Top 10 Free Machinist Calculators and CNC Tools For Every Modern Machine Shop

In modern CNC work you gain time and accuracy by making calculations fast and reliable. Whether you run a Haas VF series, an Okuma lathe or a mixed fleet of legacy machines, having a strong set of free or low-cost machinist calculators can improve feeds and speeds, cycle-time planning and day-to-day decision-making. 

FSWizard Machinist Calculator

FSWizard is one of the most widely used free calculators in machining. It covers milling, drilling, turning and tapping and includes support for chip thinning, high-speed machining style toolpaths and force calculations. Both the web version and the mobile Lite app are free, and while a Pro upgrade exists the free tier already serves most daily needs.

G Wizard Free CNC Calculators

G Wizard offers a browser version and a downloadable trial. Even without a subscription you get access to many shop-math tools, material reference data and feed-and-speed guidance. It is especially useful for those learning to estimate tool loads without overcutting or burning tools.

CNC Machinist Calculator (mobile app)

A popular mobile app that covers turning, milling, drilling, thread calculations, tap drill sizes, SFM conversions and bolt-circle math. Its free version handles most common shop calculations and does not require an account.

Machinist Buddy

A well known app among machinists looking for a simple, quick reference tool. It includes conversion tables, speeds and feeds helpers and angle or tap-drill calculators. Many shops use it as an operator-friendly reference during setups.

Machinist Calculator (Android and iOS)

This cross-platform app includes geometry calculators, speeds and feeds, thread charts and drilling references. The free tier is lightweight and simple, making it convenient for use right next to the machine.

Machining Mate

Machining Mate focuses on spindle speed, feed rate, material machinability and basic toolpath math. It is simple, clean and practical, and the free version is sufficient for cutters working common steels, aluminums and plastics.

HSMAdvisor Free Trial / Light Version

HSMAdvisor has a strong reputation among advanced programmers using dynamic milling paths. The Light version or trial is free and allows spindle-load evaluation, cutter-deflection estimates and material-removal-rate comparisons. It is especially helpful when you push adaptive toolpaths or long-stick-out cutters.

Kennametal Speed & Feed Calculator for machining

Kennametal’s free web tool instantly converts your tool diameter and material into RPM, IPM and SFM. It supports metric and imperial units and requires no subscription. Use it when you need a quick, accurate feed-and-speed calculation before production starts.

Allied Machine & Engineering “Machinist Tool” App

The Allied Machinist Tool app includes calculators and reference charts for machinists: speed and feed tools, thread drill charts (UN, ISO, ACME), G-code and M-code definitions, GD&T lookups and insert selector functions. The free download includes core features.

Machining Doctor Online Machining Calculators

Machining Doctor is a web portal offering a broad set of free calculators for machining operations. It includes chip-thinning, material-removal-rate (MRR), hardness conversions, turning vs milling math, finishing feed estimation and unit conversions. The entire set is freely accessible.

Why These Tools Matter

Good calculators reduce setup time, help you avoid trial-and-error and make feeds and speeds decisions more accurate. When a programmer or operator can check calculations quickly they are less likely to break tools, burn parts or waste time. Free or low-cost tools make these capabilities accessible in any shop.

How to Put Them Into Daily Use

Choose one or two calculators that your team will actually use and standardize them. Validate their default material and cutter data so calculations align with your machines. Treat the calculator workflow as part of your continuous improvement process, not just a one-time upgrade. Where possible, integrate the calculator’s output into your monitoring or tooling database for better tracking.

About MDCplus

Our key features are real-time machine monitoring for swift issue resolution, power consumption tracking to promote sustainability, computerized maintenance management to reduce downtime, and vibration diagnostics for predictive maintenance. MDCplus's solutions are tailored for diverse industries, including aerospace, automotive, precision machining, and heavy industry. By delivering actionable insights and fostering seamless integration, we empower manufacturers to boost Overall Equipment Effectiveness (OEE), reduce operational costs, and achieve sustainable growth along with future planning.