Engineering Unit Converter

Convert pressure, temperature, flow rate, energy and humidity units used in HVAC engineering.

What is the Engineering Unit Converter?

The engineering unit converter performs fast and verified conversions between physical quantities used in HVAC, humidity control and energy engineering. It supports 100+ unit pairs across 11 categories: pressure, temperature, flow rate, energy, power, length, volume, velocity, mass/force, cost and steam.

Main supported units: pressure (Pa, kPa, bar, mbar, atm, psi, inHg, mmHg, inH₂O), temperature (°C, °F, K), flow rate (m³/h, m³/s, L/s, CFM, gpm), energy (kJ, kWh, Btu, kcal, therm), power (kW, hp, ton refrigeration, Btu/hr, kcal/hr), humidity ratio (g/kg, gr/lb), length (m, ft, in, mm) and volume (m³, ft³, L, gal). Conversion factors follow ASHRAE Fundamentals Table A-4 and the ISO 80000 unit standard.

Temperature conversions use linear equations (°F = °C × 9/5 + 32; K = °C + 273.15); other quantities use proportional factors. In the steam category, saturation temperature and latent heat (h_fg) at given absolute pressure are derived automatically — a practical estimator for steam humidifier and steam coil sizing.

NKT engineering uses this tool in international project coordination (European SI ↔ US Imperial), specification verification, procurement technical comparison, and field calibration validation. Conversion history is stored locally in the browser; frequently used conversions can be pinned for quick access.

Applications

• HVAC and humidity control engineering
• International project coordination (SI ↔ Imperial)
• Technical specification and contract verification
• Procurement technical comparison
• Field calibration verification
• Steam humidifier / coil sizing aid
• Data center and clean room spec conversion
• Educational and engineering reference

Articles related to this calculator

In-depth content to support your engineering decision after completing the calculation.

Reference Guide

Why Relative Humidity, Absolute Humidity and Dew Point Matter in Humidification

RH, absolute humidity and dew point measure water in the air from three different perspectives. Correct parameter selection drives humidifier sizing, sensor architecture and control algorithm.

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Technical Article

How to Read a Psychrometric Chart for Humidification Systems

A practical reading guide to interpret the psychrometric chart on the field: axes, locating an air state, how humidification processes look on the chart, and reading capacity off the chart.

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Technical Article

How to Measure Humidity Levels in Industrial Environments?

How to Measure Humidity Levels in Industrial Environments? Measuring humidity levels in industrial environments is preferred by manufacturers for precise production processes and product quality.

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Technical terms used in this tool

Access concise ASHRAE-referenced definitions of technical concepts you encounter in the calculation.

Frequently Asked Questions

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