MAXScanner thermal & fluid engineering
Mass Flow Rate Calculator — Density, Velocity, Area & Volumetric Flow
Calculate mass flow from density and volumetric flow, or density, velocity and cross-sectional area; see equivalent volumetric flow.
Last updated: September 17, 2026
Results
Enter positive density
Formula, example and assumptions
ṁ=ρQ=ρAv.
Water at 1000 kg/m³ flowing at 0.01 m³/s has mass flow 10 kg/s.
- Density is treated as uniform across the section.
- Velocity mode uses the entered mean cross-sectional velocity.
Frequently asked questions
Mass flow vs volumetric flow?
Mass flow tracks mass per time; volumetric flow tracks volume per time and they are related by density.
Can I use gas density?
Yes, if the density corresponds to the actual pressure and temperature at the section.