Border Wall Cost Calculator
Estimate the construction cost of a US–Mexico border wall (often searched as the “Trump wall”). Enter the length in miles, the wall height, a cost per mile and a contingency for roads, technology and land, and get the base cost, the total cost with extras, the cost per foot, the footing concrete and the wall face area — with by-length and by-cost tables, a chart, and a downloadable PDF. Figures are rough planning estimates that vary widely by terrain and segment.
| Length | Base cost | Total cost | Concrete |
|---|---|---|---|
| Enter a wall to compare | |||
| Per mile | Per foot | Base cost | Total cost |
|---|---|---|---|
| Enter a wall to compare | |||
How to use the border wall cost calculator
Four quick steps turn a wall length and cost basis into a build estimate — the base cost, the total with contingency, the cost per foot, and material side-estimates for concrete and wall face area. Often searched as the “Trump wall” calculator.
Enter the length
How many miles of wall to build — a segment or the full border.
Set the cost basis
An all-in cost per mile and a contingency percentage for extras.
Add height & footing
The wall height and the concrete footing width and depth.
Read results & save a PDF
Get the base, total, per-foot and materials — then download a report.
The formulas behind the estimate
The cost is simple multiplication: miles times cost per mile, plus a contingency. The materials follow from the length, height and footing size.
▶ Worked example
500 miles of 30 ft wall at $20M per mile with a 20% contingency.
Base = 500 × $20M = $10.0B; total = $10.0B × 1.20 = $12.0B; cost per foot = $20M ÷ 5,280 = $3,788.
Footing (2 ft × 4 ft) = 500 × 5,280 × 2 × 4 ÷ 27 = 782,000 cu yd; face area = 500 × 5,280 × 30 = 79.2M sq ft.
Base $10.0B · total $12.0B · $3,788/ft · ~782,000 cu yd concrete
The full 1,954-mile border on the same basis would be about $46.9B.
Border wall cost quick reference
The estimate formulas, the cost by length, and the cost by price per mile — all rough planning figures.
| Quantity | Formula |
|---|---|
| Base cost | miles × cost per mile |
| Total cost | base × (1 + contingency ÷ 100) |
| Cost per foot | cost per mile ÷ 5,280 |
| Footing concrete | feet × width × depth ÷ 27 |
| Wall face area | feet × height |
| Length | Base cost | Total cost |
|---|---|---|
| 100 mi | $2.00B | $2.40B |
| 250 mi | $5.00B | $6.00B |
| 500 mi | $10.00B | $12.00B |
| 1,000 mi | $20.00B | $24.00B |
| 1,954 mi (full border) | $39.08B | $46.90B |
| Cost / mile | Base cost | Total cost |
|---|---|---|
| $10M (low) | $5.00B | $6.00B |
| $15M | $7.50B | $9.00B |
| $20M (mid) | $10.00B | $12.00B |
| $30M (high) | $15.00B | $18.00B |
| $46M | $23.00B | $27.60B |
The cost scales directly with both the length and the price per mile, so the total is very sensitive to the per-mile figure you choose. These are planning ballparks, not official budgets — real costs vary widely by terrain and materials.
Everything the calculator returns
One calculation gives the full estimate — the costs, the per-foot figure and the material side-estimates.
The estimate at a glance
The reference figures, and the default result.
Built for the way you work
Whether you are researching policy, teaching, or just curious about the numbers, the estimate starts from the same few inputs.
Need a quick, transparent cost estimate to sanity-check a quoted figure, with the inputs laid out so the math is clear.
- Enter the quoted per-mile cost
- Compare base vs total
- Cite figures as estimates
Want a real-world unit-rate problem — cost per mile, per foot, contingency and large-number scaling — to work through.
- See per-mile to per-foot
- Scale from miles to the border
- Add a contingency percentage
Have seen the headline figures and want to try your own assumptions for length, price and extras to see the total.
- Try low, mid and high costs
- Build a segment or the whole border
- Treat the output as a ballpark
Read the estimate wisely
Seven things to keep in mind when estimating a project this size.
Cost per mile drives it
The per-mile figure is the biggest lever. Over hundreds of miles, a few million dollars difference per mile moves the total by billions.
Terrain changes everything
Flat, accessible ground is far cheaper than mountains, rivers or remote land. A single per-mile number averages over very different sites.
Add a real contingency
Roads, lighting, sensors, land and design are not the wall itself. Large projects carry 15–30% on top of the base.
Per foot sanity-checks per mile
Divide the per-mile cost by 5,280. If the per-foot figure looks wild for the materials, the per-mile number probably is too.
Not all of the border is wallable
Much of the 1,954 miles is river, rugged terrain or protected land. Full-length totals are a reference, not a plan.
Footing is a side-estimate
The concrete figure shows the scale of materials, but the per-mile cost already includes it — don’t add it twice.
Treat it as a ballpark
This is a planning estimate from simple inputs, not a budget or a quote. Published real-world figures disagree widely.
