BUILDING & PLANNING · 65 TOOLS
Building & Planning Calculators
Building and planning calculators: rooms, stairs and openings; FAR and space use; site grading, cut and fill balance, access roads and fencing; waterproofing, drywall, false ceilings and metal roofs; drainage runs, rainwater and water tanks; lighting layouts; structural floor loads; post-construction cleaning; construction and equipment loans; and construction duration, labour, equipment output and material deliveries, plus roofing, staircase, carpet area, building and home construction cost, project takeoffs for basements, swimming pools, sheds, compound walls, marriage halls and shops, material density, and everyday maths for site and office: time and hours, percentages, margin and markup, cash counting, tips, profit margins, fractions, ratios, LCM, GCF, factors, primes, long division, quadratics, lines and slopes, midpoints, distances, running pace, circle, trapezoid and cylinder geometry, and statistics.
AC Tonnage CalculatorFind the AC size you need in tons, BTU/h and kW from floor area, climate, sun, people and ceiling height. For single rooms or whole houses, US to South Asia.Basement Construction Cost CalculatorEstimate the cost to build a basement from its size and depth: excavation, concrete walls and slab, waterproofing and finishing, priced at your local rates.Building Space Utilization CalculatorCalculate floor area ratio (FAR / FSI), ground coverage, net-to-gross efficiency and area per person, and check them against the allowed limits.Building Water Tank PlannerPlan building water storage: daily demand from occupants, storage with fire reserve, overhead tank and underground sump sizes, and pump flow to fill. Free accountCarpet Area CalculatorConvert between carpet area, built-up area and super built-up area for a flat or apartment, using wall and loading percentages. sq ft and m².Circle Area CalculatorFind the area of a circle from its radius, diameter or circumference with the formula A = πr², plus the circumference, in m² or ft², with every step shown.Compound Wall Construction Cost CalculatorEstimate a compound (boundary) wall: foundation, concrete base, RCC pillars, bricks or blocks and plaster, and the cost per metre or foot at your rates.Construction Cost CalculatorEstimate the cost to build from built-up area, number of floors and your local rate per m² or ft², with contingency and design fees. Any currency.Construction Duration CalculatorEstimate construction duration from quantities, output per crew-day and crews: working days with overlap and risk allowance, weeks and finish date. Free accountConstruction Equipment Loan CalculatorWork out the monthly payment, total interest and full cost of a loan for an excavator, loader, truck or other machine, with down payment, trade-in and tax.Construction Equipment Productivity PlannerEstimate excavator, loader or dozer output from bucket, fill factor and cycle time, or roller output from width, speed and passes, and days for the job. Free accountConstruction Loan CalculatorEstimate interest on a construction loan drawn in stages while your house is built, the interest-only payments, fees, and the mortgage payment after.Construction Site Fencing CalculatorCalculate construction site fencing around a site with gates: temporary mesh panels, feet, clamps and stays, or hoarding and chain-link posts and rails.Cut & Fill Balance CalculatorBalance earthworks cut against compacted fill using shrinkage and swell: cut needed, surplus to export or shortfall to import, balance % and truck loads.Density CalculatorCalculate density, mass or volume for construction materials, and convert to unit weight in kN/m³ and lb/ft³. Concrete, steel, sand, soil and more.Distance CalculatorFind the straight-line distance between two latitude and longitude points in km, miles and nautical miles, with the bearing, or distance from speed and time.Door & Window Opening PlannerPlan door and window openings for a room: glazing and openable area as a percentage of floor area (IRC 8% and 4% rules), lintel lengths and frame perimeter.Drywall Partition CalculatorCalculate a drywall (plasterboard) stud partition: boards per face and layer, studs, floor and head track, screws, joint tape and cavity insulation. Free accountFactor CalculatorList every factor of a number, its factor pairs and prime factorisation, how many factors it has and their sum, with each step of the working shown.False Ceiling Material CalculatorCalculate false ceiling materials: 600 × 600 grid tiles, main runners, cross tees, wall angle and hangers, or an MF plasterboard ceiling with channels. Free accountFraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers such as 2 3/4 + 1 5/8, with the answer in lowest terms, as a decimal and in mm for inches.GCF CalculatorFind the greatest common factor (GCF or HCF) of 2 to 5 numbers, with common factors, prime factors and Euclid's method, for tiles, panels and cut lengths.Home Construction Cost CalculatorBudget the full cost to build a house: construction split by stage, design fees, permits, contingency and land, with the all-in cost per m² or ft².Hours CalculatorCount the hours between two dates and times, such as an equipment hire period or the age of concrete since a pour, in hours, days, minutes and weeks.Labour Productivity CalculatorCalculate labour for a task: worker-hours from a productivity norm and site efficiency, duration, crew needed for a target, labour cost and cost per unit. Free accountLeast Common Multiple CalculatorFind the least common multiple (LCM) and greatest common factor (GCF) of 2 to 5 numbers, with prime factors and steps, for tiles, modules and schedules.Lighting Layout PlannerPlan a room's lighting by the lumen method: number of luminaires for the target lux, grid layout and spacing, illuminance achieved and electrical load. Free accountLong Division CalculatorDivide whole numbers by long division, step by step, with the quotient and remainder, the decimal answer, the mixed number and a check of the result.Manhole Drain Run PlannerPlan a drain run through several manholes: invert levels from gradients and drops, depth to invert and cover over the pipe at each manhole, with warnings. Free accountMargin CalculatorWork out gross profit margin and markup from cost and selling price, or the selling