Drainage & Earthworks
Cut and Fill Calculator
Calculates cut and fill volumes for site grading
Updated May 13, 2026 · Live
What this tool does
Calculates cut and fill volumes for site grading.
Formula Used
People also use
How the cut and fill calculator works
Calculates cut and fill volumes for site grading. The calculator takes your dimensions and supplier rates, applies a standard US construction formula, and returns a quantity with an indicative cost. Every figure is an estimate — site conditions always move the final number.
Typical US drainage and earthworks wastage
Excavated soil bulks up 15–35% when lifted, so dumpster capacity fills faster than the in-place volume suggests. Plan a 1.25× swell factor when sizing haul-off. Our defaults reflect common US trade allowances, and can be adjusted upwards for non-standard geometry or downwards where experience supports a lower figure.
What this tool does not do
It does not replace a professional quote, factor regional pricing, assess structural adequacy, or confirm building code compliance. Those remain the responsibility of a suitably qualified designer, engineer, or your local building official.
On-site considerations for cut and fill
Excavations over 4 ft deep need shoring, sloping, or benching per OSHA 1926 Subpart P. Call 811 (Dig Safely) at least 48–72 hours before any excavation to mark utilities.
Codes and compliance
Foul and storm drainage follows the IPC and local stormwater rules; many jurisdictions require permits for tie-ins to public sewer or storm drains. Dry wells (drywells) need a perc test to size correctly. When in doubt, file a pre-application question with your local building department — early clarity is cheaper than a corrective inspection.
Before you order
Buy SDR-35 or Schedule 40 PVC drain pipe in standard 10 ft or 20 ft lengths with gasketed bell joints. Cutting short pieces on site wastes material and fittings. Cross-checking the calculator’s output against a supplier quote helps catch differences in pricing assumptions — ask for exact product specifications (grade, finish, batch number) and confirm delivery timescales against your programme.
Adjusting the defaults
Every input in this calculator is editable. Enter your own dimensions, supplier prices, and wastage allowance — the output recalculates instantly. If the defaults feel off for your region or project type, your own numbers always override them.
Using this cut and fill calculator alongside other BuildMetricLab tools
This calculator works best as part of a planning workflow. Pair the quantity with our project contingency, labor-hours, and material-cost calculators to build a complete estimate before you pick up the phone to a supplier. All BuildMetricLab tools run entirely in your browser — no sign-up, no data sent anywhere, and every formula is shown on-page so you can audit the math.
Sources & methodology
This tool computes adjusted earthwork volumes by applying a bulking factor to the raw cut volume (Adjusted Cut = Cut_yd³ × Bulking Factor) and a shrinkage factor to the raw fill volume (Adjusted Fill = Fill_yd³ ÷ Shrinkage Factor), then calculates the net balance as Adjusted Cut minus Adjusted Fill. A positive net result indicates a surplus requiring haul-away; a negative net result indicates a deficit requiring borrow material. Cut and fill volumes are entered directly by the user rather than derived from survey grid data, so the tool assumes those input volumes already reflect site conditions.
Frequently asked questions
Are cut and fill calculator results accurate enough to order materials?
Use them as a starting estimate only. Verifying the final quantity with your supplier or contractor before ordering is good practice — site conditions, wastage and cut-offs all affect the true figure.
What wastage percentage should I use?
The calculator defaults to the typical US trade allowance for drainage & earthworks. Increase it for complex cuts, awkward shapes, or first-time DIY. The default wastage allowance reflects common trade practice; values lower than the default may underestimate offcuts.
Does this replace professional advice?
No. This tool is a planning estimator. For work that affects structure, building code compliance, gas, electrical, plumbing, or drainage to a public sewer, consult a licensed contractor or design professional.
Can I change the unit prices?
Yes — every price field is editable. Plug in your supplier's quote to get a total that matches your project.
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