Yard & Slab — Jobsite Material Estimate

Precision US Contractor & Building Material Calculations (yardandslab.com)

Date: October 28, 2026

Standards: US Imperial (ASTM / Quikrete / IRC)

100% US Imperial Standard: All formulas calibrated for US Retail SKUs (80lb/60lb Bags, Cubic Yards, US Tons & Gallons)
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French Drain Gravel & Pipe Displacement Calculator

Calculate gravel, pipe displacement, and geotextile fabric for French drain installations. Subtracts exact 4" or 6" pipe volume.

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💧 French Drain Trench Dimensions

100 ft
10 ft 150 ft 300 ft
ℹ️ Pipe Displacement Accounted For: A 4" corrugated pipe displaces ~10.085 cu ft of gravel. We subtract this volume to prevent you from overpaying for stone.
Net Drainage Stone Needed

7.25 tons (#57 Washed Gravel)

Net Gravel Volume

5.18 cu yd

Gross: 150 cu ft

Pipe Displacement: -10.085 cu ft Fabric Width: 64" wide roll Total Fabric: ~586.7 sq ft

French Drain Cross-Section (Burrito Wrap)

12"W × 18"D
Lawn Grade Lawn Grade Geotextile Overlap (64" roll) 4" Pipe 2" Stone Bedding 12" Trench Width 18" Trench Depth

🛒 Drainage Material Shopping List

#57 Washed Drainage Gravel 1.4 tons/yd³ bulk density
7.25 tons (5.18 cu yd net)
4" Corrugated Perforated Pipe Slotted drain pipe with sock or bare
1 coil(s) (100') Check Home Depot ›
Non-Woven Geotextile Fabric 4 oz/yd² needle-punched (no slit woven)
64" wide roll Check Amazon ›
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Digging a 100' trench by hand takes 18+ hours.

Connect with local drainage contractors with mini-excavators to trench, pipe, and backfill in 1 day.

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📐 Engineering Principles & Formulas

All calculations adhere strictly to US Imperial standards and standard retail SKU yields (Quikrete, Home Depot, Lowe's, ASTM standards):

• Gross Trench Volume (cu ft) = Length (ft) × [Width (in) ÷ 12] × [Depth (in) ÷ 12] • 4" Corrugated Pipe Displacement (cu ft) = π × (2.15 in ÷ 12)² × Length (ft) • Net Gravel (cu yd) = (Gross Trench Volume - Pipe Displacement) ÷ 27 • Washed Drainage Stone (Tons) = Net cu yd × 1.4 tons/cu yd (#57 stone) • Non-Woven Geotextile Fabric Width = (Width × 2) + (Depth × 2) + 4" overlap

Pre-Solved Dimension Calculators

17 Pre-Calculated Sizes

Jump directly to your exact dimensions with pre-solved material quantities and instant answers:

How Much Gravel for a 25 ft French Drain (12" × 12" Trench)? › How Much Gravel for a 25 ft French Drain (12" × 18" Trench)? › How Much Gravel for a 50 ft French Drain (12" × 12" Trench)? › How Much Gravel for a 50 ft French Drain (12" × 18" Trench)? › How Much Gravel for a 50 ft French Drain (12" × 24" Trench)? › How Much Gravel for a 75 ft French Drain (12" × 18" Trench)? › How Much Gravel for a 75 ft French Drain (18" × 24" Trench)? › How Much Gravel for a 100 ft French Drain (12" × 18" Trench)? › How Much Gravel for a 100 ft French Drain (12" × 24" Trench)? › How Much Gravel for a 100 ft French Drain (18" × 24" Trench)? › How Much Gravel for a 125 ft French Drain (12" × 18" Trench)? › How Much Gravel for a 150 ft French Drain (12" × 18" Trench)? › How Much Gravel for a 150 ft French Drain (18" × 24" Trench)? › How Much Gravel for a 200 ft French Drain (12" × 18" Trench)? › How Much Gravel for a 200 ft French Drain (12" × 24" Trench)? › How Much Gravel for a 250 ft French Drain (12" × 18" Trench)? › How Much Gravel for a 150 ft French Drain (12" × 24" Trench)? ›

🔗 Free Contractor Website Embed Widget

Contractors, builders, and suppliers can embed this interactive French Drain Gravel & Pipe Displacement Calculator on their website for free.

<iframe src="https://yardandslab.com/embed/french-drain-gravel-calculator" width="100%" height="650" frameborder="0" style="border:1px solid #e2e8f0;border-radius:12px;"></iframe>

❓ Frequently Asked Questions: French Drain Gravel & Pipe Displacement Calculator

Yes. Every calculation outputs standard US construction packaging and measurements: cubic yards, 40lb/60lb/80lb Quikrete bags, US short tons (2,000 lbs), fluid ounces, gallons, and linear feet matching Home Depot and Lowe's retail inventory.
Yes. Calculators default to a contractor-standard 10% waste factor to accommodate form flex, uneven subgrades, and spillage. You can adjust this to 5% or 15% using the interactive input controls.
Generic calculators rely on basic geometric boxes without considering physical building realities: corrugated pipe displacement in French drains, actual nominal post sizes (3.5" for 4x4, not 4.0"), 15% compaction factors for crushed aggregate, and IECC US Climate Zones.
Yes! Click the "Print / PDF" button on any calculator to generate a clean, branded one-page materials shopping list formatted for mobile or paper printout at the lumberyard.