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THE MACHINEBLUE BOOKResearch · Market · Ownership
PRECISE MACHINE-SHOP UNIT CONVERSIONS

Convert the unit.
Preserve the measurement.

A transparent metric and imperial converter for the dimensions, mass, power, torque, pressure, flow and temperature units used around machine tools.

NIST-ALIGNED CONVERSION FACTORS

Convert the unit without inventing measurement precision.

The calculator uses defined factors where available and labels distinct horsepower, gallon, ton and force units instead of treating similar names as equivalent.

MACHINE-SHOP UNIT CONVERTER

Dimensions, mass, power, torque, pressure, flow and temperature.

Result—
Equation—
1 in = 25.4 mmExact international definition
1 ft = 0.3048 mExact international definition
1 lb = 0.45359237 kgExact avoirdupois definition
1 U.S. gal = 3.785411784 LExact U.S. liquid gallon relationship
1 kWh = 3.6 MJExact relationship
1 bar = 100 kPaExact SI relationship
1 ft³ = 0.028316846592 m³Derived from exact foot definition
1 lbf·ft ≈ 1.355817948 N·mStandard-force conversion
1 mechanical hp ≈ 0.745699872 kW550 lbf·ft per second
Precision rule.

An exact conversion factor does not improve the original measurement. If a machine width is reported as 80 inches with only two significant digits, displaying 2,032.000000 millimeters does not make the underlying measurement exact.

Electrical-planning boundary.

This reference explains terms and arithmetic. It does not size conductors, overcurrent protection, transformers, disconnects, grounding, arc-flash protection or a branch circuit. Use the exact machine documentation, the authority having jurisdiction and qualified electrical professionals. Servicing also requires an applicable hazardous-energy control program.

PRIMARY SOURCES

Conversion-factor authority.