Psi to Ksi Converter

Enter the value that you want to convert psi to ksi or ksi to psi.

1 psi = 0.0010000 ksi

Formula: ksi = psi value × 0.0010000

psi to ksi

Value

psi

Result

0.01000ksi

10 psi = 0.01000 ksi

Popular Pressure Converters:

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Converting Psi to Ksi

What is Psi?

Psi (psi) is a unit of pressure measurement. 1 psi is equal to 0.0010000 ksi.

The Ksi in Engineering

Ksi (ksi) is a unit of pressure measurement. 1 ksi is equal to 1000.0000000 psi.

Pressure Units Across Industries

Pressure measurements vary dramatically by industry. Meteorologists report in millibars or hectopascals, tire shops use PSI, scuba divers think in atmospheres or bar, vacuum engineers work in torr, and hydraulic systems specify in megapascals. A single industrial plant might encounter all these units across different equipment manuals, safety datasheets, and regulatory standards from different countries.

psi to ksi metric conversion table

0.01 psi	=	0.00001 ksi
0.1 psi	=	0.00010 ksi
1 psi	=	0.00100 ksi
2 psi	=	0.00200 ksi
3 psi	=	0.00300 ksi
4 psi	=	0.00400 ksi
5 psi	=	0.00500 ksi
6 psi	=	0.00600 ksi
7 psi	=	0.00700 ksi
8 psi	=	0.00800 ksi
9 psi	=	0.00900 ksi
10 psi	=	0.01000 ksi
11 psi	=	0.01100 ksi
12 psi	=	0.01200 ksi
13 psi	=	0.01300 ksi
14 psi	=	0.01400 ksi
15 psi	=	0.01500 ksi
16 psi	=	0.01600 ksi
17 psi	=	0.01700 ksi
18 psi	=	0.01800 ksi

19 psi	=	0.01900 ksi
20 psi	=	0.02000 ksi
30 psi	=	0.03000 ksi
40 psi	=	0.04000 ksi
50 psi	=	0.05000 ksi
60 psi	=	0.06000 ksi
70 psi	=	0.07000 ksi
80 psi	=	0.08000 ksi
90 psi	=	0.09000 ksi
100 psi	=	0.10000 ksi
200 psi	=	0.20000 ksi
300 psi	=	0.30000 ksi
400 psi	=	0.40000 ksi
500 psi	=	0.50000 ksi
600 psi	=	0.60000 ksi
700 psi	=	0.70000 ksi
800 psi	=	0.80000 ksi
900 psi	=	0.90000 ksi
1000 psi	=	1.00000 ksi

How to Convert Psi to Ksi?

We can convert psi to ksi by using an example.

Example:

Convert 20 Psi to Ksi?

We know 1 Psi = 0.0010000 ksi; 1 Ksi = 1000.0000000 psi.

20 psi = ___ksi

20 × 0.0010000 = 0.02000 ksi (we know 1 psi = 0.0010000 ksi)

Answer:

20 psi = 0.02000 ksi

How to Convert PSI to ksi (Step-by-Step)

Converting PSI to ksi (kilopounds per square inch) is straightforward since 1 ksi = 1000 PSI. This conversion is standard in structural steel engineering, high-pressure hydraulics, and material testing where values in thousands of PSI are common.

Write down the pressure or stress value in PSI.
Divide the PSI value by 1000.
The result is the equivalent value in ksi.

💡 Tip: Simply move the decimal point three places to the left. Example: 36,000 PSI = 36 ksi. This is the yield strength of A36 structural steel — the most common structural grade in US construction.

Common PSI to ksi Conversions

Structural steel grades, bolt ratings, and material specifications in PSI and ksi — the language of American structural engineering.

Psi	Ksi	Note
36,000 PSI	36 ksi	ASTM A36 steel yield strength
50,000 PSI	50 ksi	ASTM A572 Grade 50 yield
58,000 PSI	58 ksi	A36 minimum tensile strength
65,000 PSI	65 ksi	A572 Gr. 50 minimum tensile
85,000 PSI	85 ksi	Grade 5 bolt proof load
92,000 PSI	92 ksi	A325 bolt minimum tensile
120,000 PSI	120 ksi	Grade 8 / A490 bolt minimum tensile
150,000 PSI	150 ksi	A490 bolt proof load

Solved Examples: PSI to ksi

Question 1: A tensile test on a steel coupon shows ultimate failure at 72,400 PSI. Express in ksi for the mill certificate.

Solution:

Stress in ksi = 72,400 ÷ 1000

= 72.4 ksi

Answer: 72,400 PSI = 72.4 ksi ultimate tensile strength — exceeds A36 minimum (58 ksi) and A572 Gr. 50 minimum (65 ksi).

