kPa to psf Bearing Pressure Calculator

SettingsSettings for this calculationUS

Market

Imperial · sales tax

Bearing pressure (kPa)

The pressure in kilopascals, as written in the geotechnical report or metric load schedule.

Allowable bearing pressures for shallow foundations commonly fall between about 75 and 300 kPa in stiff clays and dense sands, and a report may write the same value as kN/m². Metric floor loading is an order of magnitude smaller — typically 1.5 to 5 kPa — so check which quantity the number describes before converting.

Bearing pressure

3,133 psf

High confidence

Converted using an exact defined factor of 20.88543423315013 psf per kPa. The digits convert; the report's allowable-versus-ultimate wording and its settlement limit do not.

Conversion factor applied: 20.89 psf per kPa

Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

1 lbf = 4.4482216152605 N exactly, from 1 lb = 0.45359237 kg and g₀ = 9.80665 m/s², both exact; 1 ft² = 0.09290304 m² exactly. So 1 kPa = 1000 × 0.09290304 ÷ 4.4482216152605 = 20.885434233150127… psf. The ratio is exact by definition and its decimal expansion repeats, so the trailing digits are the exact quotient carried out, not an estimate.

Inputs used

Bearing pressure (kPa): 150

Intermediate steps

Conversion factor applied: 20.89 psf per kPa

Final result3,132.82 psf

Confidence note: Converted using an exact defined factor of 20.88543423315013 psf per kPa. The digits convert; the report's allowable-versus-ultimate wording and its settlement limit do not.

Add the equipment this sizes

This result is a specification — 3,133 psf — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

QtyItemPrice each ($)

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-08-26 · in the site-wide review of 2026-09-06 · v1.0.0

Regulatory standards & verification citations1

1 lbf = 4.4482216152605 N exactly, from 1 lb = 0.45359237 kg and g₀ = 9.80665 m/s², both exact; 1 ft² = 0.09290304 m² exactly. So 1 kPa = 1000 × 0.09290304 ÷ 4.4482216152605 = 20.885434233150127… psf. The ratio is exact by definition and its decimal expansion repeats, so the trailing digits are the exact quotient carried out, not an estimate.

Cite this page

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

A metric geotechnical report lands on a desk where the footing schedule is worked in pounds per square foot, and 150 kPa has to become something a US spreadsheet can size a pad from — about 3,133 psf. Two things travel badly. First, the report will write kN/m² as readily as kPa; they are the same unit exactly, so that part needs no arithmetic at all. Second, the figure is qualified — allowable or ultimate, net or gross, and usually tied to a settlement limit at an assumed footing width. The conversion carries the digits and none of the qualification, so read the sentence around the number before it enters a design. And keep psf clear of psi: they differ by a factor of 144.

Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

Planning a Crane Liftuses this calculator

Capacity comes off a load chart written for a level test pad, and the ground under the outriggers has to be built to match it.

Specifying a Warehouse Floor: Flatness Class and Rack Leg Loadsuses this calculator

The slab section of a distribution unit turns on two numbers the letting brief never gives you: how the trucks travel, and what stands on one rack leg.

Working to a Data Sheet in the Other Unit System

Bearing pressure (kPa)	Bearing pressure (psf)
20	418
50	1,044
100	2,089
200	4,177
500	10,443
1,000	20,885

Bearing pressure (kPa)

Bearing pressure (psf)

418

1,044

100

2,089

200

4,177

500

10,443

1,000

20,885

Frequently asked questions

Is kN/m² the same as kPa?

Exactly the same. A kilonewton spread over a square metre is a kilopascal by definition, so 150 kN/m² and 150 kPa are one number written two ways, and both come to 3,133 psf. European and Australian geotechnical reports tend to prefer kN/m² for bearing and kPa for fluid or earth pressure, but nothing needs doing between them.

How do I get kips or tons per square foot?

Divide the psf result by 1,000 for kips per square foot: 150 kPa is 3,133 psf, so 3.13 ksf. For US short tons per square foot, divide by 2,000 instead — about 1.57 tsf. Older US foundation reports and presumptive bearing tables often quote tsf, so check which the receiving spreadsheet expects.

Can I convert to psi instead?

Only after dividing by 144, since a square foot holds 144 square inches exactly. 150 kPa is 3,133 psf but only 21.8 psi. Foundation bearing and floor loading are conventionally quoted in psf; psi belongs to concrete strength, hydraulic pressure and fastener bearing, and mixing the two understates a bearing pressure by more than two orders of magnitude.

Does a converted allowable bearing pressure still need checking?

Yes. An allowable value in a report is normally tied to an assumed footing width and a settlement limit, and it may be a net pressure rather than gross — meaning the soil removed during excavation has already been credited. None of that survives a unit conversion, so carry the report's wording into the design alongside the converted number.