price for a target margin or markup, with the difference explained.Marriage Hall Construction Cost CalculatorSize and cost a marriage or banquet hall from the number of guests: hall, dining, kitchen, stage, rooms and parking areas, then the cost at your local rates.Material Delivery & Stock PlannerPlan site material deliveries: reorder point from daily use, lead time and safety stock, number of deliveries, interval, maximum stock and dates. Free accountMedian CalculatorFind the median of a list of numbers: sorted, with the middle value or the average of the two middle values, plus the mean, mode and quartiles to compare.Midpoint CalculatorFind the midpoint between two points, the distance between them and the slope of the line, from x and y coordinates or site eastings and northings.Money CalculatorCount cash fast: enter how many of each note and coin to total US, Canadian, Australian dollars, pounds or rupees, with the notes and coins split out.Pace CalculatorWork out running or walking pace per km or per mile from distance and time, your finish time from a target pace, or how far you go, with speed.Percent Change CalculatorFind the percent change from an old value to a new one, as an increase or decrease, with the change, the multiplier and the percent difference.Percentage Increase CalculatorIncrease or decrease a value by a percentage, or find the value before an increase, such as a price before tax or markup, with every step shown.Point Slope Form CalculatorWrite the equation of a line in point-slope form from a point and a slope or from two points, with slope-intercept and standard forms and the intercepts.Post Construction Cleaning CalculatorEstimate post-construction cleaning cost and crew time for rough, final and touch-up cleans from the floor area and your rates per m² or ft², plus extras.Prime Number CalculatorCheck whether a number is prime, see its smallest factor and prime factors, the next and previous primes, or list every prime between two numbers.Profit Margin CalculatorCalculate gross, operating and net profit margins from revenue, direct costs, overheads, interest and tax, for a business, a year or a single project.Quadratic Formula CalculatorSolve ax² + bx + c = 0 with the quadratic formula: real or complex roots, discriminant, vertex, axis of symmetry and y-intercept, with every step shown.Ratio CalculatorSimplify ratios, solve proportions (A : B = C : x) and divide a total in a ratio such as a 1:2:4 concrete mix, with the working shown step by step.Roof Material & Geometry CalculatorCalculate a profiled metal sheet roof (slope length and rise from pitch, sheets per slope with end laps, purlins, ridge capping and fasteners) for a gable roof. Free accountRoof Rainwater Planning CalculatorPlan roof rainwater: design runoff in L/s from rainfall intensity (rational method), number of downpipes, annual rainwater harvest and a suggested storage tank. Free accountRoofing CalculatorCalculate roof area from building size, overhang and pitch, then roofing squares, shingle bundles and rafter length. Pitch in x/12 or degrees.Room Layout & Dimension CalculatorCalculate a room's floor area, perimeter, gross and net wall area, ceiling area, volume, skirting length and diagonal, plus a 3-4-5 check for squaring corners.Shed Construction Cost CalculatorEstimate the cost to build a shed of any size: floor, wall and roof areas from the size and roof pitch, gable or lean-to, priced at your local rates.Shop Construction Cost CalculatorEstimate the cost to build a retail shop: building shell by floor area, rolling shutter or shopfront, mezzanine and fit-out, with fees and contingency.Site Grading CalculatorGrade a site to a planar platform with drainage falls: design levels at each corner, cut or fill at the corners, and total cut, fill and net volume.Slope Intercept Form CalculatorFind y = mx + b from two points, a point and a slope, or the standard form Ax + By = C, with the slope, both intercepts and the angle of the line.Square Footage CalculatorCalculate square footage for rectangles, L-shapes, triangles, circles and trapezoids in ft², m², square yards and acres, with waste and cost.Staircase CalculatorCalculate the number of risers and treads, actual riser height, total run, stair angle, stringer length and concrete for a straight stair flight. mm or inches.Staircase Planning CalculatorPlan a straight, L or U staircase: plan footprint, landings and the stairwell opening length needed for headroom, from floor height, riser and going.Statistics CalculatorPaste a list of numbers to get the mean, median, mode, range, standard deviation, variance, quartiles and coefficient of variation, with steps shown.Structural Load CalculatorWork out dead, live and factored floor loads, then the line load, reaction and moment on a beam or the axial load on a column, to ASCE 7, IS 456 or Eurocode.Swimming Pool Construction CalculatorPlan a concrete swimming pool: water volume, excavation, shell concrete, tile or plaster area, coping and deck, then the cost at your own local rates.Temporary Access Road PlannerPlan a temporary site access road: crushed stone tonnes and volume, geotextile area, passing bays and turning area, and tipper loads to deliver the stone.Time CalculatorWork out hours worked between two times less breaks, add or subtract hours and minutes, and find a finish time, with decimal hours for timesheets.Tip CalculatorWork out the tip and the total for any bill, split it between any number of people, and round each share or the total up, with tipping norms by country.Trapezoid Area CalculatorFind the area of a trapezoid (trapezium) from its two parallel sides and height, plus the perimeter, in m² or ft², for plots, trench sections and walls.Variance CalculatorCalculate the sample or population variance of a list of numbers, with the mean, each squared deviation, the sum of squares and the standard deviation.Volume of Cylinder CalculatorFind the volume of a cylinder from its diameter or radius and height, in m³ and litres or ft³ and US gallons, plus surface area, for tanks, piles and columns.Waterproofing Material PlannerPlan waterproofing for roofs, basements and wet areas: liquid or cementitious coatings by coats and consumption, or membrane rolls with laps and primer. 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