Area & Volume
Square footage, cubic yards and the unit math behind every job.
Cubic Yards
Any bulk material
Convert length, width and depth into cubic yards for concrete, soil, gravel, mulch or any bulk material.
Cubic Feet
Volume of anything
Calculate cubic feet from length, width and height, and convert to cubic yards, cubic meters and gallons.
Square Footage
Rooms & floors
Calculate the square footage of a room or area from its length and width, with optional quantity for multiple rooms.
Square Yards
Carpet & flooring
Convert a length and width in feet to square yards — for carpet, flooring and landscaping orders.
Linear Feet
Flooring & trim
Convert square footage to linear feet for flooring, decking, lumber or trim — just enter the area and the width of each piece.
Pool Volume
Gallons of water
Calculate how many gallons of water your pool holds — for rectangular, round and oval pools — from the size and depth, with litres, cubic feet and fill time.
Area & Volume guides
The formulas, conversions and how-tos behind these calculators.
How to Convert Cubic Feet to Cubic Yards
Divide cubic feet by 27 to get cubic yards. Here's why, with a conversion table for common volumes.
What Is a Cubic Yard?
A cubic yard is a volume 3 feet wide, 3 feet long and 3 feet tall — 27 cubic feet. Here's how to picture it.
How Many Cubic Feet Are in a Cubic Yard?
There are exactly 27 cubic feet in a cubic yard. Here's the math, a both-ways conversion table, and why bulk materials use it.
How to Calculate Square Footage
Multiply length by width in feet to get square footage. Here's how to handle rooms, L-shapes and odd angles.
How to Convert Square Feet to Square Yards
Divide square feet by 9 to get square yards. Useful for ordering carpet, flooring and concrete by the yard.
How to Find the Square Footage of a Circle
The area of a circle is π × radius², where radius is half the diameter. A 12 ft-wide round patio is about 113 ft². Formula, worked example and a diameter chart.
How Many Square Feet Are in an Acre?
An acre is exactly 43,560 square feet — about the size of a US football field without the end zones.
How to Measure the Square Footage of a Room
Measure a room's length and width in feet and multiply them. Here's how to handle closets, L-shapes, and whole-house totals.
What Is a Linear Foot?
A linear foot is 12 inches of length measured in a straight line — width and thickness don't matter. Here's what it means and which materials are sold by it.
How to Calculate Linear Feet
Measure length in a straight line and add it up. To convert square footage to linear feet, divide the area by the board width in feet.
How to Convert Linear Feet to Square Feet
Multiply linear feet by the piece width in feet to get square feet. 200 linear feet of 6-inch boards covers 100 ft².
How to Calculate Cubic Feet
Multiply length × width × height, all in feet, to get cubic feet. For inches, multiply the three and divide by 1,728. With a conversion table.
How Many Gallons Is My Pool? (Formula + Chart by Size)
Find your pool's volume in gallons: surface area × average depth × 7.48. Formulas for rectangular, round and oval pools, a gallons-by-size chart, and a free calculator.