Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Gravel needed
6.67
Estimated gravel cost
$300
Total cubic feet
133
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter driveway length (ft).
- 2Enter driveway width (ft).
- 3Enter gravel depth (in).
- 4Enter price per ton ($).
- 5Read your gravel needed on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
A 20x20 gravel pad is common for a parking area or short driveway spur. This calculator defaults to that footprint with a 4-inch depth and standard gravel density, returning the tons you need to order and total material cost.
Worked example
Using the values the calculator loads with:
Inputs
- Driveway length: 20 ft
- Driveway width: 20 ft
- Gravel depth: 4 in
- Price per ton: 45 $
Results
- Gravel needed: 6.67
- Estimated gravel cost: $300
- Total cubic feet: 133
What each field means
Inputs
- Driveway length (ft)
- The driveway length used in the calculation, measured in ft. Starts at 20 ft so you have a working example on load.
- Driveway width (ft)
- The driveway width used in the calculation, measured in ft. Starts at 20 ft so you have a working example on load.
- Gravel depth (in)
- The gravel depth used in the calculation, measured in in. Starts at 4 in so you have a working example on load. Accepted range: 2–12 in.
- Price per ton ($)
- The price per ton used in the calculation, measured in $. Starts at 45 $ so you have a working example on load.
Results
- Gravel needed
- Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Estimated gravel cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total cubic feet
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How much gravel do I need for a 20x20 driveway pad?
At 4 inches deep, about 6 tons — thicker driveways bearing heavier vehicles often use 6-8 inches, which would raise this to 9-12 tons.
What type of gravel is best for a driveway?
Crushed stone like 3/4-inch minus with fines compacts well and drains better than smooth river rock, which shifts under tire weight.
Do I need multiple gravel layers?
Larger driveways often use a coarse base layer topped with a finer surface layer; this calculator estimates total volume, and you can split it across layers as needed.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). 20x20 Gravel Driveway Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/20x20-gravel-driveway-calculator
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/20x20-gravel-driveway-calculator" target="_blank" rel="noopener">20x20 Gravel Driveway Calculator — RevenueLab</a> (2026).</p>
Source: [20x20 Gravel Driveway Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/20x20-gravel-driveway-calculator) (2026).