Convert without changing the quantity
Use this free HVAC unit converter when comparing a calculation, drawing and manufacturer schedule that use different units. Common ACMV tasks involve airflow in L/s or m³/h, cooling capacity in kW or BTU/hr, and dimensions expressed in metric or imperial units. Calculate without an account and confirm the physical quantity before copying a value. A conversion changes its numerical expression, not the underlying equipment performance or design requirement.
Inputs and conversion relationships
Choose the quantity and the input and output units, then enter the value to convert. The existing converter applies a scale relationship for quantities such as airflow, length and pressure, and an offset relationship for absolute temperature. For airflow, 1 m³ equals 1,000 L and 1 hour equals 3,600 seconds, so m³/h = L/s × 3.6. These factors follow the unit definitions rather than a project-specific design assumption.
Worked example: airflow schedule
Assume a branch airflow of 500 L/s that must be written in a schedule using m³/h. Select airflow, enter 500 in L/s, and convert to m³/h. The result is 500 × 3.6 = 1,800 m³/h. The reverse check is 1,800 / 3.6 = 500 L/s. This example does not say that the branch is correctly sized; it only confirms that both numbers describe the same assumed flow.
Temperature and capacity distinctions
Distinguish an absolute temperature from a temperature difference. For example, an assumed air temperature of 24°C corresponds to 75.2°F through °F = 1.8 × °C + 32. A temperature difference of 5°C instead corresponds to 9°F and must not include the offset. Likewise, cooling thermal capacity in kW is not the same as a compressor’s electrical input in kW. Conversion cannot supply the missing efficiency or operating-condition information.
Rounding and practical checks
Keep sufficient precision during intermediate work and round only when preparing the displayed schedule or design note. Confirm whether pressure refers to absolute, gauge or differential pressure and whether an airflow quantity describes actual or standard conditions. A numerical converter does not correct mismatched measurement bases. Check the units printed on equipment data sheets and identify any reference conditions before interpreting two converted values as directly comparable measurements or guaranteed equipment ratings.
Singapore project review
Treat this output as a draft for review, not a stamped design or an approval. For a Singapore submission, check the applicable SS553 requirements and the project specification with the responsible designer. Verify the input schedule, record the assumptions, and reconcile the calculation with drawings and manufacturer data. This tool does not identify every applicable requirement, certify compliance, or replace professional judgement about installation, operation, safety, and maintenance. Retain the calculation date and revision so later changes can be traced to their original assumptions.