90 tools

Construction, home and auto

90 free construction, home and auto tools, all running in your browser with no sign-up.

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Concrete calculator (m³ and cubic yards)Work out the concrete volume for a slab, footing or wall in cubic metres and cubic yards, with your own waste allowance.
Concrete column calculator (round or square)Find the concrete volume for round or square columns and tube forms from the diameter or side, the height and the count.
Concrete mix calculator: cement, sand, aggregateGet the cement bags, sand and coarse aggregate for a concrete volume from a nominal mix ratio such as 1:2:4 or 1:1.5:3.
Concrete bag calculator (premix bags)Find how many premixed concrete bags you need for a small pad or path from its area, depth and the yield printed on the bag.
Plaster calculator: cement and sandEstimate cement bags and sand for wall plastering or rendering from the area, the coat thickness and a mix ratio such as 1:4 or 1:6.
Brick calculator with mortar volumeCount the bricks for a wall from its size, the brick dimensions and mortar joint, with the mortar volume and a waste allowance.
Concrete block calculator for wallsCount the concrete blocks for a wall from its area, the block face size, the mortar joint and a waste allowance, for any block size.
Tile calculator: tiles and boxesWork out how many floor or wall tiles and boxes you need from the room size, the tile size, tiles per box and a waste allowance.
Tile grout calculatorEstimate the kilograms of grout for tile joints from the tile size, tile thickness, joint width and the tiled area, with bag count.
Paint calculator for a roomCalculate litres of paint and cans for a room's walls and ceiling from its size, openings, number of coats and paint coverage.
Wallpaper roll calculatorWork out how many wallpaper rolls you need from wall width and height, roll size and pattern repeat, with strips per roll.
Drywall calculator (plasterboard sheets)Count the drywall or plasterboard sheets for walls, partitions or ceilings from the area, sheet size, sides covered and waste.
Rebar weight calculatorCalculate reinforcing steel weight in kilograms and tonnes from bar diameter, length and number of bars, with kg per metre.
Gravel calculator (tonnes and m³)Work out gravel, crushed stone or sand for a driveway or garden in cubic metres and tonnes from the area, depth and density.
Asphalt calculator (tonnes)Work out the tonnes of hot mix asphalt to pave a driveway or car park from the area, compacted thickness and density.
Laminate flooring and skirting calculatorWork out the packs of laminate, parquet or vinyl flooring and skirting board lengths from the room size, pack coverage and waste.
Concrete stairs calculatorFind the concrete volume for solid steps poured on the ground from the number of steps, width, riser height and tread depth.
Slab rebar calculator (bar grid)Count the bars in a slab or floor mesh and get their total length and weight from the slab size, spacing, cover and bar diameter.
AC size calculator (BTU and tons)Estimate the air conditioner size for a room in BTU/h and tons from floor area, sun exposure, occupants and kitchen use.
AC efficiency calculator (EER, COP)Work out an air conditioner EER, COP and kW per ton from the cooling capacity and electrical input shown on its label.
AC running cost calculatorCalculate air conditioner energy use in kWh and monthly running cost from its capacity, EER, running hours and electricity price.
Electricity bill calculator with tiersCalculate an electricity bill from kWh with two price tiers, a fixed fee and VAT, preset to the Saudi residential tariff.
kWh from electricity bill amountFind how many kWh you used from the electricity bill amount after removing VAT and the fixed fee, using two editable tiers.
Meter reading consumption calculatorWork out electricity use from previous and current meter readings, with the daily average, a 30 day projection and a flat-rate cost.
Appliance energy cost calculatorCalculate any appliance energy use in kWh and its daily, monthly and yearly cost from its wattage and hours of use.
LED bulb savings calculatorCalculate the yearly energy and money saved by swapping old bulbs for LED, and how many months the new bulbs take to pay back.
Solar panel calculator: count and system sizeSize a solar system in kW and find the number of panels and roof area needed from your daily usage and peak sun hours.
Solar panel output calculatorEstimate solar panel output in kWh per day, month and year from panel wattage, count and sun hours, plus the value of the energy.
Solar battery size calculatorCalculate solar battery capacity in Ah and the number of batteries in series and parallel from daily load and days of backup.
