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MachiningCalc / Reamer Speeds & Feeds Calculator

Reaming · speeds and feeds

Reamer Speeds & Feeds Calculator

Convert reaming-specific cutting speed and feed per revolution into spindle RPM and machine feed, without mixing drilling and reaming assumptions.

Instant resultNo signupFormula shownReviewed Aug 2026
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Calculator

Enter the known values. Results update automatically.

Spindle speed—
Feed rate—
Surface speed—
Feed / revolution—

Use tooling manufacturer data and stay within machine, tool and workholding limits. Calculated values are not a substitute for validated process parameters.

Immediate resultUpdates as inputs change
US machining unitsSFM, RPM, IPR, IPM
Formula visibleNo black-box output
Focused intentOne machining job per URL

Calculation method

Calculation

RPM = SFM × 12 ÷ (π × Reamer Diameter)IPM = RPM × Feed per Revolution

Use values in the units shown by the calculator. Inputs must be positive and physically meaningful.

Reamer speeds

Use a reaming-specific SFM rather than assuming the drill speed is correct. Reaming is a finishing operation with different edge geometry, allowance and surface-finish goals.

Reamer feeds and inches per revolution

The linear feed is RPM × IPR. IPR should come from the reamer manufacturer's data for the tool diameter, flute style and work material.

Materials, geometry and machine-tool conditions

Tool material, workpiece hardness, reaming allowance, alignment, runout, coolant and hole condition all affect the practical parameters. A reamer entering a poorly located or undersized hole may not behave like the same reamer in a well-prepared bore.

How to interpret the result

The calculator tells you what RPM and IPM correspond to the SFM and IPR you entered. It does not select the correct reaming SFM or feed automatically; that decision belongs to validated cutting data.

Methodology, standards and validation

MachiningCalc separates deterministic math from cutting-data recommendations. The calculator performs the geometry and unit relationships; the correct starting cutting data still depends on the tool, work material, coating, machine and setup.

Sources and methodological references

Frequently asked questions

Reamer Speeds & Feeds Calculator: common questions

How do you calculate reamer speed and feed?

Calculate RPM from reaming SFM and reamer diameter, then multiply RPM by the reamer feed per revolution to get IPM.

How fast should I run a reamer?

Use reaming-specific cutting data from the reamer manufacturer for the exact tool and material. Reaming values should not be copied blindly from drilling.

What are the recommended speeds and feeds for an HSS reamer?

There is no single universal setting. Diameter, HSS grade, flute geometry, material, allowance and coolant all matter; start from the manufacturer's reaming table.

What does IPR mean in reaming?

IPR is inches per revolution: the axial distance the reamer advances for each spindle revolution.

Why can too little feed be a problem?

A reamer needs to cut rather than rub. Extremely light feed can increase rubbing and degrade finish, but the correct value is tool- and material-specific.