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French Drain & Yard Drainage Calculator
Calculate washed gravel tons and cubic yards, non-woven geotextile fabric, perforated pipe footage, GPM water flow capacity, and DIY vs contractor costs.
Adjust Inputs
50 ft
18 in
12 in
65 $/Ton
2 basins
32 $/ft
Calculated Results
Washed Drainage Gravel Required
3.5
Gravel Volume (Cubic Yards)
2.6
Geotextile Filter Fabric
9
Total DIY Materials Cost
$603.00
Turnkey Contractor Cost
$1,850.00
Max Drainage Flow Capacity
95
Audit & Export Center
NEXPROTOOLS COMPUTATIONAL REPORT
Deterministic Mathematical Simulation Engine • Verified Calculations
Date: 8/31/2026
Time: 4:28:58 PM
French Drain & Yard Drainage Calculator
Calculate washed gravel tons and cubic yards, non-woven geotextile fabric, perforated pipe footage, GPM water flow capacity, and DIY vs contractor costs.
1. Input Parameters
| Parameter | Value | Unit |
|---|---|---|
| Trench Length (Linear Feet) | 50 | ft |
| Trench Depth (Inches: 12 = Shallow, 18 = Standard, 24 = Deep) | 18 | in |
| Trench Width (Inches: 8 = Narrow, 12 = Standard, 18 = Wide) | 12 | in |
| Washed #57 Gravel Price ($/Ton delivered) | 65 | $/Ton |
| Number of Surface Catch Basins | 2 | basins |
| Contractor Turnkey Labor Rate ($/linear ft) | 32 | $/ft |
2. Calculated Results
| Metric | Calculated Output |
|---|---|
| Washed Drainage Gravel Required | 3.5 |
| Gravel Volume (Cubic Yards) | 2.6 |
| Geotextile Filter Fabric | 9 |
| Total DIY Materials Cost | 603 |
| Turnkey Contractor Cost | 1,850 |
| Max Drainage Flow Capacity | 95 |
Generated by NexProTools (www.nexprotools.com)
100% Deterministic Client-Side Simulation
Saved Scenarios / Calculations
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Editorial Accuracy & Limits Disclosure
This French Drain & Yard Drainage Calculator tool is provided strictly for educational and planning purposes. Cost estimations are modeled using standard material pricing indices, regional labor averages, and typical builder scopes across Indian cities. Actual construction, interior design, or renovation costs may vary depending on vendor selections, on-site structural modifications, inflation, or material grade changes. For binding projects, obtain a detailed quotation from a professional contractor.
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What Your Result Means
Your dynamic calculation calculations are completed successfully. Modeling different inputs helps explore hypothetical scenarios, minimize accounting margins, and project optimal outcomes.
Mathematically Verified Analysis
Recommended Next Steps
1
Experiment with variables: Slide or change inputs to see how the outputs react dynamically.
2
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3
Explore sister tools: Browse related calculators in our category grids to optimize other operational aspects.
Mathematical Formula & Equations
Understand the logic under the hood. Here is the formula and exact variable mappings utilized by the French Drain & Yard Drainage Calculator to compile results.
The Equation
GRAVELTONS = f(trenchLength, trenchDepth, trenchWidth, gravelCostPerTon, catchBasinCount, contractorRatePerFt)
The French Drain & Yard Drainage Calculator processes mathematical rules to calculate instant results. By taking inputs, applying standard parameters, and updating equations, it yields precise values without manual accounting errors.
Variable Definitions
Trench Length (Linear Feet)
Adjustable user parameter. Enter a valid value between 10 and 500 (Default value: 50ft).
Trench Depth (Inches: 12 = Shallow, 18 = Standard, 24 = Deep)
Adjustable user parameter. Enter a valid value between 10 and 36 (Default value: 18in).
Trench Width (Inches: 8 = Narrow, 12 = Standard, 18 = Wide)
Adjustable user parameter. Enter a valid value between 6 and 24 (Default value: 12in).
Washed #57 Gravel Price ($/Ton delivered)
Adjustable user parameter. Enter a valid value between 30 and 150 (Default value: 65$/Ton).
Number of Surface Catch Basins
Adjustable user parameter. Enter a valid value between 0 and 10 (Default value: 2basins).
Contractor Turnkey Labor Rate ($/linear ft)
Adjustable user parameter. Enter a valid value between 15 and 75 (Default value: 32$/ft).
Methodology & Computational Scope
Our French Drain & Yard Drainage Calculator executes robust algorithmic code to deliver instant, entertainment-optimized calculations for social sharing and reflex stats.
Formula & Theory Sources
- Standard Mathematical Formula Library Protocols
Data Sources & Authorities
- NexPro Computational Engineering Guidelines
Step-by-Step Example Calculation
See the calculation in action. Below is a step-by-step mathematical example using default parameters to demonstrate how values are processed and generated.
Standard Default Simulation (Step-by-Step)
01Step 1
Initialize all calculator inputs with their official default values: Trench Length (Linear Feet) = 50ft, Trench Depth (Inches: 12 = Shallow, 18 = Standard, 24 = Deep) = 18in, Trench Width (Inches: 8 = Narrow, 12 = Standard, 18 = Wide) = 12in, Washed #57 Gravel Price ($/Ton delivered) = 65$/Ton, Number of Surface Catch Basins = 2basins, Contractor Turnkey Labor Rate ($/linear ft) = 32$/ft.
