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Every material estimate, from concrete to paint, is built from three inputs. Get one wrong and the whole estimate is wrong, which is why the calculators ask for them separately instead of hiding them behind a single box.
| Input | What it means | Common mistake |
|---|---|---|
| Measured quantity | Area, volume, length or count of the actual job | Using the room's floor area when painting the walls |
| Waste allowance | Extra material for cuts, breakage and over-pour | Forgetting it, then buying a second delivery |
| Unit price | Price per cubic yard, square, linear foot or sheet | Mixing a delivered price with a retail bag price |
Take a slab 20 feet by 20 feet at 4 inches deep. Convert the thickness to feet first: 4 inches is 0.333 feet. Volume in cubic feet is length times width times thickness, so 20 x 20 x 0.333 equals about 133 cubic feet. One cubic yard is 27 cubic feet, so the slab needs 133 divided by 27, which is about 4.9 cubic yards. Add 5% for grade variation and spillage and you order 5.2 yards.
The material cost is only one line. Finishing labour, forming, base preparation and hauling are priced separately, which is why the installed cost on the concrete guide is $6 to $15 per square foot while the concrete itself is a fraction of that.
Grouping matters because homeowners search by project, not by material. Pick the group that matches the work, then the specific calculator inside it.
| Group | Calculators | Start with |
|---|---|---|
| Concrete and masonry | Slab cost, rebar, retaining wall blocks, gravel and mulch, topsoil | Concrete calculator |
| Fencing and decks | Fence installation cost, fence stain, deck boards and joists, deck cost | Fence cost calculator |
| Roofing and exterior | Roof pitch, roof replacement, siding, gutters, windows | Roof replacement calculator |
| Interior | Drywall sheets, drywall repair, tile grout, paint, kitchen and bathroom remodel, countertop, hardwood vs LVP | Drywall sheets calculator |
| Systems | HVAC replacement, heat pump savings, electrical panel, EV charger, repipe, sprinklers | HVAC replacement calculator |
| Yard and upkeep | Sod and seed, tree removal, stump grinding, pressure washing, insulation, spray foam, termite treatment | Sod and seed calculator |
| Diagnosis | Crack width checker, garage floor coating, repair or replace | Crack width checker |
The full tool list with descriptions is on the calculators page.
Waste is not a single number. Tiles break on cuts, lumber has defects, concrete spills and paint soaks into the surface. These are the allowances the calculators use by default, and you can change them.
| Material | Typical waste | Why |
|---|---|---|
| Concrete | 5% to 10% | Grade variation and spillage; washout on the truck |
| Tile | 10% to 15% | Cut pieces, pattern matching, breakage |
| Lumber and decking | 5% to 10% | Defects, knots, cut-offs |
| Paint | One extra gallon per room | Porosity, number of coats, touch-ups |
| Fence panels and pickets | 3% to 5% | Gate framing, corners and slope |
Estimates, not quotes. Local prices and site conditions change the result.
Have the measurements? Run the calculator for the job; it shows the formula, the waste and the cost range.
Open the calculatorsThe calculators do the arithmetic, and the guides show the arithmetic step by step so you can check it by hand. These two fence examples are the first in the quantity cluster.
| Guide | Question it answers |
|---|---|
| How many fence posts do I need | Post spacing by fence type, corners and gates, with worked examples |
| How much concrete per fence post | Hole volume, bag counts by hole size and a 14-post worked example |
A calculator returns three things, and they are not the same kind of number. The quantity is exact arithmetic from your measurements. The cost is a range built from national prices. The waste allowance is a policy choice, not a measurement. Treat them differently: the quantity you can trust if the inputs are right, the cost needs a local check, and the waste is yours to adjust.
If the result looks wrong, check the units before doubting the formula. A depth entered in inches where the calculator expects feet is the most common error we see, and it changes the volume by a factor of twelve. The second most common is entering a room's floor area for a paint job that needs wall area.
| From | To | Multiply by |
|---|---|---|
| Cubic feet | Cubic yards | divide by 27 |
| Square feet | Roofing squares | divide by 100 |
| Inches | Feet | divide by 12 |
| Linear feet of board | Board feet | multiply by thickness (in) x width (in) / 12 |
| Acres | Square feet | multiply by 43,560 |
| 80 lb concrete bag | Cubic feet | about 0.6 |
Every quantity calculator asks for a depth, and the depth is often guessed. These are the thicknesses that common residential jobs are normally built to, as a starting point for the calculator rather than a substitute for a local engineer on structural work.
| Job | Typical thickness | Note |
|---|---|---|
| Garden path or stepping stones | 2 to 3 inches | Light foot traffic over a compacted base |
| Patio | 4 inches | Reinforcement is common but not universal |
| Shed floor | 4 inches | Depends on the shed and what goes inside it |
| Driveway | 5 to 6 inches | Heavier vehicles and freeze-thaw push it up |
| Garage floor | 4 to 6 inches | Check the vehicle weight and any lift |
For posts and footings the depth is set by frost line and load, which is a different calculation and is covered in the fence post concrete guide. When a number is structural, get it engineered rather than borrowed from a chart.
A calculator gives you a material quantity and a range, not a fixed price. Use it to check that a quote's material line makes sense and that the quantity is right. Labour, access and site conditions still need a contractor's eyes.
The quote includes labour, permits, disposal and a profit margin. The calculator shows material and a typical installed range. If the difference is large, compare the line items rather than the totals.
Use the calculator's default first, then raise it for complicated shapes, small rooms with many cuts, or a material that is hard to reorder. A second delivery is usually more expensive than the extra material.
The site's guides and tools use US customary units: feet, inches, square feet, cubic yards and linear feet. Convert metric measurements first; the formulas are unit-agnostic once the units match.
Four inches is the common residential patio thickness over a compacted base. Enter a different number only if the design calls for it, and remember the thickness changes the volume in direct proportion.
Material quantity can be exact, but the installed cost depends on local labour, access and site conditions. A range is honest; a single number would pretend those variables do not exist.
A roofing square is 100 square feet of roof area. Shingles are sold by the square, so a 20 square roof is 2,000 square feet of roof surface, not 2,000 square feet of floor area.
Yes. Each calculator page carries an embed option for a one-line iframe, with attribution to LocalServiceHQ. It is free and does not require an account.