Unit converters
Pressure converter: bar, psi, kPa, atm
Convert pressure between bar, psi, kPa, MPa, atm, kgf/cm² and mmHg instantly — free and without sign-up.
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Oil volume converter: barrels, m³, litres, gallons
Convert oil and liquid volumes between barrels (bbl), thousand and million barrels, cubic metres, litres and gallons.
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Energy converter: MMBtu, GJ, kWh, boe, toe
Convert energy between joules, GJ, kWh, Btu, MMBtu, therms, barrels of oil equivalent (boe) and tonnes of oil equivalent (toe).
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Liquid flow rate converter: m³/h, gpm, bbl/d
Convert liquid flow rates between m³/h, m³/d, L/s, L/min, US gpm, barrels per hour and barrels per day.
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Gas flow rate converter: MMscfd, Sm³/d
Convert gas flow rates between Sm³/d, Sm³/h, MMSm³/d, scf/d, Mscf/d, MMscf/d and Bscf/d.
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Temperature converter: °C, °F, K, °R
Convert temperature between degrees Celsius, degrees Fahrenheit, kelvin and degrees Rankine.
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API gravity converter: °API, specific gravity, density
Convert API gravity, specific gravity and density of crude oil and products, with barrels per tonne.
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Fluids and hydraulics
Reynolds number calculator
Calculate the Reynolds number for flow in a pipe and find out whether the flow is laminar, transitional or turbulent.
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Pipe pressure drop calculator (Darcy–Weisbach)
Estimate the frictional pressure drop of a liquid in a straight pipe from flow rate, diameter, length, density, viscosity and roughness.
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Equipment
Pump power calculator
Calculate hydraulic, shaft and motor input power of a centrifugal pump from flow, head, fluid density and efficiencies.
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Tank volume calculator: horizontal and vertical cylinders
Calculate the total volume of a cylindrical tank and the volume of liquid at a given level, in m³, barrels and gallons.
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Process safety
For education and quick estimates only. Check the result against the applicable standards and your project data before using it in design, operation or safety decisions.
Looking for checklists, worksheets and templates? See the free downloads.