Plan any build more confidently using the Lumber Calculator, BTU Calculator, Deck Stair Calculator, Metal Roof Cost Calculator, and Lumber Shrinkage Calculator — plus the Pipe Volume Calculator for plumbing runs and the Chain Link Fence Cost Calculator for perimeter budgeting. Whether you're framing a deck or sizing an HVAC system, the math is covered.
Browse the full list, sorted by how other builders actually use it, or open the Trending tab for what's popular this week. Every tool is completely free, requires no account, and works on any phone, tablet, or laptop.
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Metal Weight CalculatorCalculate the weight of metal bars, tubes and plates from dimensions and material density. Supports steel, aluminium, copper, brass and stainless.
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Angle of Repose CalculatorCalculate the angle of repose of a granular material pile from its height and base radius using theta = arctan(h/r). Instant degrees and radians.
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Arch CalculatorFree Arch Calculator: enter span and rise to find the radius, diameter, arc length and central angle of a circular (segmental) arch.
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Pipe Volume CalculatorCalculate pipe volume easily with versatile input options. Enter diameter and length in inches, feet, cm, or meters. Get results in cubic inches, feet, cm, m, liters, or gallons for precise measurements.
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Roll Length CalculatorCalculate the length of material wound on a roll from the outer diameter, inner core diameter, and material thickness. Fast, accurate estimates.
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Tank Volume CalculatorCalculate the volume and capacity of horizontal or vertical cylindrical tanks in cubic meters, liters, and US gallons from diameter and length.
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Aluminum Weight CalculatorCalculate the weight of aluminum bars, round bars, tubes and sheets from dimensions using density 2.70 g/cm³. Get weight in kg and grams instantly.
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Copper Wire Weight CalculatorCalculate the weight of solid copper wire from its diameter and length. Uses copper density 8960 kg/m³ to return mass in kg and grams.
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Glass Weight CalculatorCalculate the weight of a glass pane or sheet from its length, width and thickness using glass density (default 2.5 g/cm³). Get weight in kg and grams.
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Pipe Weight CalculatorCalculate the weight of a hollow pipe from outside diameter, inside diameter, length and material density. Free, fast pipe weight calculator in kg.
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Price per Acre CalculatorCalculate the price per acre of land instantly. Enter the total price and number of acres to find the cost per acre for any property.
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Breaker Size CalculatorCalculate the minimum circuit breaker amperage from load power and voltage, with the 1.25 continuous-load safety factor (US NEC 80% rule).
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Slot Machine RTP CalculatorCalculate how many wallpaper rolls you need for a room. Enter wall size, roll dimensions and pattern repeat to get rolls, strips and strips per roll.
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Square Footage of Walls in a Room Calculator (Wall Area + Drywall Sheets)Calculate how many drywall sheets you need for a room. Enter length, width and wall height, pick a sheet size, add waste — get total sheets fast.
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Snow Load CalculatorCalculate roof snow load from snow depth and density, or the ASCE 7 flat-roof snow load using ground snow load and exposure, thermal and importance factors.
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Rational Method Stormwater Runoff CalculatorCalculate peak stormwater runoff with the Rational Method Q=CiA. Enter runoff coefficient, rainfall intensity and drainage area for US (cfs) or SI (m³/s).
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Rug Size CalculatorFree rug size calculator. Enter your room dimensions and desired floor border to get the ideal rug length, width, and area in feet.
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Brick Wall CalculatorCalculate how many bricks you need for a wall. Enter wall dimensions, brick size, mortar joint and waste to estimate total bricks required.
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Shingle Bundle CalculatorEstimate how many shingle bundles you need for your roof. Enter roof dimensions, planes, waste allowance, and bundles per square to get a quick count.
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Mortar Mix CalculatorCalculate the cement and sand needed for a mortar mix. Enter wall area, mortar thickness and mix ratio to get bags of cement, sand volume and dry volume.
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Play Sand CalculatorCalculate how much play sand you need for a sandbox or play area. Enter length, width and depth to get volume, weight in pounds, and number of bags.
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Soil Volume CalculatorCalculate how much soil you need for raised beds and gardens. Get cubic feet, cubic yards, liters, and number of bags from length, width, and depth.
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Mulch Bags CalculatorCalculate how many bags of mulch you need for your garden bed. Enter length, width, depth, and bag size to get exact bag count instantly.
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Mortar Calculator for SlabsEstimate mortar volume, cement and sand needed to lay paving slabs. Enter area, bed thickness and wastage for an instant 1:5 mix material estimate.
Frequently asked questions
What types of construction projects can I calculate here?
The collection spans residential and light commercial work — roofing, decking, framing, fencing, HVAC sizing, and plumbing. You can estimate material quantities with the Lumber Calculator, plan pipe layouts with the Pipe Volume Calculator, and scope heating needs with the BTU Calculator, all from a single page.
How accurate are the results?
Each calculator uses standard construction formulas cross-checked against industry reference values. Results are reliable estimates for planning and budgeting. For safety- or code-critical work — structural sizing, load-bearing elements, or mechanical systems — always verify against the applicable building code and have a qualified engineer or licensed contractor review your figures.
Do you store or share the measurements I enter?
No. All calculations run directly in your browser. Nothing you type is sent to our servers, saved to a database, or shared with any third party.
Which construction calculators are used most?
The Lumber Calculator, BTU Calculator, and Deck Stair Calculator consistently top the rankings. The Metal Roof Cost Calculator and Pipe Volume Calculator also see heavy use. The full list is sorted by real usage, and the Trending tab shows which tools are gaining traction right now.
Is there any cost or sign-up required?
None at all. Every tool here is completely free — no account, no subscription, no hidden fees. Open any calculator on your phone or desktop and start entering your measurements immediately.
