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Marine parts & equipment

Marine unit converter

Convert length, pressure and power units when preparing an equipment or replacement-part enquiry.

Uses the international inch and foot. Enter decimal values; for example, use 1.5 instead of 1½.

Enter zero or a positive number, using a decimal point. Scientific notation such as 1e3 is also accepted.

Converted resultEnter a value to convert.

Displayed results are rounded to nine significant digits.

Quick reference

Common conversions.

Length1 in = 25.4 mm

International inch; 1 ft = 0.3048 m.

Pressure1 bar ≈ 14.5038 psi

Pressure reference stays the same.

Mechanical power1 hp ≈ 0.745700 kW

Mechanical hp is defined as 550 ft·lbf/s.

Metric power1 PS ≈ 0.735499 kW

Metric horsepower is a separate unit.

Conversion definitions & sources

Length, pressure and power definitions are checked against NIST SP 811, Appendix B.9. International inch/foot, pound-force and standard-gravity factors are also recorded in RCC Standard 156-10, Table 6.

The tool uses 0.0254 m/in, 0.3048 m/ft and standard gravity of 9.80665 m/s². Mechanical hp is calculated from 550 ft·lbf/s; metric hp (PS) from 75 kgf·m/s. Results use the full factors before display rounding.

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