Convert between °F, °C, and Kelvin. Includes HVAC-specific reference points and design temperature context.
Convert between all HVAC pressure units — inches water gauge, Pascals, kPa, psi, bar, atm, and mmHg.
Convert refrigerant pressures between psig, kPag, and bar with saturation temperature lookup for R-410A, R-32, R-454B, R-22, and R-134a.
Convert between BTU/hr, kW, W, Tons of refrigeration, HP, and kcal/hr. Essential for comparing Imperial and Metric equipment specs.
Convert between BTU, kWh, MJ, GJ, therms, m³ of natural gas, and tonnes of CO₂ equivalent for energy audits and comparisons.
Convert between inches, feet, mm, cm, and metres. Includes duct dimension conversion tables for common round and rectangular duct sizes.
Convert between ft², in², m², cm², and other area units. Useful for wall, window, and floor area conversions in load calculations.
Convert between Imperial R-value (hr·ft²·°F/BTU) and metric RSI (m²·K/W). Essential for comparing insulation specs across Imperial and Metric standards.
Convert between Imperial U-factor (BTU/hr·ft²·°F) and metric U-value (W/m²·K). Includes window and wall U-factor reference table.
Convert between FPM, m/s, km/h, and MPH. Includes ASHRAE recommended velocity ranges for supply, return, and exhaust ducts.
Convert water and fluid flow rates between GPM, L/min, L/s, m³/h, and m³/s. Useful for hydronic heating, chiller, and cooling tower systems.
Full multi-unit airflow converter: CFM, L/s, m³/h, m³/s, ACH, and CMM. Includes room volume input for ACH calculations.
Convert between BTU, BTU/hr, kWh, and kW quickly. Includes reference table for common HVAC equipment capacities in both units.
Instantly convert CFM to L/s and back. The most common airflow unit conversion for Canadian HVAC — Imperial equipment specs to metric design standards.
Convert tons of refrigeration to BTU/hr, kW, and W. Includes reference table for 1–25 ton equipment common in Canadian commercial systems.
Convert inches of water column to Pascals and back. Fast single-purpose converter for duct static pressure and blower door readings.
Convert between kWh, MJ, GJ, and BTU. Essential for Canadian energy audits and EnerGuide reporting where MJ and GJ are standard units.
Convert between COP, EER, and kW/ton efficiency ratings. Compare heat pump and chiller efficiency across manufacturer datasheets from different regions.
Convert between SEER, SEER2, COP, EER, and HSPF ratings. Includes Canada's minimum efficiency standards and NRCan EnerGuide rating context.
Convert between relative humidity, dew point, wet-bulb temperature, absolute humidity, and humidity ratio. Useful for psychrometric calculations.
Convert enthalpy values between BTU/lb, kJ/kg, and kcal/kg. Essential for psychrometric analysis, coil selection, and heat recovery calculations.
Convert air density between kg/m³ and lb/ft³. Includes altitude correction for Calgary, Edmonton, and other high-elevation Canadian cities.
Convert specific heat values between BTU/lb·°F, kJ/kg·K, and kcal/kg·°C. Includes reference values for air, water, glycol, and refrigerants.
Convert thermal conductivity (k-value) between BTU·in/hr·ft²·°F, W/m·K, and kcal/m·hr·°C. Reference table for insulation, metals, and building materials.
Convert thermal resistance between Imperial R-value, metric RSI, and °C·m²/W. Includes common wall and roof assembly reference values.
Convert heat flux density between W/m², BTU/hr·ft², and kcal/hr·m². Used in envelope heat loss analysis, radiant panel design, and solar gain calculations.
Convert dynamic and kinematic viscosity between cP, mPa·s, Pa·s, cSt, and ft²/s. Useful for glycol mix, refrigerant oil, and hydronic fluid selection.
Convert between ft³, m³, litres, gallons (US and Imperial), and cm³. Useful for tank sizing, duct volume, and refrigerant charge calculations.
Convert between kg, g, lb, oz, and tonnes. Handy for refrigerant charge weights, equipment shipping weights, and ductwork material estimates.
