Home / Calculators
Free calculatorCalculators: how much do you need?
Quantities and cut angles for the jobs around your house, in the units the supply yard sells them. Every one is free. Search for the job, or pick a section.
46 calculators and guides
Construction
Concrete, framing, roofing and trim: the amount to order and how to cut it.
- Concrete calculatorYards of ready-mix or bags for a slab
- Paint calculatorWalls, ceiling, trim and primer in whole quarts, gallons and pails, with the leftover
- Stair calculatorEven risers and treads from the total rise, the stringer length and layout, code checks and a tape-only layout
- Board foot calculatorBoard feet for a board or a whole list, sold size and actual wood, cost and weight
- Roof pitch calculatorPitch to degrees and percent, rafter length, roof area, and how to measure a roof
- Drywall calculatorSheets to buy for your rooms, with screws, joint tape, compound and a cut list
- Roofing calculatorRoof area, squares and bundles from the footprint and pitch, with underlayment, ice barrier, drip edge and metal panels
- Framing and stud calculatorStuds, kings, jacks, cripples, plates and header boards for your walls, doors and windows, with the plate marks
- Rafter length calculatorLength to cut, plumb and seat angles
- Baluster spacing calculatorThe fewest balusters that stop a 4 in ball, the even gap and where to mark, for level and stair rails, with a buy list
- Trim and molding calculatorBaseboard, casing, chair rail, picture rail and wainscoting for your rooms, packed onto boards with a cut list
- Crown molding angle calculatorMiter, bevel and cut list for every wall
Landscaping and yard
Mulch, stone, soil and sod for the yard, and the dumpster for what comes out.
- Gravel calculatorTons of #57, crusher run, pea gravel or river rock, the truck, and the work by hand or machine
- Mulch calculatorCubic yards and bags for any bed
- Soil calculatorRaised beds with your own mix, fill dirt, pots and planters, bags, weight and pickup loads
- Rock calculatorRiver rock, lava rock, decomposed granite and more in tons, yards and bags, with fabric, edging and loads
- Topsoil calculatorYards, tons and bags to fill, level a lawn or build a bed, plus compost
- Sand calculatorTons, yards or bags for pavers, sandboxes, pools, volleyball
- Sod calculatorSquare feet of sod, pallets and rolls, plus grass seed by region
- Dumpster size calculatorYards and tons for the cleanup
Measuring and conversions
Area, volume, fractions, unit conversions and reading a tape measure.
- CM to inchesExact inches, the nearest 1/16 on a tape, feet and inches, height and a chart
- Fraction calculatorAdd, subtract, multiply and divide fractions with every step, decimals and tape marks
- Square footage calculatorSquare feet or square meters of any room, yard or shape, with walls and unit conversion
- Unit converterLength, area, volume, weight, temperature, speed and pressure, exact, with the math
- How to read a tape measureTap the tape to read any line, practice, find half of a length, print a chart
- Volume calculatorAny shape in cubic feet, yards and gallons
- How to read a micrometerTurn a micrometer and watch sleeve, thimble and vernier add up; practice inch and metric
- Cubic feet calculatorCubic feet, gallons, liters and cubic yards of a room, box, truck or container, exact cubic feet to gallons, and will it fit
- Acreage calculatorAcres from any lot shape or corner points, shapes that add up or come away, hectares, lots that fit and fence
- Water weight calculatorGallons or liters to pounds and kilograms at any temperature, tanks, pools, sea water and other liquids
- How to read a caliperDrag the jaws to read vernier, dial and digital calipers, inch and metric, and practice
- Tire size calculatorCompare two tire sizes: height, width, speedometer and odometer error, same-height sizes on other wheels and a sidewall decoder
Home systems
Electrical, heating and cooling, water and solar.
- Ohm's law calculatorAny two of volts, amps, ohms and watts to the other two with the formulas shown, resistors in series and parallel, and LED resistors
- Pool volume calculatorGallons and liters in a round, rectangle, oval or kidney pool, time to fill on a hose, tanker loads and the water weight
- Electricity cost calculatorWatts and hours to kWh, then your own rate to the cost a day, month and year
- Watts, amps and volts calculatorAny two of watts, amps and volts to the third for DC, single-phase or three-phase, with breakers, kW, kVA and horsepower
Fun and seasonal
Snow days, countdowns and the fun ones.
- Christmas lights calculatorStrands of lights for your rooflines, windows and trees, with watts, plugs and circuits and a picture of the house lit up
- Random number generatorFair random numbers from any range, raffle winners and odds
- Coin flipHeads or tails, a fair 3D flip
- Snow day calculatorChance of a closing or delay, the next three mornings
- Dice rollerRoll any dice in 3D, with advantage and exact odds of every total
- Password generatorMake a strong password or passphrase, check one you have, and get a Wi-Fi sign-in code
- Spin the wheelA fair random pick from your own list
- Christmas countdownA live countdown to Christmas in your time zone, with a 52-light tree
- Dog age calculatorA dog's or cat's age in human years three ways: the AVMA table, the 2020 epigenetic formula and the 7x rule
- Countdown calculatorDays, hours and workdays to any date and time in any time zone, with a clock ring, saved events and a private trip budget
Measure it instead
Not sure of the size?
Trace it on the satellite view. The tool measures the area and prices 40 jobs, from mulch to roofing.