Footing Size Calculator
Concrete footing dimensions for a load
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Footing Size Calculator is built for concrete footing dimensions for a load — fast, free, and private. Type Column Load (kips) and Soil Bearing (ksf) into Footing Size; each keystroke re-runs the math. Footing Size ties each output to its formula. Footing Size replaces guesswork. No sign-up is needed for Footing Size. The math runs on your device. Looking for footing size calculator foundation load bearing or free online footing size calculator? Footing Size covers both. Keep Footing Size bookmarked for next time. No sign-up or email — Footing Size answers as you type.
What does the Footing Size Calculator do?
Footing Size Calculator works out the footing from the Column Load and Soil Bearing, using Construction conventions. With the defaults, footing size calculator gives a footing of 5.8 ft × 5.8 ft.
- Inputs: Column Load and Soil Bearing.
- Output: the footing, alongside the figures it was derived from.
- Method: the Construction relationship between Column Load and Soil Bearing and the footing, evaluated in order.
Quick answer
footing size calculator returns a footing of 5.8 ft × 5.8 ft with the default inputs (column load of 100, soil bearing of 3).
How does the Footing Size Calculator work?
Footing Size Calculator computes the footing directly from your inputs — the Column Load and Soil Bearing feed the formula. No request leaves the page: the footing is computed locally and stays available offline.
How it works
Readers who need to show their work gravitate to Footing Size Calculator, because the output arrives with the Construction convention named and the intermediate figures left in.
Using the Footing Size Calculator
- Column Load — used in the first footing size stage, so entering it accurately beats any later refinement.
- Soil Bearing — read as written by the Construction formula — no scaling, no conversion of the number.
- The result panel on Footing Size Calculator updates with every keystroke, so read the result after each change rather than once at the end.
- If a value is a guess, run Footing Size Calculator at both ends of its range and quote the pair of footing figures rather than a single prediction.
The formula behind the result
The formula in Footing Size Calculator operates on the values exactly as entered; keeping the units shown in each label is what makes the result trustworthy.
Worked example: with column load of 100, soil bearing of 3, this footing size calculation returns Footing: 5.8 ft × 5.8 ft. The same run reports 33.3 ft² minimum.
The steps it follows:
- Area = load / bearing = 100 / 3 = 33.3 ft²
- Square footing side = √area = 5.8 ft
Understanding the result
Work upward from the step list on the footing size page and stop when the figures stop surprising you; that is the row your error is on.
Where it helps
Reach for Footing Size Calculator when the task is deciding between two quotes, comparing scenarios side by side, and working the same calculation a different way and an estimate from memory will not survive a second look.
Common mistakes
Skipping the Column Load and Soil Bearing because it looked optional is common, yet on Footing Size Calculator an empty-looking field still feeds the output.
Tip: Footing Size Calculator returns Footing: 5.8 ft × 5.8 ft at its defaults; double the Column Load (kips) and it returns Footing: 8.2 ft × 8.2 ft.
Assumptions and limitations
The footing size calculation assumes the units printed on each label; a figure carried in from elsewhere keeps its digits and inherits the wrong scale.
Why use this calculator
Because the output is recalculated rather than remembered, Footing Size Calculator never hands you a stale figure left behind by someone else.
Frequently Asked Questions
What does footing size calculator work out?
Short of doing the Construction arithmetic yourself, Footing Size Calculator is the shortest path to a figure you can defend, because every term stays visible. Because it is fast and private — Footing Size Calculator runs entirely in your browser, nothing is uploaded, and no account is needed.
How does Footing Size Calculator arrive at its answer?
The first steps are area = load / bearing = 100 / 3 = 33.3 ft², then square footing side = √area = 5.8 ft. Order of operations is explicit in the footing size page: the Column Load and Soil Bearing pass through the Construction formula in the sequence shown, so a term cannot be applied twice by accident.
What does Footing Size Calculator require before it returns a number?
Just Column Load and Soil Bearing; Footing Size Calculator reads them directly and computes the footing in the browser.
What changes when the Column Load (kips) doubles?
At the defaults Footing Size Calculator returns Footing: 5.8 ft × 5.8 ft; doubling Column Load (kips) to 200 moves it to Footing: 8.2 ft × 8.2 ft.
What is the the Footing Size Calculator number actually saying?
The main number the footing size calculator returns is the footing for your exact inputs. Fees, taxes, rounding conventions and local rules sit outside the footing size model, so the footing inherits whatever they would have changed.
When is the Footing Size Calculator most useful?
Typical uses for Footing Size Calculator include deciding between two quotes, comparing scenarios side by side, and working the same calculation a different way — anywhere the figure needs to be defensible rather than guessed. Bookmark Footing Size Calculator — after the first visit it works offline, so the result is one tap away even without a connection.
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