DIY & Trades Calculators
Concrete, mulch, paint, tile, carpet: material calculators that tell you exactly how much to order, with the waste factor the pros use.
Electrical & Power 6
- Ohms Law CalculatorThe full power wheel: any two of volts, amps, ohms and watts.
- Watts to Amps CalculatorWatts and amps both ways, with power factor taken seriously.
- Voltage Drop CalculatorVoltage drop, max run length, and the wire size that actually passes.
- Resistor Color Code CalculatorDecode any resistor, and catch the band you misread.
- Generator Size CalculatorA specific wattage and size class, with the starting surge counted the right way.
- BTU CalculatorRight-size an AC or heater from room size, insulation, sun, and climate.
Materials & Quantities 8
- Concrete CalculatorCubic yards and bag counts for slabs, footings, and columns.
- Mulch CalculatorYards and bags of mulch at your depth, plus bags-vs-bulk cost.
- Soil CalculatorCubic yards, bag counts, and weight for topsoil and garden soil.
- Paint CalculatorGallons and quarts of paint for any room, doors and windows deducted.
- Tile CalculatorHow many tiles and boxes to buy, with the right waste factor for your layout.
- Carpet CalculatorCarpet in sq ft and sq yd with waste and cost, or a carpet tile count.
- Board Foot CalculatorBoard feet and cost from thickness, width, length, and quantity.
- Roofing Cost CalculatorInstalled-cost range for a new roof by material, pitch, and tear-off.
Space & Sizing 6
- Square Footage CalculatorAdd up to three shapes, get total area and project cost.
- Pool Volume CalculatorGallons to fill your pool, plus hose fill time and water cost.
- Stair CalculatorRisers, riser height, total run, and stringer length, IRC code-checked.
- Storage Unit Size CalculatorOne specific unit size for your stuff, with what a walkway costs you in space.
- Moving Truck Size CalculatorOne specific truck size, sized on payload as well as cubic feet.
- Dumpster Size CalculatorA specific dumpster size for your project, plus the weight limit nobody mentions.
Services & Events 3
- Tent Size CalculatorA real rental tent size for your guest count, dance floor and bar space included.
- Porta Potty CalculatorA real number of portable toilets for your event, plus ADA units and hand wash stations.
- Pressure Washing CalculatorWhat a pressure washing job really pays, and what a fair quote looks like.
More tools 3
Which material calculator do you need?
- Floors. tile and carpet, both starting from the room area the square footage calculator gives you.
- Walls and ceilings. The paint calculator works in gallons and accounts for coats.
- Ground and garden. concrete in cubic yards, plus mulch and soil by depth.
- Structure and timber. board feet for lumber pricing, the stair calculator for rise and run, and the roofing cost estimator for a project-level figure.
- Water and air. pool volume for chemical dosing, and the BTU calculator for sizing heating or cooling to a room.
Order more than you calculate
Every material calculation here gives you the amount the geometry requires. That is not the amount to buy. Tiles break, cuts waste material, carpet has to be laid in one direction, and a bag of concrete that comes up half a bag short at the end of a pour is a genuinely bad afternoon. The trade convention is a waste factor of roughly 10 percent for straightforward rectangular work and 15 percent or more for diagonal layouts, patterned tile, or a room with awkward angles.
Our calculators state the waste factor they applied rather than hiding it inside the total, so you can raise it if your room is complicated or lower it if you are confident and the material is expensive.
Measure the space, not the plan
Rooms are rarely square, and older houses are rarely close. Measure each wall rather than assuming the opposite one matches, and measure at floor level where the material is going, not at waist height. For anything sold by volume, depth is the number people get wrong: mulch at two inches and mulch at four inches are the same area and twice the order.
One more honest note. These tools price and quantify material. They do not know your local disposal fees, delivery minimums, or whether the job needs a permit, and every cost estimator here is a range built on stated assumptions rather than a quote from a supplier who has seen the site.
Frequently asked questions
How much extra material should I order?
Around 10 percent over the calculated amount for simple rectangular work, and 15 percent or more for diagonal layouts, patterned tile, or rooms with many angles and cuts. Our calculators tell you the waste factor they used rather than folding it silently into the total, so you can adjust it for your particular room.
Why does my concrete order seem so large?
Concrete is sold by volume, so depth drives the total as hard as area does. A slab four inches deep needs a third more concrete than one three inches deep over the same footprint. Check the depth figure first, then confirm whether your supplier sells by cubic yard or by bag, because the mental arithmetic differs a lot between the two.
Are the cost estimators actual quotes?
No, and they should not be treated as one. They are ranges built from typical material and labour costs with the assumptions stated on the page. Local prices, disposal fees, delivery minimums, site access, and permits all move the real number, and only a supplier who has seen the job can give you a quote.
Do I measure the floor or the plan?
The floor, at floor level, wall by wall. Rooms are seldom truly square and older houses are often well out, so measuring one wall and assuming its opposite matches is a common way to come up short. For volume materials, measure the depth you actually intend to fill rather than the depth you hope will do.