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Viscosity and Reynolds Number Calculator
Compute the Reynolds number for flow in a pipe and classify it as laminar or turbulent.
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Reynolds number
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Compute the Reynolds number for flow in a pipe and classify it as laminar or turbulent.
Viscosity and Reynolds Number Estimator
Enter your numbers below for an instant estimate.
0
๐ก Tip: Re = density x velocity x diameter / dynamic viscosity.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Viscosity Quick Guide
Typical values for reference.
| Density | Viscosity | Velocity | Re |
|---|---|---|---|
| 998 | 1 | 0.01 | 499 |
| 998 | 1 | 0.1 | 4,990 |
| 998 | 1 | 1.5 | 74,850 |
| 998 | 1 | 5 | 249,500 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Viscosity and Reynolds Calculator FAQ
Answers to common questions about this calculator.
A ratio of inertial to viscous forces in flow.
About 2,300 and 4,000 for pipes.
A fluid resistance to shear.
Yes, viscosity changes strongly.