Skin Friction Estimator
Estimate flat-plate skin-friction drag with laminar and turbulent coefficient correlations.
Blended Cf
0.002946
skin-friction coefficient
Skin-friction drag
736.50 N
q Swet Cf
Equivalent CD
0.00921
referenced to planform area
Skin-friction build-up
The visualization shows where the plate is treated as laminar or turbulent before the coefficient is scaled by wetted area.
Re 1.00e7
Correlation blend
Cf 0.002946
100% turbulent weighting
Equivalent drag
CD 0.00921
skin friction scaled to reference area
Skin-friction drag
736.5 N
dynamic pressure times wetted area times Cf
Open Source and Easy to Use Elsewhere
This tool is open source and the underlying logic is fully transparent. You can inspect the code, understand the calculations, and contribute improvements. If you want to use the tool in your own website, course page, or learning platform, you can also embed it directly and start from a ready-made iframe setup for this exact tool.
Open source: review the implementation and see how the results are produced.
Embeddable: preview this tool, copy the iframe, and use it in your own site or LMS.