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Hydraulic hose sizing & flow velocity calculator

Enter flow rate and line type to find ideal inner diameter, match standard dash sizes, and evaluate velocity safety.

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How to use Hydraulic hose sizing& flow velocity calculator

  1. Enter System flow rate (L/min) and adjust the options as needed.
  2. Run the tool and inspect its results, evidence and limitations.
  3. Copy or download the result, then verify it against the actual website, source data or business records.

Try a concrete example

A 60 L/min pressure line recommends Dash -08 (nominal 1/2", ~12.7mm ID) with an actual velocity of ~7.89 m/s.

How to interpret results

Uses V = 21.22 × Q / d² to match SAE J517 / ISO dash sizes. Verify bend radius and burst pressure for extreme pulsation.

Frequently asked questions

What do hose Dash sizes (-04, -06, -08, -12) mean?

Dash sizes indicate sixteenths of an inch: -04 is 1/4" (6.3mm), -06 is 3/8" (9.5mm), -08 is 1/2" (12.7mm), -12 is 3/4" (19mm), -16 is 1" (25.4mm).

Why must suction line velocity stay under 1.2 m/s?

Suction lines rely on atmospheric pressure. Excessive velocity creates vacuum drop, causing dissolved air to implode (cavitation), destroying pump elements.

What happens if pressure line velocity is too high?

High velocity causes friction pressure drop converted to intense heat, degrading seals and causing fatigue vibration.

How to determine the required hose working pressure?

Inner diameter sets velocity; reinforcement plies set working pressure. Verify SAE 100R2/100R12 or DIN standards with a 4:1 safety factor.

hydraulic hose sizing calculator practical guide and common questions

What does a hydraulic hose sizing calculator do?

Hose sizing uses fluid continuity equations to calculate recommended inner diameter from flow rate and velocity, matching standard SAE/ISO dash sizes.

Who is this for, and when is it useful?

Mechanical engineers and procurement teams selecting hose lines and dash sizes for hydraulic power units after flow rate is known.

How do I use this hydraulic hose sizing calculator?

Enter system flow rate and line application to find ideal diameter, match standard dash sizes, and evaluate velocity safety against cavitation.

How should I interpret the results?

Suction velocity must remain low to prevent pump cavitation, while excessive pressure line velocity causes severe friction heat. Verify reinforcement plies and bend radius against system working pressure.

Where is the work performed, and which services receive data?

Flow velocity and hose dash size matching execute locally in your browser. System flow parameters are not submitted to any external server.