Must have in HDD
Response from developer
Thank you! We’re happy to know it’s proving valuable for HDD professionals.

This app helps Horizontal Directional Drilling professionals optimize hydraulic energy for efficient cuttings removal. It calculates key parameters to improve tool cleaning, reduce wear, and maximize bearing life. Features include comprehensive calculations, side-by-side case comparisons, and dynamic charting.
1.0.1
November 12, 2025
UI and performance improvements across app.
Thank you! We’re happy to know it’s proving valuable for HDD professionals.
Inrock HDD HydroCalc instantly computes Delta P, Jet Velocity, and material displacement. This is achieved by inputting pilot hole diameter, reaming diameter(s), mud weight, flow rate, and jet sizes.
By efficiently calculating hydraulic energy for cuttings removal, the app improves tool cleaning, reduces re-grinding of cuttings, and minimizes the risk of pack-off and balling-up. This allows tools to achieve their full bearing life potential.
Yes, the app features a Case Comparison function that allows you to perform two simultaneous calculations. This enables you to effectively compare different scenarios side by side for better decision-making.
Absolutely. The app offers Unit Conversion Flexibility, allowing you to switch between metric and US customary units effortlessly. All input and output values automatically convert when you toggle between units.
Inrock HDD HydroCalc features a user-friendly interface designed for efficiency and accuracy. It is organized into three intuitive screens: Calculator, Chart, and Settings.
Yes, Inrock HDD HydroCalc is supported on iPhone and iPad devices, making it accessible for professionals on the go.
The latest version, 1.0.1, was released on November 12, 2025. While specific update frequency isn't detailed, the app is actively maintained by Inrock Drilling Systems.
No, Inrock HDD HydroCalc does not contain advertisements. It is a free application designed to provide professional tools without interruption.