Feedwright CNC Calculator

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About this app

Feedwright is a CNC calculator and machinist calculator for the mill and the lathe: speeds and feeds, RPM, feed rate, chip load, threads, tap drills, bolt circles, tapers and sine bar stacks, in inch and metric. Made for machinists, CNC programmers and operators, toolmakers and students.

It works like a hardware calculator: a steel-blue chassis, real keys and a clear LCD, with each answer labelled so you know what you are reading. Results are shown in decimals, the way machinists read them.

SPEEDS AND FEEDS
• Spindle RPM for milling, turning and drilling, from surface speed and diameter in SFM or m/min
• Surface speed or diameter back from the other two
• Feed rate in IPM or mm/min = RPM × chip load × number of teeth
• Feed per revolution in IPR or mm/rev, and feed from a feed per revolution
• Chip load per tooth from feed, RPM and teeth

THREADS AND TAP DRILLS
• Unified inch and ISO metric 60 degree threads
• Major, pitch and minor diameters and thread height
• Tap drill for 75 percent thread, or any percent you set
• Percent thread of a given drill
• Built-in tables of common unified and metric threads

BOLT CIRCLES
• X and Y of every hole from the centre, for any hole count
• Start angle for the first hole
• Chord distance between holes

TAPERS AND SINE BAR
• Included angle and compound setting from two diameters and a length
• Taper per foot and taper ratio
• The other diameter from a known angle
• Sine bar gauge block stack for an angle, or the angle for a stack, on a 5 in, 100 mm or any bar

MATERIALS
• Starting surface speeds for high-speed steel and carbide in aluminium, mild steel, 4140, 304 stainless, cast iron, brass and titanium
• Brinell hardness from the indentation diameter, with a tensile strength estimate for steels

WORKS THE WAY YOU DO
• Inch and metric, and each thread keeps its own system
• A results strip shows every solved value at once
• 10 memories, a tape of your calculations, reference tables and a key guide
• Large keys you can hit with gloves on

FREE TO TRY, THEN UNLOCK ONCE
Free to try: every feature for 7 days. Then unlock Pro once — no subscription, no ads, works offline.

PRIVATE BY DESIGN
Works offline, no account, no data collected. Everything stays on your device.

How it's calculated: the formulas and tables behind every result, at https://wrightcalc.app/feedwright/

Questions or feedback: [e-mail]

Results are computed from the formulas shown for each function and are provided for reference only. Material speeds are starting values: adjust for your machine, tooling, setup and coolant, and follow the tool maker's data. Verify every dimension before machining. The developer accepts no liability for loss or damage arising from use.

What’s new

Bug fixes and improvements.