Solar payback calculatorWork out the solar system payback period in years, net lifetime saving and return from yearly output and electricity price.
Generator size calculatorSize a generator in kW and kVA from running loads, the starting surge of the largest appliance and a safety margin.
Water heater heating time calculatorCalculate how long an electric water heater takes to heat its tank, plus the energy used and its cost, from volume, power and temperatures.
Hot water cost calculatorCalculate the monthly energy and cost of an electric water heater from daily hot water use, temperatures, efficiency and electricity price.
Water tank capacity calculatorCalculate water tank capacity in liters, cubic meters and gallons for rectangular, vertical or horizontal cylinder tanks from their size.
Water tank fill time calculatorCalculate how long it takes to fill a water tank in minutes and hours from its capacity, flow rate and current and target level.
Household water tank size calculatorWork out the water tank size a home needs in liters from the number of people, daily use per person and storage days, with the nearest common size.
Trip fuel cost calculatorWork out the fuel cost of a car trip from distance, consumption and fuel price, with the share per passenger and a round-trip option.
Fuel consumption calculator (odometer)Find your car's real fuel consumption from two odometer readings and the liters filled, in L/100 km, km per liter and miles per gallon.
EV charging cost calculatorCalculate what it costs to charge an electric car from battery size, current and target charge level, price per kWh and charging losses.
EV charging time calculatorEstimate how long an electric car takes to charge from one level to another based on battery size, charger power in kW and efficiency.
Tire size comparison calculatorCompare two tire sizes such as 205/55R16 and 225/45R17 to see the difference in overall diameter, sidewall height, circumference and revs per km.
Speedometer error after tire changeFind your true speed after a tire size change: enter the original and new sizes and the speedometer reading to see the gap in km/h and percent.
Car depreciation calculatorEstimate what your car will be worth after a number of years at an annual depreciation rate you choose, with a year-by-year value table.
Engine displacement calculatorCalculate engine displacement in cc, liters and cubic inches from cylinder bore, piston stroke and the number of cylinders.
Horsepower from torque and rpmCalculate engine power in hp, kW and metric PS from torque in N·m or lb-ft and engine speed in rpm.
Torque from horsepower and rpmCalculate engine torque in N·m and lb-ft from power in hp, kW or metric PS and the engine speed in rpm.
0-100 km/h acceleration calculatorTurn a 0-100 km/h time into average acceleration in m/s² and in g, plus the approximate distance covered during the run.
Engine compression ratio calculatorCalculate static compression ratio from bore, stroke, combustion chamber volume, head gasket size, deck clearance and piston dish or dome volume.
RPM to speed calculator (gear ratio)Work out vehicle speed at a given engine rpm from the gear ratio, final drive ratio and tire size, in km/h and mph.
Power-to-weight ratio calculatorCalculate a car's power-to-weight ratio in hp per tonne, kg per hp and watts per kg to compare performance between cars.
Fuel cost comparison between two carsCompare the yearly fuel bill of two cars from their consumption, your annual distance and the fuel price, and see the saving over the years you keep one.
EV vs petrol running cost calculatorCompare the yearly energy cost of an electric car and a petrol car from consumption, electricity and fuel prices and your annual distance.
Fuel tank range calculatorWork out how far you can drive on the fuel left in the tank from tank size, gauge level and consumption, keeping a reserve you choose.
Wheel offset calculator (ET)Compare two wheels with different width and ET offset to see how far the outer edge moves toward the fender and the inner edge toward the suspension.
Pool volume calculator (liters and gallons)Work out how much water a rectangular, round or oval pool holds in liters, cubic meters and gallons from its size and depth.
Pool fill time calculatorFind how many hours a pool takes to fill from its volume in liters and the hose or tap flow rate in liters per minute.
Pool chlorine dose calculatorCalculate how many grams of granular or tablet chlorine raise your pool free chlorine to the target level, based on product strength.
Pool salt calculatorCalculate how many kilograms of salt a saltwater pool needs to raise salinity from the current reading to the level your chlorinator wants.
Mulch calculatorWork out how much mulch or bark you need for garden beds in cubic meters, liters, cubic yards and bags from the area and depth.
