor.