Flow Rate & Fluid Mechanics Converters
Rigorous fluid dynamics and industrial metrology calculation engines spanning volumetric flow (CFM, L/min, m³/h, L/s, m³/min, mm³/min, US/Imperial gallons/day), dynamic viscosity and rheology (centipoise, millipascal-seconds, pascal-seconds, kg/(m·s)), and industrial continuous mass flow rates (lb/h, kg/h, metric tonnes per year to daily short/long tons). Verified against ISO 80000-4, NIST SP 811, and ASME fluid metering standards.
CFM to Liters per Minute Converter
High-precision interactive HVAC and piping airflow calculation engine with ACFM/SCFM gas state normalization and cross-dimensional mass flow modeling.
Mass Flow = Density × Volumetric Flow (˙m = ρQ)
🔥 Most Popular Flow Rate & Fluid Mechanics Calculators
Complete 3-Group Flow Rate & Fluid Directory
Every source entry accounted for across Volumetric Flow, Rheological Dynamic Viscosity, and Continuous Industrial Mass Flow. Genuine SEO aliases are consolidated into canonical calculators with prominent alias badges and 0 dropped entries.
Group A — Volumetric Flow Rate Conversions (CFM, L/min, m³/h, L/s, m³/min, mm³/min, Gallons/day) 8 Entries
Mode: cfm-to-liters-per-minute • Units: cfm → l_min
Mode: cfm-to-cubic-meters-per-hour • Units: cfm → m3_h
Mode: liters-per-second-to-cubic-meters-per-minute • Units: l_s → m3_min
Resolved to canonical cfm-to-cubic-meters-per-hour to prevent keyword cannibalization.
Mode: gallons-per-day-to-cubic-millimeters-per-minute • Units: gal_day_us → mm3_min
Mode: liters-per-minute-to-cfm • Units: l_min → cfm
Mode: liters-per-second-to-cfm • Units: l_s → cfm
Mode: cubic-meters-per-minute-to-cfm • Units: m3_min → cfm
Group B — Dynamic Viscosity & Fluid Rheology (Centipoise, Millipascal-seconds, Pascal-seconds, kg/(m·s)) 5 Entries
Mode: centipoise-to-pascal-seconds • Units: cp → pa_s
Mode: millipascal-seconds-to-centipoise • Units: mpa_s → cp
Mode: centipoise-to-millipascal-seconds • Units: cp → mpa_s
Resolved to canonical centipoise-to-millipascal-seconds to prevent keyword cannibalization.
Mode: centipoise-to-kg-per-meter-second • Units: cp → kg_m_s
Group C — Industrial Mass Flow & Commodity Bulk Rates (lb/h, kg/h, Metric Tonnes/year to Tons/day) 3 Entries
Mode: pounds-per-hour-to-kilograms-per-hour • Units: lb_h → kg_h
Mode: metric-tonnes-per-year-to-tons-per-day • Units: t_day → ton_us_day
Resolved to canonical pounds-per-hour-to-kilograms-per-hour to prevent keyword cannibalization.
Volumetric Flow Rate SI & Imperial Unit Conversions
Volumetric flow rate measures volume transported through a defined cross-section per unit time ($Q = V / t$). The table below illustrates exact cross-unit relationships normalized against 1 cubic foot per minute (1 CFM):
| Base Unit | Symbol | SI Equivalent (m³/s) | Equiv in 1 CFM | Liters/min (L/min) |
|---|---|---|---|---|
| Cubic Foot per Minute | CFM (ft³/min) | 4.719474 × 10⁻⁴ m³/s | 1.000000 CFM | 28.31685 L/min |
| Liter per Minute | L/min (LPM) | 1.666667 × 10⁻⁵ m³/s | 0.035315 CFM | 1.00000 L/min |
| Cubic Meter per Hour | m³/h (CMH) | 2.777778 × 10⁻⁴ m³/s | 0.588578 CFM | 16.66667 L/min |
| Liter per Second | L/s | 1.000000 × 10⁻³ m³/s | 2.118880 CFM | 60.00000 L/min |
| Cubic Meter per Minute | m³/min | 1.666667 × 10⁻² m³/s | 35.31467 CFM | 1,000.00 L/min |
| US Gallon per Minute | GPM (US) | 6.309020 × 10⁻⁵ m³/s | 0.133681 CFM | 3.78541 L/min |
| US Gallon per Day | gal/day (US) | 4.381264 × 10⁻⁸ m³/s | 9.283375 × 10⁻⁵ CFM | 2.62876 × 10⁻³ L/min |
Dynamic Viscosity Equivalencies & Common Fluid Benchmarks (20°C)
Dynamic shear viscosity ($\mu$) represents internal fluid friction under applied shear stress ($\tau = \mu \cdot \dot{\gamma}$). The identity $1\text{ cP} \equiv 1\text{ mPa}\cdot\text{s} \equiv 0.001\text{ Pa}\cdot\text{s} \equiv 0.001\text{ kg}/(\text{m}\cdot\text{s})$ is exact.
| Benchmark Substance | Centipoise (cP) | Millipascal-sec (mPa·s) | Pascal-sec (Pa·s) | Density (kg/m³) | Kinematic (cSt) |
|---|---|---|---|---|---|
| Air (dry, 1 atm, 20°C) | 0.0182 cP | 0.0182 mPa·s | 1.82 × 10⁻⁵ Pa·s | 1.204 kg/m³ | 15.12 cSt |
| Water (pure distilled, 20°C) | 1.002 cP | 1.002 mPa·s | 1.002 × 10⁻³ Pa·s | 998.2 kg/m³ | 1.004 cSt |
| Liquid Mercury (pure, 20°C) | 1.554 cP | 1.554 mPa·s | 1.554 × 10⁻³ Pa·s | 13,546 kg/m³ | 0.115 cSt |
| Olive Oil (pure, 20°C) | 84.0 cP | 84.0 mPa·s | 0.084 Pa·s | 915.0 kg/m³ | 91.8 cSt |
| Motor Oil (SAE 30, 20°C) | 200.0 cP | 200.0 mPa·s | 0.200 Pa·s | 880.0 kg/m³ | 227.3 cSt |
| Pure Glycerol (100%, 20°C) | 1,412.0 cP | 1,412.0 mPa·s | 1.412 Pa·s | 1,261.0 kg/m³ | 1,119.7 cSt |
| Clover Honey (pure, 20°C) | 10,000.0 cP | 10,000.0 mPa·s | 10.000 Pa·s | 1,420.0 kg/m³ | 7,042.3 cSt |
⚠ Critical Fluid Dynamics Distinctions
mPa·s utilizes lowercase m for milli ($10^{-3}$), which is exactly equal to 1 centipoise (cP). Capital MPa·s denotes megapascal-seconds ($10^6\text{ Pa}\cdot\text{s}$), a colossal one-billion-fold ($10^9$) difference. Always verify casing in laboratory and engineering specifications.
Frequently Asked Questions on Flow & Fluid Mechanics
How do I convert volumetric flow rate (CFM) to mass flow rate (lb/h or kg/h)?
Conversion between volumetric flow ($Q$) and mass flow ($\dot{m}$) requires the fluid's mass density ($\rho$) under specific operating conditions: $\dot{m} = \rho \times Q$. For standard dry air at 20°C and 101.325 kPa ($\rho \approx 1.2041\text{ kg/m}^3 \approx 0.07517\text{ lb/ft}^3$), 1 CFM equates to approximately $4.51\text{ lb/h}$ ($2.046\text{ kg/h}$). For liquids like water ($\rho \approx 1000\text{ kg/m}^3$), 1 CFM corresponds to approximately $1,699\text{ kg/h}$ ($3,745.7\text{ lb/h}$).
Why is 1 centipoise exactly equal to 1 millipascal-second?
The poise (P) is the CGS unit of dynamic viscosity defined as $1\text{ dyn}\cdot\text{s/cm}^2 = 0.1\text{ Pa}\cdot\text{s}$. A centipoise (cP) is one-hundredth of a poise ($0.01\text{ P} = 0.001\text{ Pa}\cdot\text{s}$). In the International System of Units (SI), one millipascal-second is also one-thousandth of a pascal-second ($1\text{ mPa}\cdot\text{s} = 0.001\text{ Pa}\cdot\text{s}$). Because both equal exactly $10^{-3}\text{ Pa}\cdot\text{s}$, 1 cP is mathematically identical to 1 mPa·s.
What is the difference between US liquid gallons per day and Imperial gallons per day?
A US liquid gallon is legally defined as exactly 231 cubic inches ($3.785411784\text{ liters}$), whereas an Imperial (British) gallon is defined as exactly $4.54609\text{ liters}$ (approximately 20% larger). When converting gallons per day into cubic millimeters per minute ($\text{mm}^3/\text{min}$), 1 US gal/day yields $2,628.76\text{ mm}^3/\text{min}$, while 1 Imperial gal/day yields $3,157.01\text{ mm}^3/\text{min}$.
How does calendar year length affect metric tonnes per year to tons per day calculations?
In bulk industrial processing, annual capacities are expressed over 365.0 days (standard financial accounting), 365.2425 days (Gregorian mean astronomical year), or 366 days (leap year). Furthermore, the target ton must be distinguished: a US short ton is $2,000\text{ lbs}$ ($907.185\text{ kg}$), while an Imperial long ton is $2,240\text{ lbs}$ ($1,016.047\text{ kg}$) and a metric tonne is $1,000\text{ kg}$. ConverterForUnits.com provides explicit controls for both ton standard and calendar year basis.