Free engineering reference · 28 disciplines

Engineering calculators & data, one search away.

The Precision Bench is a free engineering reference: calculators, unit converters and property tables for fluid mechanics, HVAC, materials, electrical and 25 more disciplines. SI & Imperial units, built for the bench, the field, and your phone.

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Air properties Pipe sizing calculator Young's modulus Friction coefficients Psychrometric chart
4,000+Documents
28Disciplines
SI + ImperialUnits throughout

01 Quick convert

All unit converters →

Inline unit converter

No page loads. Pick a quantity, type a value.

02 Browse by discipline

View all 28 →
3D Bench · SketchUp extension

Drop real parametric parts into your model.

Flange beams, lumber, piping, stairs and more — standard and custom components, sized to spec, ready to model. A free SketchUp extension from The Precision Bench.

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04 Common questions

Is The Precision Bench free to use?

Yes. Every calculator, unit converter and reference table on The Precision Bench is free to use. There is no account, no paywall and no signup — just the data you came for.

Does it support both SI and Imperial units?

Yes. All calculators and property tables provide both SI (metric) and Imperial (US) units, and the inline unit converter switches between them instantly — temperature, length, pressure, volume, velocity and flow.

What engineering topics are covered?

The Precision Bench covers 28 disciplines including fluid mechanics, HVAC systems, material properties, electrical engineering, thermodynamics, piping systems, acoustics and pumps. Browse by discipline above or search across more than 4,000 technical references.

Can I use it on mobile?

Yes — The Precision Bench is built mobile-first. Every calculator, converter and table is responsive and touch-friendly, and you can add the site to your home screen for one-tap access on the job.

A free engineering reference for students and professionals

The Precision Bench provides free engineering calculators, unit converters and technical property tables for the design and analysis of real-world systems. Whether you need the density and specific weight of water across a temperature range, AWG wire gauge ampacity, Young's modulus for a material, or ASME B16.5 flange dimensions, the data is searchable and ready in both SI and Imperial units.

Engineers, designers and students use The Precision Bench for everyday tasks: calculating fluid properties like density, viscosity and thermal conductivity; sizing pipes and pumps; designing HVAC and hot-water heating systems; and converting units without a single page reload. Explore all 28 disciplines or start from the inline unit converter.