Square Footing Size Calculator
Ideal centricallyuniformsquarefootingsidelengthsqrt(N/qallow), selfweightalreadyinN, no frost/punching/eccentricity design. Actual independently established design/material/calibration and matched units; not a safe work instruction, code compliance or engineering approval.
Description
A square footing spreads a centered vertical force across its plan area.
A square footing spreads a centered vertical force across its plan area.1
This tool calculates a conditional side length from that force and an independently applicable uniform bearing pressure.
When to use Square Footing Size Calculator
Use this tool to calculate a conditional side length from that force and an independently applicable uniform bearing pressure.
How to use Square Footing Size Calculator and how it works
- Prepare actualTotalFoundationForce, callerIndependentlyApplicableSoilBearingPressure, with the units, conventions and assumptions below.
- Enter the required fields and run Square Footing Size Calculator.
- Read result.value using the output definitions below.
- Correct any rejected inputs and rerun; interpret the result within the stated model and its assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualTotalFoundationForce | Actual Total Foundation Force. Use the units and matching context stated in the calculation below. | number | Required; nonnegative; finite; other constraints below |
| callerIndependentlyApplicableSoilBearingPressure | Caller Independently Applicable Soil Bearing Pressure. Use the units and matching context stated in the calculation below. | number | Required; strictly positive; finite; other constraints below |
Supply nonnegative centered vertical force and positive applicable uniform bearing pressure in compatible units. Return sqrt(force/pressure) as square footing side length. Units are meters for newtons and pascals; no eccentricity, depth, shear or settlement check is performed.
squareSide=sqrt(verticalForce/bearingPressure) Apply the input ordering, units and branch conditions stated above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the calculated or selected fields below. | object |
| result.value | Conditional geometric length in the input's compatible length unit. | number |
{
"input": {
"actualTotalFoundationForce": 20,
"callerIndependentlyApplicableSoilBearingPressure": 5
},
"output": {
"result": {
"value": 2
}
}
}Limitations and assumptions
The calculation uses the supplied observations and model inputs. It does not collect measurements, select a reference population or coefficient, or establish that the model applies to the actual case. The stated branch conditions and output units remain part of the result.
All fields require explicit values. Unexpected fields, wrong types, nonfinite numbers and sparse arrays are rejected. Alignment, bounds and supported-token rules are explained above; extremely large inputs or nonfinite results can also fail. Input errors differ from successful false comparisons, unavailable-domain flags and empty match lists.
Alternative or Complementary methods
Use Mat Foundation Pressure Calculator for a complementary operation: A uniform mat-pressure estimate divides vertical force by contact area.
Use Caisson Bearing Calculator for a complementary operation: Caisson bearing depends on soil, embedment, water and loading under an independently validated method.
References
-
Square Footing Size Calculator — tool.io
Similar or alternative tools
- Mat Foundation Pressure Calculator
A uniform mat-pressure estimate divides vertical force by contact area.
- Caisson Bearing Calculator
Caisson bearing depends on soil, embedment, water and loading under an independently validated method.