# Milling Speed and Feed Calc — Spindle Speed & Feed Rate

> Machining calculator for spindle speed (RPM) and feed rate (IPM). (iPhone/iPad app by Nitrio.)

- Source: https://appshunter.io/ios/app/milling-speed-and-feed-calc/id1447936543 (this page in markdown: same URL + `.md`)
- Developer: [Nitrio](https://appshunter.io/developer/321121189)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 3.80/5 from 24 App Store ratings · 9 written reviews indexed
- Age rating: 4+
- Requires: iOS 12 · 8 MB
- Languages: American English
- Released: 2019-01-10
- Data updated: 2026-09-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/milling-speed-and-feed-calc/id1447936543/reviews.md

## What is Milling Speed and Feed Calc?

Milling Speed and Feed Calculator are machining calculator to find Spindle Speed and Feed Rate fast and easy.

Determine the spindle speed (RPM) and feed rate (IPM) for a milling operation. Milling operations remove material by feeding a work-piece into a rotating cutting tool with sharp teeth, such as an end mill or face mill. 

Features:
- Instant calculation
- Result are copy able to other app
- Formula are include as reference
- Support up to 16 decimal place
- Support various unit for each input

For milling, drilling or creating a tool path for a CNC machine the feed rate must be determined. 
Calculations use the cutter diameter, number of teeth, cutting speed, and cutting feed, difference work-piece material and tool material should be chosen based on the specific cutting conditions. Materials have rated surface speeds for a given type of cutter. The harder the material the slower the speed.

Feed Rate is the speed at which the cutter engages the part and is typically measured in units/minute.

Spindle Speed is the rotational frequency of the spindle of the machine, measured in revolutions per minute (RPM). The preferred speed is determined by working backward from the desired surface speed (sfm or m/min) and incorporating the diameter (of workpiece or cutter).

Formula:
RPM = (12 * SFM) / (PI * CD)
RPM = 3.82 * SFM / CD
IPR = Ft x NT 
IPM = Ft x NT x RPM
IPM = IPR x rpm

Where:
RPM - Spindle Speed
Ft - Feed/Tooth, Chip Load/Tooth
SFM - Surface Speed
IPM - Feed Rate
CD - Cutter Diameter
NT - Cutter Number of Teeth
IPR - Cutting Feed

Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

## Key features

- Instant calculation
- Copy results to other apps
- Includes formulas for reference
- Supports 16 decimal places
- Supports various input units

## Recent user reviews (9 of 9)

All indexed reviews: https://appshunter.io/ios/app/milling-speed-and-feed-calc/id1447936543/reviews.md

### 1/5 — No options

*2023-09-07*

Waste of time

### 1/5 — Only HSS surface speeds

*2022-06-20*

no carbide surface speeds on the reference list.

### 1/5 — Waste of money

*2021-04-27*

I would like my money back

### 1/5 — Wasted $2.99

*2021-02-15*

This app is crap.  It does not work stay away don’t waste your money.

### 1/5 — Doesn’t work

*2020-04-24*

Poor app doesn’t work

### 1/5 — Randomly changes parameters

*2020-02-23*

This app changes the diameter of my end mill as I start entering data. 

You should be able to set the size and lock it
Same with rpm or feed

### 1/5 — Junk

*2019-04-29*

Don’t waste money to buy this.
Can not select material type for calculating speed and feed!

### 2/5 — Overpriced and lacks functionality

*2019-04-19*

Only does the one calculation, surface speed table only for HSS and in SFM not metric, chip loading only in imperial and app doesn’t give output in mm/min only a few different units available.

### 1/5 — Just keeps closing!

*2019-03-26*

Unable to enter data as the app close without warning
Units of measure cannot be saved as defaults

## Frequently asked questions about Milling Speed and Feed Calc

### What is Milling Speed and Feed Calc used for?

Milling Speed and Feed Calc is a machining calculator designed to quickly determine the spindle speed (RPM) and feed rate (IPM) for milling operations. It helps users find optimal cutting parameters for efficient material removal.

### How accurate are the calculations in Milling Speed and Feed Calc?

The app supports calculations up to 16 decimal places, ensuring a high degree of precision for machining parameters. It uses standard formulas to derive RPM and IPM based on user inputs.

### Can I use the results from Milling Speed and Feed Calc in other applications?

Yes, the results generated by Milling Speed and Feed Calc are copyable to other applications. This feature allows for easy integration of calculated values into your workflow or documentation.

### Does Milling Speed and Feed Calc support different units of measurement?

Yes, the application supports various units for each input. This flexibility ensures that users can input data according to their preferred measurement systems.

### Is Milling Speed and Feed Calc available on multiple devices?

Milling Speed and Feed Calc is available for iPhone, iPad, and iPod devices. It is designed to run on Apple's mobile operating systems.

### How often is Milling Speed and Feed Calc updated?

The latest version of Milling Speed and Feed Calc is 1.2, which was last updated on December 16, 2025. Updates typically bring improvements and bug fixes.

### What is the price of Milling Speed and Feed Calc?

Milling Speed and Feed Calc is a paid application, priced at $2.99. This one-time purchase grants you access to all its features.

### Does Milling Speed and Feed Calc include ads?

No, Milling Speed and Feed Calc does not contain advertisements. As a paid application, it offers an ad-free user experience.

## Version history (last 3 releases)

### 1.2 — 2025-12-16

- Updated for the newest devices.
- Minor bugs fixed.

### 1.1 — 2020-09-14

- Update for Newest Devices.
- Bugs Fixed.

### 1.0 — 2019-01-09

No release notes.

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All apps by Nitrio: https://appshunter.io/developer/321121189

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-10.*