Guides & How-Tos
The HomeCalcTool Blog
Clear, practical guides to estimating home and construction materials. Learn how to calculate concrete, gravel, paint, drywall, flooring, and insulation the right way, with less waste and fewer trips to the store.
How to Calculate Square Footage
How to calculate square footage for any room or space, including rectangles, L-shapes, circles, and triangles, then turn that number into the materials you need.
Read the guideHow Many Bags of Concrete in a Yard?
How many 80, 60, and 40 pound bags of concrete make up a cubic yard, a quick reference chart, and the point where ready-mix delivery beats mixing bags by hand.
Jul 13, 2026
How Much Gravel for a Driveway?
How to calculate gravel for a driveway, the right depth and layers to use, and how to convert cubic yards to tons so you order the correct amount the first time.
Jul 12, 2026
How Much Mulch Do I Need?
How to figure out how much mulch you need in cubic yards and bags, the right depth for beds and trees, and a coverage chart so you order the right amount once.
Jul 11, 2026
How Many Fence Posts Do I Need?
How to calculate the number of fence posts for any fence, the right post spacing to use, and how to account for corners, gates, and end posts so you order the right count.
Jul 10, 2026
What Is a Board Foot?
A board foot is how lumber is measured and priced. Learn the simple formula, see worked examples, and understand why nominal size is not the same as actual size.
Jul 9, 2026
How to Estimate Insulation for Walls
How to work out R-value, choose between batts and blown-in, and calculate how much wall insulation you need without leaving cold gaps or overpaying.
Jul 8, 2026
How Much Flooring Do I Need?
How to measure a room for flooring, why the waste factor changes with the pattern, and how to turn square footage into the number of boxes to buy.
Jul 7, 2026
Drywall Sheet Sizes Explained
The common drywall sheet sizes and thicknesses, when to use each, and how to work out how many sheets a room needs without over-ordering.
Jul 6, 2026
Paint Coverage Guide: How Much Paint Do You Need?
How far a gallon of paint really goes, why you almost always need two coats, and how to calculate the exact number of gallons for any room without over-buying.
Jul 5, 2026
Gravel vs Crushed Stone, What's the Difference?
Gravel and crushed stone are not the same material. Learn how they differ, when to use each, and how to estimate the right amount for driveways, patios, and drainage.
Jul 4, 2026
How to Calculate Concrete for a Slab
A step-by-step guide to calculating how much concrete a slab needs, in cubic yards and bags, with a worked example and the waste factor pros actually use.
Jul 2, 2026