Raised bed soil calculatorCalculate the soil needed to fill one or more raised garden beds in liters, cubic meters and bags from the bed length, width and height.
Fence post and panel calculatorWork out how many fence posts, panels or sections and rails a straight fence run needs from its length and post spacing.
Fence picket calculatorFind how many pickets or vertical boards a fence needs from the fence length, picket width and the gap between boards.
Grass seed calculatorCalculate how much grass seed you need for a new lawn or overseeding in kilograms and bags from the area and seeding rate.
Sod and turf roll calculatorCalculate how many sod or turf rolls your lawn needs from its length, width and the area of one roll, with a waste allowance for cutting.
Fertilizer calculator by areaCalculate how much fertilizer to spread from the area, the nitrogen rate you want and the NPK numbers on the bag, plus the P and K supplied.
Deck board calculatorCalculate the deck boards, joists and screws for a rectangular deck from its size, board width, gap and board length.
Stair calculator: rise, run and stepsWork out the number of steps, riser height, total run, stringer length and angle of a staircase from the total floor-to-floor rise.
Roof pitch calculatorTurn a roof rise and run into the pitch angle in degrees, percent slope, pitch in 12 and the rafter length factor.
Roof area calculatorCalculate the true area of a sloped roof from the building plan size with overhangs and the pitch, in m², ft² and roofing squares.
Board feet calculatorCalculate lumber volume in board feet and cubic meters from thickness and width in inches, length in feet and quantity, with total cost.
Timber cubic meter calculatorCalculate timber volume in cubic meters from thickness and width in mm, length in meters and piece count, with pieces per m³ and total price.
Rainwater harvesting calculatorEstimate how much rainwater you can collect from a roof in liters and cubic meters from the catchment area, rainfall and runoff coefficient.
Moving box calculatorEstimate how many moving boxes you need from your room count, with per-room box numbers you can edit and a safety margin.
Moving volume calculatorWork out the volume of your boxes and furniture in cubic meters and feet, and the truck capacity you need after load efficiency.
Moving cost calculatorAdd up your moving cost from hourly labor, truck hire, distance and boxes, using prices you enter in any currency.
Room area calculatorFind the area of a rectangular room in square meters and square feet from its length and width in meters, feet or cm, plus the perimeter.
Room volume calculatorCalculate room volume in cubic meters, cubic feet and liters from length, width and height, with floor and wall area.
L-shaped room area calculatorFind the area of an L-shaped room or hall in square meters and square feet by subtracting the cut-out corner from the full rectangle.
Curtain size calculatorWork out curtain rod length, total fabric width, panel count and curtain drop from your window size and chosen fullness.
Curtain fabric calculatorCalculate how many meters of curtain fabric to buy from panel count, finished length, hem allowance and pattern repeat, in meters and yards.
Rug size calculatorFind the largest rug that fits your room while leaving a border to the walls, and the nearest common rug size that fits, in cm.
Mattress and bed size chartSee mattress dimensions in centimeters and inches for US, UK and metric sizes, with a chart comparing every size.
TV viewing distance calculatorFind the right seating distance for a 16:9 TV from its size in inches, using 30 and 40 degree viewing angles and visual acuity for its resolution.
TV size for viewing distance calculatorFind the TV size in inches that suits your seating distance using 30 and 40 degree angles, plus the size at which full resolution becomes visible.
TV mounting height calculatorWork out how high to mount a TV so its center sits at your seated eye level, with the top and bottom edge heights from the floor.
Dining table size calculatorWork out the dining table length for your number of guests and the smallest room that leaves space to pull out chairs and walk around.
Split rent by room size calculatorSplit flat rent fairly between housemates: a shared-space part divided equally and the rest by the size of each person's room.
House cleaning time calculatorEstimate house cleaning time from floor area, a cleaning rate in square meters per hour and the number of cleaners, with cost if you add a rate.
Picture hanging height calculatorFind the nail height from the floor to hang a picture or frame with its center at 145 cm or any height you choose.
Picture frame spacing calculatorSpace several equal-width frames evenly across a wall with equal gaps between them and at both ends, and see where each center goes.