Construction Machinery & Attachments calculator
Hydraulic Flow Requirement Calculator
Use this calculator to check whether a carrier auxiliary circuit can support a breaker, mulcher, auger, trencher, broom, grapple, or other hydraulic attachment.
What this calculator does
- Estimate hydraulic flow demand for construction attachments from tool flow, duty multiplier, and operating time.
- screening attachment compatibility with carrier hydraulic flow capacity
- The result estimates adjusted gallons per minute required by the attachment.
Formula used
- Adjusted hydraulic flow requirement = attachment rated hydraulic flow × duty cycle and pressure-loss multiplier
- Compare adjusted flow requirement to carrier continuous auxiliary flow and cooling capacity.
Inputs explained
- Hydraulic Flow Requirement input load: undefined
- Hydraulic Flow Requirement load factor: undefined
- Hydraulic Flow Requirement operating time: undefined
How to use the result
- Use it to confirm carrier compatibility, identify overheating risk, size hoses/couplers, and avoid quoting an attachment the machine cannot run.
- Treat the result as a planning estimate until it is checked against OEM machine charts, attachment manuals, hydraulic specifications, site conditions, material density, operator performance, maintenance history, rental terms, freight constraints, and actual jobsite production or shop data for the same machine class.
Common questions
- What is the hydraulic flow requirement calculator for? Use this calculator to check whether a carrier auxiliary circuit can support a breaker, mulcher, auger, trencher, broom, grapple, or other hydraulic attachment.
- What information should I enter? Enter attachment rated hydraulic flow, duty cycle and pressure-loss multiplier, and operating time for the attachment duty cycle or work window being checked.
- What does the result tell me? The result estimates adjusted gallons per minute required by the attachment.
- When is the result only an estimate? Treat the result as a planning estimate until it is checked against OEM machine charts, attachment manuals, hydraulic specifications, site conditions, material density, operator performance, maintenance history, rental terms, freight constraints, and actual jobsite production or shop data for the same machine class.
Last reviewed 2026-05-12.