Every HVAC unit in one place — temperature, pressure, airflow, power, energy, length, and area. The go-to converter when you need multiple unit types on one screen.
About HVAC Unit Conversion
Canadian HVAC professionals work across two unit systems every day. Equipment from US manufacturers arrives in BTU/hr, CFM, and tons. Canadian codes and engineering standards use kW, L/s, and kPa. These converters close that gap instantly so you spend your time on design decisions, not arithmetic.
Why Unit Conversion Matters in Canada
Canada officially adopted the metric system in the 1970s, but HVAC equipment — particularly from US suppliers — still ships with Imperial datasheets. The National Building Code references metric units, yet most field technicians work in Imperial daily. That dual-system reality means a Canadian HVAC engineer routinely converts CFM to L/s for duct design, BTU/hr to kW for electrical sizing, and psig to kPa for refrigerant work — often within the same project. Use the Airflow Unit Converter and Pressure Converter to handle the most frequent conversions.
Refrigeration and Pressure Units
Refrigerant work adds another layer of complexity. Gauge pressure in psig is standard on North American manifold sets, while Canadian engineering drawings specify kPa or bar. The Refrigerant Unit Converter and inH₂O to Pa Converter handle the conversions most technicians reach for on the job. For saturation temperature lookups by pressure, see the Refrigeration tools.
Efficiency Ratings — SEER, COP, and EER
Equipment efficiency ratings vary by region and standard. Canadian NRCan EnerGuide labels use SEER and HSPF. European and international datasheets report COP. Commercial chillers are rated in kW/ton. The SEER / COP / HSPF Converter and COP / EER Converter let you compare equipment across specs without ambiguity.
Thermal Properties for Load Calculations
Insulation specs, window ratings, and envelope assemblies are published in both Imperial and metric. R-20 batt insulation is RSI 3.52. A window with a U-factor of 0.28 BTU/hr·ft²·°F is 1.59 W/m²·K. The R-Value / RSI Converter, U-Value Converter, and Thermal Conductivity Converter handle these directly. Feed results into wall heat loss and window heat loss calculators for full load analysis.
Related Tools
Converted values feed directly into load calculations, duct design, and refrigeration tools across this site. For psychrometric work involving enthalpy, humidity ratio, and dew point, see the Psychrometrics category. Energy unit conversions like kWh to GJ are also used in energy efficiency analysis and EnerGuide reporting.
Frequently Asked Questions
Canada officially adopted the metric system, and building codes and engineering specifications are written in metric (kPa, kW, L/s, metres). However, most HVAC equipment sold in Canada is manufactured for the broader North American market and labelled in Imperial units (psi, BTU/hr, CFM, inches). Technicians and engineers convert between the two constantly — reading a psi gauge and reporting kPa on a commissioning form, or sizing a furnace rated in BTU/hr against an electrical panel sized in kW.
The most frequent conversions are CFM to L/s (airflow and ventilation code compliance), BTU/hr to kW (equipment capacity and electrical sizing), psig to kPa (refrigerant gauge readings), and inches of water column to Pascals (duct static pressure). The All-in-One HVAC Unit Converter keeps all of these on one page for quick daily use.
Yes. Every converter on this page uses the standard published conversion factors (for example, 1 BTU/hr = 0.293071 W, 1 CFM = 0.471947 L/s) rather than rounded approximations. Results are shown to appropriate precision for field and engineering use. For any conversion where regulatory or code compliance is being verified, always cross-check against the exact factor specified in the applicable code or standard for your jurisdiction.
No. Every converter on AskHVAC.ca is free to use with no login, signup, or account required. Results calculate instantly in your browser as you type. This applies to all 30+ unit converters in this category as well as the load calculation, duct design, refrigeration, and other tools across the site.
Each converter page needs an initial internet connection to load, but the conversion calculations themselves run locally in your browser once the page is open. For best results, load the specific converter page you'll need before heading to a site with poor signal. Bookmarking frequently used tools like the Pressure Converter or CFM to L/s Converter makes them quicker to find later.