Contractor calculators for the job site
Turn field measurements into purchase quantities, rough out remodeling budgets from your own allowances, and price the business side of contracting — from job estimates and labor burden to the revenue you need to break even.
Concrete & Foundations
Start with the footprint and thickness, then estimate the pour, base material, and reinforcement separately. Use the approved plans for footing dimensions and steel spacing; these tools estimate quantities, not structural adequacy.
Example: a 20 × 10 ft slab at 4 in thick needs 200 × (4 ÷ 12) ÷ 27 = 2.47 yd³ before waste, or 2.72 yd³ with 10% extra. Confirm delivery increments with the concrete supplier.
- Measure the slab footprint with the square footage calculator
Break irregular footprints into measurable areas before estimating volume.
- Estimate concrete volume from slab dimensions
Calculate the base volume, then add placement losses and check delivery increments separately.
- Estimate gravel for the compacted slab base
Calculate the base separately; check compaction and supplier density assumptions.
- Estimate rebar lengths and pieces from the specified spacing
Follow the reinforcement schedule and verify laps, cover, and ordering lengths.
- Read the concrete takeoff and waste planning guide
Learn why volume, delivery rounding, and base preparation need separate checks.
Roofing & Exterior
Move from horizontal footprint to sloped roof area before counting shingles. Estimate siding and insulation from their own surfaces, then plan decking and fencing as separate exterior scopes. Verify openings, laps, trim, and package coverage before ordering.
Example: a simple roof with a 1,000 ft² horizontal projection and 6:12 pitch has about 1,118 ft² of sloped area. With 10% waste, plan about 1,230 ft², or 12.30 roofing squares, before package rounding.
- Convert roof footprint and pitch into roofing quantities
Include overhangs and waste; verify the default bundle and roll coverage with your supplier.
- Estimate siding coverage and material quantities
Measure exterior walls and review openings and product coverage.
- Estimate insulation coverage for walls and roof spaces
Use the area being insulated; product thickness and code compliance still require separate review.
- Estimate deck boards for an exterior deck
Check board widths, gaps, cuts, and the chosen waste allowance.
- Estimate fence posts, rails, and pickets
Plan fence runs separately from roof and wall materials.
- Read the roof pitch, coverage, and exterior takeoff guide
Understand slope, roofing squares, and product-specific purchasing checks.
- Read how insulation relates to home heating and cooling costs
Compare energy improvements without treating material quantities as guaranteed savings.
Remodeling & Job Estimating
Define the scope first, measure each material, and price labor from your own crew assumptions. Build a room budget using local quotes, then track approved changes and billing separately. Contingency is not profit, and markup is not the same as margin.
Example: $8,000 of materials plus $5,000 of labor gives $13,000 in direct costs. A 10% contingency adds $1,300; applying 20% markup to $14,300 gives a $17,160 quote. A 20% markup is a 16.67% margin, not a 20% margin.
- Estimate drywall sheets before pricing a room remodel
Measure walls and ceilings and review sheet sizes and waste.
- Estimate flooring area and purchase quantities
Allow for layout cuts and round to the supplier's package sizes.
- Build a kitchen remodeling budget from your allowances
Price cabinetry, surfaces, labor, and other scope items with real local quotes.
- Build a bathroom remodeling budget from your allowances
Separate fixtures, finishes, and labor before adding contingency.
- Estimate crew labor cost for the planned work
Use crew size, hours, and your own hourly cost assumptions.
- Turn material and labor costs into a job estimate
Review direct costs, contingency, and markup before issuing a quote.
- Price an approved change to the project scope
Keep added or removed work distinct from the original estimate.
- Calculate progress billing for completed work
Review contract value, completion, prior payments, and retainage.
- Read the guide to scope, contingency, and job pricing
Follow a worked estimate and understand the limits of planning figures.
Calculators in this collection
- Construction Estimate Calculator
Build a job price from costs, overhead, tax, and markup.
- Square Footage Calculator
Find rectangular room, floor, wall, or project area.
- Concrete Calculator
Estimate cubic yards of concrete.
- Gravel Calculator
Estimate yards and tons of gravel.
- Flooring Calculator
Find square footage plus waste.
- Labor Burden Calculator
Turn an hourly wage into a loaded employer labor cost.
- Crew Labor Cost Calculator
Price a crew from headcount, hourly pay, burden, and hours.
- Change Order Calculator
Price added work with cost, markup, tax, and a revised contract.
- Progress Invoice / Retainage Calculator
Calculate a current draw, retainage, prior payments, and balance due.
- Roofing Shingle Calculator
Turn a roof footprint into squares, shingle bundles, and underlayment rolls.
- Drywall Sheet Calculator
Count 4×8 sheets, tape, and joint compound for a room.
- Wall Framing Calculator
Count studs and plate boards for a framed wall.
- Board Foot Calculator
Convert lumber dimensions into board feet and total cost.
- Insulation Calculator
Count insulation rolls or bags for an area and target R-value.
- Siding Calculator
Get net wall area, siding squares, and panel counts.
- Decking Calculator
Count deck boards and joists for a rectangular deck.
- Fence Calculator
Count fence posts, panels, rails, and concrete bags.
- Rebar Calculator
Count grid rebar runs, total length, weight, and bars to buy.
- Demolition Debris Calculator
Estimate debris volume, weight, and a dumpster size.
- Stair Calculator
Work out risers, treads, total run, and stringer length.
- Kitchen Remodel Cost Calculator
Build a kitchen budget from your own allowances and labor.
- Bathroom Remodel Cost Calculator
Total a bathroom budget from fixtures, tile, trades, and labor.
- Basement Finishing Cost Calculator
Budget a basement finish from area, your rate, and allowances.
- Room Addition Cost Calculator
Budget an addition from shell, finish, and site-work numbers.
- Window and Door Replacement Calculator
Price out replacing windows and doors, opening by opening.
- Contractor Break-Even Calculator
Find the revenue that covers overhead, owner pay, and profit.
Frequently asked questions
Do the material calculators replace a real takeoff from plans?
No. They convert your field measurements into planning quantities using standard geometry, common package sizes, and the waste percentage you choose. Complex roofs, patterned layouts, and code requirements can change quantities, so confirm against plans and your supplier before ordering.
Where do the prices in the remodeling budget calculators come from?
Entirely from you. Each budget combines the allowances, quantities, labor amounts, contingency, and markup you enter — the calculators never fill in national averages or present any figure as a guaranteed local price. Get real local quotes before committing money.