Calculators
Flow Measurement Calculators
DP meters, open channel flow, gas conversions, pressure drop and meter sizing. Every tool shows the formula, a worked example and the standard it is based on.
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All Flow Measurement Tools
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DP Meters11
DP MetersOrifice Plate Flow Calculator (ISO 5167)ISO 5167-2, Liquid and gasDP MetersOrifice Plate Bore Sizing CalculatorISO 5167-2, Bore and β ratioDP MetersVenturi Tube Flow CalculatorISO 5167-4, Liquid and gasDP MetersPitot Tube Velocity CalculatorDynamic pressure, VelocityDP MetersFlow Nozzle Flow CalculatorISO 5167-3, ISA 1932DP MetersDP Flow Transmitter Rerange CalculatorSquare root law, Orifice and venturiDP MetersOrifice Permanent Pressure Loss CalculatorISO 5167-2, Permanent pressure lossDP MetersRestriction Orifice Sizing CalculatorRestriction orifice, Choked gas flowDP MetersCone (V Cone) Flow Meter CalculatorISO 5167-5, Cone meterDP MetersAveraging Pitot Tube (Annubar Type) Flow CalculatorAveraging pitot, Flow coefficient KDP MetersDP Flow Measurement Uncertainty Calculator (ISO 5167)ISO 5167-1, Uncertainty budget
Flow Meters13
Flow MetersFlow Meter K Factor CalculatorFrequency to rate, Pulses to totalFlow MetersFlow Meter Turndown Ratio CalculatorTurndown ratio, DP metersFlow MetersMagnetic Flow Meter Sizing CalculatorDN 10 to DN 600, Velocity checkFlow MetersFlow Meter Straight Pipe Run CalculatorUpstream D, Downstream DFlow MetersFlow Totalizer and Fill Time CalculatorTotal volume, Fill timeFlow MetersVortex Flow Meter CalculatorStrouhal number, K factorFlow MetersUltrasonic Transit Time Flow CalculatorTransit time, Clamp onFlow MetersRotameter Correction CalculatorVariable area, Liquid densityFlow MetersFlow Meter Accuracy Calculator% of rate, % of full scaleFlow MetersTank Level Rate to Flow CalculatorLevel change, Net flowFlow MetersFlowmeter Bucket and Stopwatch Test CalculatorBucket test, Meter errorFlow MetersFlow Meter Factor and K Factor Correction CalculatorMeter factor, ProverFlow MetersLaminar Flow Element and Capillary Flow CalculatorHagen Poiseuille, Capillary
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Gas Flow7
Gas FlowStandard to Actual Gas Flow CalculatorNm³/h, Sm³/hGas FlowGas Density Calculatorρ = PM/ZRT, Molecular weightGas FlowMass Flow to Volume Flow Calculatorkg/h to m³/h, m³/h to kg/hGas FlowGas Flow Pressure and Temperature CompensationDP meters, Pressure correctionGas FlowGas Flow to Energy CalculatorCalorific value, kW and MMBtu/hGas FlowGas Pipeline Pressure Drop Calculator (Isothermal)Compressible flow, IsothermalGas FlowGas Velocity and Mach Number CalculatorActual velocity, Mach number
Pipe Flow11
Pipe FlowPipe Flow Velocity CalculatorNPS Sch 40 and 80, Flow to velocityPipe FlowReynolds Number CalculatorLaminar or turbulent, Velocity or flowPipe FlowPipe Pressure Drop CalculatorDarcy Weisbach, Friction factorPipe FlowPipe Sizing Calculator (Flow and Velocity)Flow to diameter, NPS Sch 40 and 80Pipe FlowDarcy Friction Factor Calculator (Colebrook)Colebrook White, Swamee JainPipe FlowTank Drain Time CalculatorTorricelli, Gravity drainPipe FlowRectangular Duct Flow and Hydraulic Diameter CalculatorHydraulic diameter, Equivalent diameterPipe FlowPitot Traverse Points and Average Velocity CalculatorLog Tchebycheff, Traverse pointsPipe FlowHazen Williams Water Pipe Head Loss CalculatorHazen Williams, C factorPipe FlowErosional Velocity Calculator (API RP 14E)API RP 14E, ErosionPipe FlowPipe Flow Capacity from Pressure Drop CalculatorDarcy Weisbach, Allowable ΔP
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Pumps4
Open Channel4
Frequently Asked Questions
Are these flow measurement calculators free?
Yes. All calculators on instrumentationblog.in are free, run in your browser and need no sign up.
How accurate are the flow measurement calculators?
Each tool follows the published standard or textbook equation for its topic, shows the formula and the calculation steps, and has been checked against worked examples. Always confirm critical designs against the relevant standard and manufacturer data.
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