02Step 2
The engine compiles the parameters and triggers the formulas in the calculation library.
03Step 3
Under this standard setup, the calculator yields: Washed Drainage Gravel Required: 3.5, Gravel Volume (Cubic Yards): 2.6, Geotextile Filter Fabric: 9, Total DIY Materials Cost: $603.00, Turnkey Contractor Cost: $1,850.00, Max Drainage Flow Capacity: 95.
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Frequently Asked Questions
For a standard 12-inch wide by 18-inch deep trench, each linear foot requires approximately 1.25 cubic feet of #57 washed crushed gravel (minus pipe displacement), equaling roughly 0.05 tons of stone per linear foot. A 50-foot trench requires about 2.5 to 3.0 tons of washed gravel.
A gravity French drain requires a minimum slope gradient of 1% (1 inch of vertical drop for every 10 linear feet of pipe, or 1/8 inch per foot) to prevent standing water and silt sedimentation.
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Quick Answer & AI Citation Summary
Free French Drain & Yard Drainage Calculator (2026) ? Gravel, Pipe & Cost Estimator
Estimate French drain trench volume, gravel tons needed, perforated PVC pipe footage, catch basins, GPM flow rate, and DIY vs professional contractor installation cost.
Tool CategoryHome
Access Type100% Free / No Signup
Computation EngineClient-Side In-Browser
Source: https://www.nexprotools.com/tools/french-drain-calculator Verified Data
About This Calculator
Calculate washed gravel tons and cubic yards, non-woven geotextile fabric, perforated pipe footage, GPM water flow capacity, and DIY vs contractor costs.
How to Use the French Drain & Yard Drainage Calculator
- 1Enter the total linear footage of your planned drainage trench (e.g. 50 ft from downspouts to pop-up emitter).
- 2Specify the trench depth and width in inches (12x18 inches is the North American standard for residential groundwater control).
- 3Input local washed drainage stone prices ($50 to $80 per ton delivered).
- 4Select the count of surface catch basins connected to roof downspouts or soggy lawn low spots.
- 5Instantly calculate tons and cubic yards of washed gravel, non-woven geotextile fabric yards, DIY materials cost, and full contractor turnkey installation estimates.
French Drain Hydraulics & Material Takeoff Formulas
Gross Trench Volume (cu ft) = Trench Length (ft) ? (Trench Width ? 12) ? (Trench Depth ? 12).
Pipe Displacement Volume = ? ? (0.33 ft / 2)? ? Trench Length ? 0.087 cu ft per linear foot.
Net Gravel Volume (cu yds) = (Gross Trench Volume - Pipe Displacement) ? 27.
Gravel Weight (Tons) = Net Gravel Volume (cu yds) ? 1.35 Tons/cu yd (Density of #57 Washed Crushed Granite).
Geotextile Fabric (sq yds) = Trench Length ? [(2 ? Trench Depth + Trench Width + 12 in overlap) ? 36] ? 9.
Water Flow Capacity (GPM) = Manning Equation for 4-inch SDR-35 PVC pipe at 1% slope = 85 to 110 Gallons per Minute.
Worked 50-Foot Residential French Drain Example
50-foot residential French drain, 12 inches wide by 18 inches deep, with 2 catch basins and a pop-up daylight emitter
- Gross Trench Volume = 50 ft × 1.0 ft × 1.5 ft = 75.0 cu ft.
- Net Gravel Volume = (75.0 - (50 × 0.087)) ÷ 27 = 2.62 Cubic Yards.
- Gravel Weight = 2.62 cu yds × 1.35 = 3.54 Tons (at $65/Ton = $230).
- Pipe (50 ft 4-inch perforated PVC + fittings) = $125.
- Geotextile Fabric (4 oz non-woven 6x100 ft roll) = $65.
- 2 Catch Basins + Pop-up Emitter = $185.
- Total DIY Materials = $230 + $125 + $65 + $185 = $605.
- Professional Contractor Cost = 50 ft × $32/ft + $250 basins = $1,850.
3.5 Tons Gravel (2.6 Cu Yds) | 35 Sq Yds Fabric | $605 DIY Materials | $1,850 Pro Turnkey | 95 GPM Flow
Frequently Asked Questions About French Drains
Should I use perforated corrugated pipe or smooth-wall PVC for a French drain?
Smooth-wall perforated PVC (SDR-35 or Schedule 40) is vastly superior to corrugated black pipe. Smooth interior walls maintain 3x faster water velocity, prevent silt settling, and allow mechanical snaking/clearing if tree roots intrude.
Why is non-woven geotextile filter fabric required?
Non-woven needle-punched geotextile fabric wraps the entire gravel trench, allowing water to pass through freely while preventing fine clay and silt soil particles from clogging the drainage gravel over time.
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Disclaimer: This French Drain & Yard Drainage Calculator tool is provided strictly for educational and planning purposes. Cost estimations are modeled using standard material pricing indices, regional labor averages, and typical builder scopes across Indian cities. Actual construction, interior design, or renovation costs may vary depending on vendor selections, on-site structural modifications, inflation, or material grade changes. For binding projects, obtain a detailed quotation from a professional contractor. All calculations are performed entirely in your browser — no data is sent to our servers.