Frequently asked questions
Common questions about estimating border wall cost, length, contingency and materials.
A border wall cost estimate starts from three figures: the length to build in miles, an all-in cost per mile, and a contingency percentage for extras. The base cost is the miles times the cost per mile; the total adds the contingency on top.
The cost per mile is the main driver and varies widely with terrain, materials, land acquisition and labor, so the estimate is only as good as that figure. The contingency covers roads, lighting, sensors, design and overruns.
For example, 500 miles at 20 million dollars per mile with a 20 percent contingency is a 10 billion dollar base and a 12 billion dollar total. This calculator works out the base, the contingency and the total from the figures you enter.
There is no single number — published government and press figures for US border wall construction in 2017 to 2021 ranged widely, roughly 15 to 30 million dollars per mile on average, and higher in difficult terrain. The cost depends on the land, the ground, access, materials and the design height.
Because of that range, the cost per mile is an input you set rather than a fixed value, and small changes in it move the total a lot over hundreds of miles.
For example, at 500 miles, going from 15 to 30 million dollars per mile changes the base cost from 7.5 to 15 billion dollars. This calculator lets you pick a low, mid or high figure, or enter your own.
The US–Mexico border is about 1,954 miles long, running from the Pacific Ocean to the Gulf of Mexico. Not all of it is practical or legal to wall — much of it follows the Rio Grande or crosses rugged terrain and tribal or private land.
Before 2017, roughly a third of the border already had some form of barrier, so new construction figures usually refer to the remaining or replaced sections rather than the full length.
For example, the full 1,954 miles at 20 million dollars per mile with a 20 percent contingency works out to about 46.9 billion dollars. This calculator uses 1,954 miles as the full-border reference, or you can enter any segment length.
The contingency is an added percentage on top of the base wall cost to cover everything that is not the wall itself — access roads, lighting, cameras and sensors, land acquisition, design and engineering, and cost overruns. Large infrastructure projects routinely carry 15 to 30 percent for these.
It is applied to the base cost, so a 20 percent contingency multiplies the base by 1.2. The bigger and more uncertain the project, the higher the contingency usually is.
For example, a 10 billion dollar base with a 20 percent contingency adds 2 billion dollars, for a 12 billion dollar total. This calculator lets you set any contingency percentage.
Since a mile is 5,280 feet, you divide the cost per mile by 5,280 to get the cost per foot. It is a handy way to sanity-check a per-mile figure against the size and materials of the wall.
The per-foot cost does not depend on how many miles you build — it is just the per-mile cost spread over the feet in a mile.
For example, 20 million dollars per mile divided by 5,280 is about 3,788 dollars per foot. This calculator reports the cost per foot alongside the totals so you can judge whether a per-mile figure is reasonable.
A steel-bollard border wall sits on a continuous buried concrete footing, and its volume is the length times the footing width times the depth, divided by 27 to get cubic yards. A taller wall needs a deeper, wider footing to resist being pushed over or undermined.
This is a materials side-estimate — the per-mile cost already includes the footing — but it gives a sense of the sheer quantity of concrete involved.
For example, 500 miles of wall on a 2-foot-wide, 4-foot-deep footing is about 782,000 cubic yards of concrete. This calculator estimates the footing concrete from the length and footing dimensions you enter.
Recent US border bollard fencing was built mostly at 18 to 30 feet, with 30 feet the standard design height for new construction in 2017 to 2021. Earlier barriers were often lower, and the height varies by location and purpose.
The height sets the wall face area — the length times the height — which matters for materials and for the visual scale, though the per-mile cost is the main cost driver rather than height alone.
For example, 500 miles at 30 feet tall is about 79.2 million square feet of wall face, roughly 1,818 acres. This calculator includes 18, 24 and 30 foot heights and reports the face area.
They are rough planning estimates, not official numbers. Real border wall costs vary enormously with terrain, materials, land acquisition, labor and how much existing barrier is replaced, and published figures themselves disagree. The calculator multiplies simple inputs, so the result is only as good as the cost per mile you choose.
Treat the output as a ballpark for comparison and discussion, not a budget or a quote. The preset per-mile figures are drawn from the wide range in government and press reports, which is why they span low, mid and high.
For example, the same 500 miles can total anywhere from about 6 to 28 billion dollars depending on the per-mile cost and contingency. This calculator is a planning aid for exploring those scenarios, not an authoritative cost.
Disclaimer: US units, rough planning estimates only. Base cost = miles × cost per mile; total = base × (1 + contingency ÷ 100); cost per foot = cost per mile ÷ 5,280; footing concrete = length(ft) × width × depth ÷ 27 cubic yards; wall face area = length(ft) × height. The preset per-mile costs (~$15–30M) and the ~1,954-mile border length are drawn from government and press reports that vary widely; real costs depend heavily on terrain, materials, land acquisition and labor. This is a neutral arithmetic tool, not a budget, quote or political statement — treat the output as a ballpark for discussion, and verify any figure against primary sources.