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Quickly figure out your French drain needs with our free, easy-to-use calculator. Perfect for homeowners and DIY lovers. No fuss, just simple answers.
Picture this: It’s been raining for hours. You step into your backyard, and splash! Your lawn is a soggy mess.
A French drain helps fix that. It’s a trench filled with gravel and a pipe. Water flows into it and drains away from your home or yard.
Let’s be real. Measuring and guessing isn’t fun. You don’t want to dig too deep or buy too much gravel.
That’s where our French Drain Calculator comes in. It saves time, money, and your back.
With just a few quick inputs, you’ll get:
Got a ruler or tape measure? Great! That’s all you need.
Enter:
Our calculator will do the math for you. You’ll get quick, clear results.
Let’s say your yard is 1,000 square feet and you get 1 inch of rain.
Here’s the math:
Water Volume = Area × Rain × 0.623
= 1,000 × 1 × 0.623
= 623 gallons
That’s over six bathtubs full of water!
If you don’t drain it, your lawn will turn into a swamp. A French drain clears that water fast.
For most homes, 12 to 24 inches deep is enough. Deeper drains carry more water. If your yard slopes or floods often, go deeper.
The pipe usually sits at the bottom. Gravel goes around it. A filter cloth stops soil from clogging the pipe.
| Yard Size (sq ft) | Rain (in) | Water (gallons) | Pipe Size | Depth |
|---|---|---|---|---|
| 500 | 1 | 311.5 | 4-inch | 12 in |
| 1,000 | 1 | 623 | 4-6 inch | 18 in |
| 1,500 | 2 | 1,869 | 6-inch | 24 in |
| 2,000 | 2.5 | 3,115 | 6-8 inch | 24 in |
This chart gives a ballpark idea. Use the calculator for better results.
Installing a French drain isn’t super expensive, especially if you DIY.
So, for a 50-foot drain, you might spend $500 to $1,500. Our calculator gives you a better estimate based on your inputs.
A standard 4-inch pipe can carry about 25 gallons per minute if it has a good slope.
That’s enough to handle most yard runoff. Bigger pipes carry more, but they cost more too.
Water issues can ruin your lawn, basement, or even your foundation. Don’t wait until the next storm.
With our Free French Drain Calculator, you’ll know exactly what you need. No guessing. No math headaches. Just plug in a few numbers and get a fast answer.
It’s free. It’s online. It works on your phone too.
That depends on your yard size and rainfall. Use our calculator to get a quick answer.
Yes! Many homeowners do. Just dig, lay the pipe, and cover it with gravel.
Yep. 100% free and easy to use.
Anywhere water collects. Around your home, driveway, or low spots in the yard.