Material Removal Rate Calculator

In machining and manufacturing, Material Removal Rate (MRR) is one of the most important performance measures. It tells us how much material is removed from a workpiece per unit time. Knowing the MRR helps machinists, engineers, and CNC programmers optimize cutting conditions, tool life, and overall productivity.

We have developed this Material Removal Rate Calculator so that anyone can easily calculate MRR for different machining processes like milling, turning, drilling, grooving, and grinding. The calculator works with both metric and imperial units and provides accurate results instantly.

What is Material Removal Rate?

Material Removal Rate (MRR) is the volume of material removed from a workpiece in a given amount of time. It is usually expressed in mm³/min, cm³/min, or in³/min. The higher the MRR, the faster the machining process, but excessive MRR can reduce tool life or surface finish quality.

Mathematically, MRR is based on:

MRR = (Cross-sectional area of cut) × (Feed rate or cutting speed)

This universal principle is then adjusted for each machining process.

Material Removal Rate Formulas

Material Removal Rate in Milling

In milling, MRR depends on the depth of cut, width of cut, and feed rate:

MRR = Depth of cut × Width of cut × Feed rate

Material Removal Rate in Turning

For turning, the formula is:

MRR = Depth of cut × Feed per revolution × Cutting speed

Material Removal Rate in Drilling

For drilling, the formula considers the circular cross-section of the drill:

MRR = (π × D² / 4) × (Feed per revolution × RPM)

where D = drill diameter.

Material Removal Rate in Grinding

For surface grinding, MRR can be expressed as:

MRR = Width of cut × Depth of cut × Table feed rate

Material Removal Rate Units

• mm³/min
• cm³/min (1 cm³ = 1000 mm³)
• in³/min (1 in³ = 16.387 cm³)

How to Use the Material Removal Rate Calculator

1. Select the machining process (milling, turning, drilling, grooving, or grinding).
2. Enter the required values such as depth of cut, feed, diameter, width, or RPM.
3. Choose the input units (mm, in, m/min, ft/min).
4. Click calculate to get the Material Removal Rate result in your desired unit.
5. The result will instantly show MRR in mm³/min, cm³/min, in³/min, or cc/min.

This calculator works just like an MRR Excel sheet, but it is more convenient because everything is automated online.

Final Verdict

The Material Removal Rate Calculator is a practical tool for machinists, students, and engineers who need quick and accurate machining calculations. Instead of working through long formulas, you can get instant results in seconds. Whether you are working on steel, aluminum, or any other material, this calculator helps you optimize machining efficiency, select proper cutting parameters, and save valuable time.

FAQs

What is the formula for material removal rate?

The general formula is MRR = (Cross-sectional area of cut) × (Feed rate).

How do you calculate removal rate in turning?

MRR = Depth of cut × Feed per revolution × Cutting speed.

What is the grinding material removal rate?

In grinding, MRR = Width of cut × Depth of cut × Table feed.

What is the unit of material removal rate?

The standard units are mm³/min, cm³/min, or in³/min.

What is SFM per minute?

SFM stands for Surface Feet per Minute, which is the cutting speed in imperial units. It measures how fast the cutting tool moves across the surface of the material.