# Hardness Conversion Calculator (HRC, HV, HB)

URL: https://speedycalculator.com/calculators/conversion/hardness-conversion/
Last updated: 2026-10-25

> The hardness conversion calculator converts steel hardness between Rockwell C (HRC), Vickers (HV) and Brinell (HB) and estimates tensile strength, by interpolating the ASTM E140 conversion table for non-austenitic steels. Everything is calculated in your browser; nothing you type is sent to our server.

## Inputs

- I have a hardness in
- Hardness value

## Results

- Rockwell C (HRC)
- Vickers (HV)
- Brinell (HB)
- Approximate tensile strength

## Formula

```
Linear interpolation between rows of ASTM E140, Table 1
```

## Explanation

Hardness tests press an indenter into a material and measure the dent, but each test uses a different indenter and load, so there is no exact formula between scales. Standard tables based on experiments are used instead; they are valid for steel and only approximately for other metals.

### How to use the Hardness Conversion Calculator

- **I have a hardness in**
- **Hardness value**

Everything runs in your browser, so results appear instantly and nothing you type is sent to a server.

### How it works

Your value is located between two rows of the steel conversion table and the other scales are linearly interpolated. Brinell values above 650 HB assume a tungsten-carbide ball.

## Worked example

Inputs — I have a hardness in: Rockwell C (HRC); Hardness value: 45.

Results — **Rockwell C (HRC) = 45.0**; Vickers (HV) = 446; Brinell (HB) = 421; Approximate tensile strength = ≈ 215 ksi (1482 MPa).

## FAQ

**How hard is HRC 60?**
About 697 HV, a typical hardened tool steel or knife blade.

**Can I convert hardness for aluminium?**
Not with this table; it is for steel. Other metals have their own tables.

**Is tensile strength exact?**
No; it is an approximation from hardness, typically within ±10% for carbon and alloy steels.

**What formula does the Hardness Conversion Calculator use?**
Linear interpolation between rows of ASTM E140, Table 1.


## Sources

- [ASTM E140 – Standard Hardness Conversion Tables for Metals](https://www.astm.org/e0140-12br19e01.html)