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User-designed French drain takeoff

French Drain Material Calculator

Calculate material quantities from dimensions and exact products you already selected for an ordinary French drain layout.

Enter the designed material group

Read the planned layout

Record quantities from a layout you already selected.

This schematic is an input checklist, not a drainage design. Measure each homogeneous run, then document the exact products used for that material group.

1. Runs

Split at a fitting or any change in the already-designed layout.

2. Envelope

Use the selected gravel width and height for every run in this group.

3. Products

Record actual pipe OD, stock, fittings, fabric, and supplier facts.

MATERIAL CROSS-SECTIONDIMENSIONS ONLY · NOT TO SCALEPIPE ODGRAVEL-ENVELOPE WIDTHENVELOPE HEIGHTFabric, pipe, and fittings are recorded separately.

User-designed yard-drain takeoff

Enter measured runs and exact products

Split runs wherever a fitting, envelope, pipe, or design changes. These inputs carry no hydraulic or suitability meaning.

01Trench segments

0 of 200 runs

One material group supports no more than 200 straight runs.

No designed trench segments entered.

02Scope, gravel envelope, and pipe

One homogeneous material group; not necessarily the excavation width
Start another calculation if the envelope changes
Do not enter nominal or inside diameter

03Gravel purchasing

Use 1 unless an exact supplier source documents another conversion
The label declares the exact price basis; display conversions do not change it.

04Pipe and fittings

04BUser-selected fittings

No fitting, adapter, or cleanout purchase lines entered.

05Open-ended rectangular fabric wrap

Prefabricated drain-bundle takeoff is outside this calculator's supported scope

A product-neutral bundle model cannot establish effective installed coverage, included pipe or filter components, connector requirements, cutting permission, or residual reuse. This calculator will not infer those facts.

Runs in this browser; your measurements are not uploaded.

One homogeneous group

All runs share one envelope, pipe OD/product, and fabric product. Start another calculation when any of those change.

Documented purchase evidence

Supplier conversions, density basis, package volume, stock, joints, fittings, and fabric remain reviewable.

No drainage design

No flow, rainfall, slope, outlet, discharge, excavation, suitability, or engineered application decision is made.

What this release supports

Up to 200 straight runs in one homogeneous material group, an explicit gross-envelope or modeled OD-cylinder gravel policy, documented supplier volume/mass/package data, fixed pipe sections or reusable stock, user-selected fittings, and an open-ended rectangular fabric wrap.

Conservative product boundaries

Separate pipe couplings are inferred only from an affirmative product fact. Fabric roll-width slitting is never assumed without exact-product permission. Prefabricated drain-bundle takeoffs are outside this calculator's supported scope.

Important limits

Start another calculation when the envelope, pipe product or outside diameter, or fabric product changes. Hydraulic design, outlet selection, excavation work, proprietary-system equivalence, and suitability recommendations are not part of this release.

Five checked numerical examples

These documented scenarios use repeatable inputs so you can compare the displayed quantities with the published methodology. They do not approve a project design or product selection.

  1. 50 foot designed trench: 142 gravel bags, 5 pipe sections, 4 affirmed straight couplings, and 1 fabric roll.
  2. Two measured segments: 30 plus 20 feet produces 5 pipe sections, 3 couplings, and 3 selected fabric rolls.
  3. 12 foot short run: The entered envelope, pipe diameter, and bag yield produce 22 whole gravel bags.
  4. Reusable pipe coil: A 35 plus 25 foot route uses one 100 foot coil, no straight couplings, and leaves a 40 foot remnant.
  5. Gross-envelope policy: The same measured run keeps the full entered gravel-envelope volume visible instead of silently subtracting pipe displacement.

Common mistakes to avoid

  • Entering trench dimensions before route, pipe diameter, slope, outlet, and discharge have been selected by an appropriate design process.
  • Assuming pipe displacement is always subtracted instead of explicitly selecting and reviewing the gross-envelope or OD-cylinder-adjusted policy.
  • Using this takeoff for foundations, basements, retaining walls, driveways, septic work, erosion control, or application approval.

Frequently asked questions

Does this calculator design or approve the project?

No. It converts user-selected measurements and product data into a material takeoff within the limits stated above.

Can I enter metric measurements?

Yes. The calculator normalizes supported US customary and metric inputs before applying the same formulas.

Where can I inspect the arithmetic?

Use the methodology link beside this article to review variables, rounding, purchase allocation, and exclusions.

Related material calculators

Content and example calculations reviewed August 14, 2026. Verify selected products and local requirements before purchase.