Square Footage Guides
Plain-English walk-throughs that go beyond the calculator — learn the math, the measurement tricks, and the common mistakes that cost you money on flooring, paint, tile, real estate, and more.
Last updated:Who writes these? Every guide is reviewed by the FootyCalc editorial team and cites publicly available US standards (ANSI Z765 for home area, NIST conversion tables, US Census Bureau averages). Built by Richard Taylor in Juneau, AK.
Core Guides
How to Calculate Square Feet
Step-by-step for every shape with worked examples.
Square Feet Formulas
Rectangle, circle, triangle, trapezoid, L-shape formulas.
Inches & Feet to Sq Ft
Turn a feet-and-inches tape reading into clean square footage.
Sq Ft vs Linear Feet
Why flooring and trim are priced differently, and how to convert.
Sq Ft vs Cubic Feet
Area vs volume — when to use each for mulch, concrete, HVAC.
Price per Square Foot
Real-estate, flooring, and remodel cost-per-sqft made simple.
Project Guides
In-depth guides for flooring projects, new construction budgeting, and room-size research.
Measure for Flooring
How to calculate square feet for flooring — complete guide.
Build a House Cost 2026
Cost per sq ft to build a house — US regional averages.
Average Room Sizes 2026
Data report: bedroom, living room, garage dimensions.
Laminate vs Vinyl vs Hardwood
Cost per sq ft comparison with 2026 pricing.
Popular Questions
- How many square feet is a 10x10 room?
- How to calculate square feet for flooring
- How much flooring do I need for a 12x12 room?
- Square feet to square yards for carpet
- Cost per square foot to build a house (2026)
- How many gallons of paint for a 10x10 room?
Prefer a Calculator?
If you already know what you want to measure, jump straight to the tool:
- Square Footage Calculator — every shape, every unit.
- Fast SqFt Calculator — rectangle rooms only, minimum friction.
- Room Size Index — 60+ common dimensions with answers pre-computed.
- Flooring · Tile · Carpet · Paint · Roof · Cost per Sq Ft.
How We Write Guides
These aren't rewritten listicles. Every guide is structured around a five-stage reading flow:
- Set the scene — what problem are you trying to solve?
- Explain the concept — formula and definitions.
- Show a worked example — real numbers from a real project.
- Apply it — scenarios and edge cases.
- Go deeper — pitfalls, related topics, and further tools.
If you spot an error or want a topic covered, email [email protected] — corrections ship within 72 hours.