Unit Converter tool for chemical engineers [free pdf]

As a chemical engineer with 7+ years of experience working across industries like pharmaceuticals, agrochemicals, and polysilicon plants, I’ve seen firsthand how important accurate unit conversions are in day-to-day operations. Whether it’s sizing a steam line, designing a heat exchanger, or checking pump flow rates, even a small mistake in units can lead to inefficiency, safety issues, or costly downtime.

That’s why I created this unit converter tool to provide engineers, students, and plant professionals with a simple, reliable way to switch between common units without second-guessing the math. We have a free PDF at the end of post which you can download for offline use

Units are very important for chemical engineers as well and students. Here are important, useful unit conversion formulas

Pressure

• 1 bar = 1×10⁵ Pa
• 1 atm = 1.01325×10⁵ Pa
• 1 psi = 6 894.757 Pa
• 1 mmHg (torr) = 133.322 Pa

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Length Conversion Factors

• 1 kilometer (km) – 1000 meters (m) = 0.62137 miles (mi)
• 1 meter (m) – 100 centimeters (cm)
• 1 centimeter (cm) – 0.01 meters (m) = 0.3937 inches (in)
• 1 micron (μm) – 1 × 10⁻⁶ meters (m)
• 1 inch (in) – 25.4 millimeters (mm) = 2.54 centimeters (cm) = 0.0254 meters (m)
• 1 inch (in) – 0.08333 feet (ft) = 0.02778 yards (yd) = 1.578 × 10⁻⁵ miles (mi) = 0.25 hands (hand)
• 1 foot (ft) – 30.48 centimeters (cm)

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Volume Conversion Factors

• 1 liter (L) – 1000 cm³
• 1 liter (L) – 61.02 in³
• 1 liter (L) – 0.03532 ft³
• 1 cubic meter (m³) – 1000 L = 35.32 ft³
• 1 cubic foot (ft³) – 28.32 L = 0.02832 m³ = 7.481 U.S. gallons (gal)
• 1 U.S. gallon (gal) – 3.785 L = 231 in³
• 1 British gallon – 1.201 U.S. gal = 277.4 in³
• 1 cm³ – 0.061 in³

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Temperature

• K = °C + 273.15
• °C = K − 273.15
• °F = °C × 9/5 + 32
• °C = (°F − 32) × 5/9

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Flow rate

• 1 L/min = 0.06 m³/h
• 1 L/min = 0.264172 GPM (US)
• 1 GPM = 0.227124 m³/h
• 1 SCFM = 0.0283168 m³/min

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Mass & Volume

• 1 kg = 1000 g
• 1 lb = 0.453592 kg
• 1 m³ = 1000 L = 10⁶ mL
• 1 ft³ = 0.0283168 m³

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Density

• 1 g/cm³ = 1000 kg/m³
• 1 kg/m³ = 0.062428 lb/ft³

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Energy & Power

• 1 kJ = 1000 J
• 1 cal = 4.184 J
• 1 kcal = 4184 J
• 1 BTU = 1055.06 J
• 1 kWh = 3.6×10⁶ J
• 1 hp = 745.7 W

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Viscosity

• 1 Pa·s = 1000 cP
• 1 P (poise) = 0.1 Pa·s

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Concentration

• Molarity, M = mol solute / L solution
• Molality, m = mol solute / kg solvent
• Mass % = (mass solute / mass solution) × 100
• Vol % = (vol solute / vol solution) × 100

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Gas flow @ STP

• 1 Nm³ = 1 m³ (0 °C, 1 atm)
• 1 SCF = 0.0283168 Nm³
• 1 Nm³ = 35.3147 SCF

Free Download: Get the complete Chemical Engineering Unit Conversion Chart (PDF)

FAQ (Unit conversions Factors)