ProjectCalcBUILT FOR THE JOB.

Measure & convert

Area / Volume Calculator

Turn field measurements into square feet, square meters, cubic feet, cubic yards and cubic meters. Use simple shapes to break down irregular projects.

Imperial + metricFraction-friendly inputsFree · No loginSee the math ↓

Project measurements

01 / INPUTS

Mix units freely: 8 ft, 100 mm, or 5' 7 1/2". Unmarked dimensions use the selected unit.

View live estimate ↓
For triangles, use perpendicular height. Not used for circles.
Applied before rounding purchase quantities.

Your estimate

LIVE RESULT
Surface area
120ft²
Net area · allowance applies to volume only
Surface area11.15 m²
Net volume40 ft³
Net volume1.481 yd³
Net volume1.1327 m³

Purchase / material list

Volume with allowance1.63 yd³
Volume with allowance1.2459 m³

No account. Calculations stay in your browser.

Before you order

  • Triangle width means perpendicular height; circle length means diameter. Depth is uniform.
  • Area is not increased by the volume waste allowance. Divide irregular sites into simple shapes and add their results.

UNDERSTAND YOUR ESTIMATE

How to use the area / volume calculator

Area describes a surface; volume adds a third dimension. Choose a shape, then enter length or diameter, width or perpendicular triangle height, and depth. For an irregular site, divide it into non-overlapping rectangles, circles or triangles, calculate each part and sum the results.

Formula

Rectangle area = length × width
Circle area = π × (diameter ÷ 2)²
Triangle area = base × perpendicular height ÷ 2
Volume = area × uniform depth

Assumptions & scope

  • Circle input is diameter, not radius. Triangle height must be perpendicular to its base.
  • Depth is constant across the shape. Slopes, tapered sections and irregular excavation need additional geometry.
  • Allowance affects the reported order volume only. Surface area and net volume remain the measured values.
ON THE JOB / WORKED EXAMPLE

A calculation you can check

A 10 ft × 12 ft rectangle has 120 ft² of area. At 6 in deep, it contains 60 ft³ or 2.222 yd³. With 10% allowance the volume becomes 66 ft³, or 2.444 yd³; the area remains 120 ft².

Quick reference

Area / Volume Calculator reference values
QuantityEquivalent
1 square yard9 square feet
1 cubic yard27 cubic feet
1 square meterAbout 10.7639 square feet
1 cubic meterAbout 1.3080 cubic yards

Calculation methodology

Analytical geometry with international-foot conversions. No intermediate dimension rounding is applied; displayed precision does not change the internal result.

Length conversions use the NIST SI conversion factors. See our calculation and editorial standards for precision, validation and limitations.

Common questions

Can I mix feet and inches in one calculation?

Yes. Add an explicit unit to a measurement, such as 12 ft or 4 in. Feet-and-inches expressions such as 5' 7 1/2" also work. Unmarked values use the selected input unit.

Why does changing depth not change area?

Area uses two dimensions only. Depth changes volume, the amount of three-dimensional space.

How do I measure a triangle?

Enter the base and the perpendicular distance from that base to the opposite vertex. A sloping side length is not the triangle height.