Fluids Converters

About Fluid Converters

Fluids behave differently from solids — they flow, mix, resist shear, and form surfaces that pull inward — and describing that behavior precisely requires its own family of physical quantities. UnitConvertersLab's Fluids Converters bring together ten specialized calculators for the properties fluid mechanics, chemical engineering, and process industries work with every day: volumetric flow, mass flow, molar flow, mass flux density, molar concentration, solution concentration, dynamic viscosity, kinematic viscosity, surface tension, and permeability.

The Flow converter handles volumetric flow rate — how much volume of a fluid passes a point per unit time — across dozens of units spanning cubic meters, liters, gallons (both US and UK), barrels, and specialized oilfield and industrial units like kilobarrel/day and acre-foot/year. Flow - Mass and Flow - Molar complement it by measuring, respectively, how much mass and how many moles of a substance move per unit time, essential when a process depends on the amount of material delivered rather than its volume (which can change with temperature and pressure). Mass Flux Density takes this a step further, describing mass flow per unit of cross-sectional area — a key quantity in heat exchanger and filtration design.

Concentration - Molar and Concentration - Solution cover how much of a substance is dissolved or dispersed in a fluid, using molar units (mol per cubic meter or liter) and mass-based or parts-per-million units respectively — fundamental to chemistry, water treatment, and environmental monitoring. Viscosity - Dynamic and Viscosity - Kinematic describe a fluid's resistance to flow: dynamic viscosity relates shear stress to shear rate (in pascal-seconds or poise), while kinematic viscosity is dynamic viscosity divided by density (in square meters per second or stokes) — both essential for lubricant selection, pipe flow calculations, and pump sizing.

Surface Tension measures the cohesive force at a liquid's surface that lets it resist external force, relevant to everything from soap bubbles to inkjet printing to fuel injector design. Permeability describes how easily fluid can pass through a porous material, a property central to groundwater hydrology, oil and gas reservoir engineering, and filtration system design.

Every converter on this page works the same way: pick a "from" unit and a "to" unit from the dropdown lists, type in a value, and get an instantly calculated, high-precision result — up to 12 significant digits — with no account required and nothing to install. Each tool is optimized for desktop and mobile alike, so you can pull up a quick conversion in the field, the lab, or the classroom.

These ten categories were chosen because fluid-related quantities are notoriously inconsistent across unit systems and industries — a US oilfield report in barrels per day, a European chemical process spec in cubic meters per hour, and a physics textbook in SI units all describe the same physical reality in different numbers. Rather than tracking down conversion factors from scattered references, you can get an exact, trustworthy answer here in seconds.

Our converters are perfect for:

• Students and educators needing quick, dependable answers for coursework and exams
• Chemical, mechanical, and civil engineers converting between metric and imperial process specifications
• Technicians and plant operators checking flow, viscosity, and concentration readings against equipment datasheets
• Hobbyists and researchers working with fluid properties in the lab or field

Whether you're sizing a pump, converting a lab concentration result, or checking a viscosity grade against a lubricant spec sheet, UnitConvertersLab's Fluids Converters are designed to be fast, accurate, and trustworthy. All conversion factors are drawn from standard, internationally recognized unit definitions, so you can rely on the same numbers used in textbooks, datasheets, and professional practice — anytime, on any device.