Guides and articles
Guides to measuring rooms, lots and materials accurately — how to handle awkward shapes, what to include, and where square-footage figures usually go wrong.
- Calculate Land Square Footage: Irregular & Corner Plots
Work out lot area for rectangular, irregular and corner plots — splitting odd shapes into triangles and trapezoids, reading a survey, and converting to acres.
- How to Calculate Square Footage for Multiple Rooms
Total a whole floor plan without double-counting — measure room by room, capture hallways and closets, split open-plan spaces, and match the total to its use.
- How to Calculate Square Footage With a Calculator
A step-by-step walkthrough for working out square footage on any calculator — including feet and inches, odd shapes, and the keystrokes that trip people up.
- Carpet Area vs. Built-Up vs. Super Built-Up Area Explained
Three different square footages describe the same home. Learn what carpet, built-up and super built-up area include — and which one you're really paying for.
- How to Convert Inches to Square Feet (Step-by-Step)
Turn inches into square feet the right way — why 144 is the number that matters, the two methods that work, and the mistake that's off by twelve.
- Feet vs. Square Feet: Why You Can't Convert Them Directly
Feet measure length and square feet measure area, so there's no single conversion factor. Here's the difference — and the cases where the jump does work.
- How Big Is 1,000 Square Feet? (With Real Comparisons)
See what 1,000 square feet — and 100, 400 and 500 — actually looks like, compared to parking spaces, garages and everyday objects, plus how to picture any size.
- How to Calculate Price Per Square Foot
Work out price per square foot for homes, flooring and materials — the formula, how to compare quotes on the same basis, and what makes a rate good or bad.
- How to Calculate the Square Footage of a Circle
Find a circle's square footage with pi times the radius squared — measure across, halve for the radius, read the area. Includes a diameter-to-sq-ft table.
- How to Calculate the Square Footage of a House
Add up a whole house room by room, and understand gross living area versus total floor area — what counts, what doesn't, and why listings often disagree.
- How to Calculate the Square Footage of a Room
Measure and calculate the square footage of any room — rectangles, alcoves, closets and odd-shaped spaces — plus the mistakes that throw the number off.
- How to Calculate the Square Footage of a Triangle
Find a triangle's square footage two ways — half the base times the height, or straight from three sides when the height is awkward, unequal sides included.
- How to Calculate the Square Footage of a Wall
Measure wall square footage for paint, wallpaper or drywall — height times width, subtracting doors and windows, and handling gables and sloped ceilings.
- How Rent Per Square Foot Is Calculated (Landlord & Tenant)
Rent per square foot explained — the formula, monthly versus annual quoting, rentable versus usable area, and how to compare two spaces on a level field.
- Running Feet (RFT) to Square Feet: How It's Actually Used
What running feet means in construction, how to convert running feet to square feet with the material width, and why the two units bill so differently.
- Square Feet to Square Meters: Full Conversion Guide
Convert square feet to square meters and back — the exact factor, why it isn't 0.3048, ready-made conversion tables, and where you'll actually need it.
- The Square Footage Formula for Every Shape
The square footage formula is length × width for a rectangle — here it is for triangles, circles, trapezoids and every other shape you'll actually measure.
- Square Footage With Depth: Concrete, Mulch & Gravel Volume
Some materials sell by volume, not area. Turn square footage plus a depth into cubic feet and cubic yards for concrete, mulch, gravel and topsoil.
- What Counts as Square Footage? Basements, Garages & More
What counts in a home's square footage and what doesn't — basements, garages, bathrooms, attics and porches — and why the answer depends on who is asking.
- How to Calculate Square Footage: A Practical Guide
How to measure and calculate square footage for a room, house, wall, roof or yard — feet and inches, awkward shapes, and the mistakes to avoid.
What these guides cover
The calculators on this site answer a narrow question well: given these measurements, what is the area? These articles cover everything around that question — how to take measurements you can trust, which surfaces to include, what to do with a room that is not a rectangle, and how to turn a square footage figure into an order that arrives complete.
Most bad square footage figures come from four places, and none of them is the arithmetic. Mixing units — feet on one side, inches on the other — is the biggest, and it produces answers twelve times out. Measuring to the wrong surface comes next: interior room measurements and exterior building measurements differ by the thickness of every wall. Skipping the waste factor leaves a tiling job a box short on its last afternoon. And rounding before the final step compounds through every conversion afterwards.
Where to start
If you are measuring a space for the first time, start with the practical guide to calculating square footage, which walks through feet and inches, awkward shapes, whole houses, walls, roofs and yards in one place. From there, each shape page carries the measuring detail specific to that geometry, and the FAQ answers the questions that come up most often. If a figure arrives in the wrong unit, the unit converters turn it into the one you work in.
For the underlying math, the square footage formula for every shape is the hub, with dedicated walk-throughs for a triangle and a circle. And if a figure still feels abstract, how big is 1,000 square feet puts the common sizes next to things you can picture.