# ksi to MPa Converter

URL: https://speedycalculator.com/calculators/conversion/ksi-to-mpa/
Last updated: 2026-10-25

> Convert ksi (ksi) to megapascals (MPa): 1 kilopound per square inch = 6.8947573 MPa, so multiply by 6.8947573 or divide by 0.14503774. Both fields are editable, so you can also type in megapascals and get ksi back.

## Inputs

- Ksi (ksi)

## Results

- Megapascals

## Formula

```
1 ksi = 6.8947573 MPa
1 MPa = 0.14503774 ksi
MPa = ksi × 6.8947573
```

## Explanation

Material strengths in U.S. specifications are given in ksi (thousands of psi); international standards use MPa. ASTM A36 steel’s 36 ksi yield strength is about 248 MPa.

### How to use the ksi to MPa Converter

- Type the number of ksi into the **Ksi** field. Decimals such as 18 are fine.
- Read the answer in **Megapascals** – it updates as you type, with no button to press.
- To convert the other way, type into **Megapascals** and the ksi are recalculated.
- Press **Copy results** to copy both values with the page title, or **Copy link** to share this exact conversion.

This page converts only ksi ⇄ MPa. Need a different unit? Use the general pressure converter, where you can choose any “from” and “to” unit.

### How it works

Both units measure pressure, so they are always in the same ratio: one kilopound per square inch equals 6.8947573 megapascals. The calculator multiplies the number of ksi you type by 6.8947573 to give megapascals, and when you type into the megapascals field it divides by the same factor to give ksi. Because the ratio never changes, doubling the ksi always doubles the megapascals. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).

### How to convert ksi to megapascals

- Write down the value in ksi, for example **36 ksi**.
- Multiply by the conversion factor 6.8947573 (because 1 kilopound per square inch = 6.8947573 MPa).
- 36 × 6.8947573 = **248.21126 MPa**.
- To go back from megapascals to ksi, divide by 6.8947573 – or multiply by 0.14503774.

### ksi to MPa conversion table

KsiMegapascalsMegapascalsKsi1 ksi6.8947573 MPa1 MPa0.14503774 ksi10 ksi68.947573 MPa2 MPa0.29007548 ksi30 ksi206.84272 MPa5 MPa0.72518869 ksi36 ksi248.21126 MPa10 MPa1.4503774 ksi50 ksi344.73786 MPa20 MPa2.9007548 ksi60 ksi413.68544 MPa50 MPa7.2518869 ksi65 ksi448.15922 MPa100 MPa14.503774 ksi100 ksi689.47573 MPa1,000 MPa145.03774 ksi150 ksi1,034.2136 MPa

### What is a kilopound per square inch?

A ksi is 1,000 psi. U.S. engineers use it for material strengths, such as 36 ksi structural steel or 4 ksi concrete.

### What is a megapascal?

A megapascal is one million pascals, the same as one newton per square millimetre. Material strengths and hydraulic pressures are given in MPa.

### Quick mental conversion

For a fast estimate, multiply ksi by about **6.9** to get megapascals; the error is about 0.1%. Use the calculator above when you need the exact figure.

### Common mistakes to avoid

Mixing gauge pressure (psig, barg) with absolute pressure (psia, bara), treating bar and atm as identical, and confusing kgf/cm² with bar.

## Worked example

Inputs — Ksi: 36 ksi.

Results — **Megapascals = 248.21126255 MPa**.

## FAQ

**How many MPa is 1 ksi?**
About 6.895 MPa.

**How many ksi is 250 MPa?**
About 36.3 ksi.

**How do I convert ksi to megapascals?**
Multiply the number of ksi by 6.8947573. For example, 36 ksi × 6.8947573 = 248.21126 MPa.

**How do I convert megapascals back to ksi?**
Divide by 6.8947573 (or multiply by 0.14503774), or simply type the value into the megapascals field above.

**What is 10 ksi in megapascals?**
10 ksi = 68.947573 MPa.

**What is 100 ksi in megapascals?**
100 ksi = 689.47573 MPa.

**Is this conversion exact?**
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.

**Can I convert to other units on this page?**
This page converts only between ksi and megapascals. To pick any pressure unit, use the general pressure converter linked under Related calculators.

**What formula does the ksi to MPa Converter use?**
1 ksi = 6.8947573 MPa.


## Sources

- [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)