Question 2: A structural engineer specifies 50 ksi yield steel. The testing lab reports yield at 54,200 PSI. Does it pass?

Solution:

Lab result in ksi = 54,200 ÷ 1000 = 54.2 ksi

Required: ≥ 50 ksi

Margin: 54.2 - 50 = 4.2 ksi over minimum

Answer: 54,200 PSI = 54.2 ksi — passes the 50 ksi minimum yield requirement with 8.4% margin.

Question 3: High-strength bolts are torqued to 39,000 PSI tension. Express in ksi and identify the approximate bolt grade.

Solution:

Tension in ksi = 39,000 ÷ 1000 = 39 ksi

Compare to proof loads: Grade 2 = 55 ksi, Grade 5 = 85 ksi

39 ksi is well below proof loads — this is the installation tension, not yield

Answer: 39,000 PSI = 39 ksi bolt tension — approximately 70% of A325 minimum proof load (actual proof = 85 ksi).

Question 4: A pressure vessel steel plate has allowable stress of 20,000 PSI. What is this in ksi?

Solution:

Allowable stress = 20,000 ÷ 1000

= 20 ksi

Answer: 20,000 PSI = 20 ksi allowable — typical ASME Section VIII division 1 allowable for SA-516 Grade 70 at room temperature.

Practice Questions: PSI to ksi

Try solving these on your own to test your understanding:

Convert 45,000 PSI to ksi. (Answer: 45 ksi)
A wire has breaking strength of 250,000 PSI. Express in ksi. (Answer: 250 ksi)
Convert 100,000 PSI to ksi. (Answer: 100 ksi — typical quenched and tempered alloy steel)
Concrete has compressive strength of 5,000 PSI. Express in ksi. (Answer: 5 ksi)
A spring steel has fatigue limit at 85,000 PSI. Convert to ksi. (Answer: 85 ksi)

Structural Steel Grades: The Language of ksi

American structural engineering thinks in ksi. The two most common structural steels — A36 (36 ksi yield) and A572 Grade 50 (50 ksi yield) — form the backbone of US building and bridge construction. Grade 50 has largely replaced A36 for wide-flange beams because higher yield strength means lighter, more economical designs. AISC Steel Construction Manual tables list allowable stresses, connection capacities, and beam strengths all in ksi.

High-Strength Bolts: A325 vs. A490

Structural bolting uses two primary specifications: A325 (120 ksi minimum tensile = 120,000 PSI) and A490 (150 ksi minimum tensile = 150,000 PSI). A325 bolts are installed to 70% of tensile strength (≈39 ksi per bolt cross-section for slip-critical connections). A490 provides 25% higher capacity but is more brittle and cannot be galvanized. Bolt inspection verifies installation tension in ksi using calibrated bolt tension indicators.

Why Structural Engineers Use ksi Instead of PSI

Writing "36,000 PSI" repeatedly is cumbersome and error-prone (was it 3,600 or 36,000?). The ksi abbreviation eliminates trailing zeros and reduces confusion in calculations. Steel yield strength of "36 ksi" is cleaner than "36,000 PSI" in design equations. AISC, AASHTO, and ACI codes all use ksi for stress values. The transition happened in the 1960s-70s as structural analysis moved to computers that handled cleaner decimal values.

Key Takeaways

1 ksi = 1000 PSI — simply divide PSI by 1000 (move decimal 3 left).
A36 steel: 36 ksi yield / 58 ksi tensile (most common structural steel).
A572 Grade 50: 50 ksi yield / 65 ksi tensile (modern preferred grade).
A325 bolts: 120 ksi tensile; A490 bolts: 150 ksi tensile.
AISC, AASHTO, and ASME codes express stress in ksi, not raw PSI.
ksi notation eliminates trailing zeros and reduces calculation errors.

Psi to Ksi Conversion Formula

ksi = psi × 0.0010000

1 psi = 0.0010000 ksi

1 ksi = 1000.0000000 psi

Reverse: psi = ksi × 1000.0000000

Frequently Asked Questions

How many ksi are in 1 psi?

There are 0.0010000 ksi in 1 psi. To convert psi to ksi, multiply the value by 0.0010000.

How do I convert psi to ksi?

Multiply your psi value by 0.0010000 to get the equivalent in ksi. For example, 5 psi = 5 × 0.0010000 = 0.00500 ksi.

How do I convert ksi to psi?

Multiply your ksi value by 1000.0000000 to get the equivalent in psi. Alternatively, divide by 0.0010000.

What is 10 psi in ksi?

10 psi is equal to 0.01000 ksi.

What is 100 psi in ksi?

100 psi is equal to 0.10000 ksi.