Skip to content

Free calculator, no sign-up

Pulley system calculator: line pull of a block and tackle

Pull on the free end of a block and tackle or chain hoist with n load-bearing falls, sheave efficiency included, in newtons and kilograms. Free.

  • Instant result
  • Formula and standards shown
  • On desktop and phone

Pre-filled example

A one-tonne load on four load-bearing falls, with an overall efficiency of 0.9.

kg

Result

2,724NPull on the free rope

Rope pull, in kg
277.8kg
  • Caution : The WLL of the hoist and its accessories prevails over this calculation.
Attach this calculation to a work order

Free during the beta, no credit card

Does not replace the marked WLL or the manufacturer's value.

Line pull recorded with the maintenance lift

Here, the calculator is free and the result is gone when you close the page. In Reglova, it is attached to the work order on the right machine: you find it again at the next breakdown, and on audit day.

The CMMS software comparison, our gaps included
  • Attached to the work order with its inputs: the server recalculates it, it stays verifiable.
  • On the technician's phone, even without a network.
  • In the machine's history, for the next breakdown.
Try the demoJoin the free beta
Reglova · Calculations · Work order WO-AT01-04219
Silent video, 33 s: from the work order for an oil leak on a shear cylinder, the tightening torque of an M12 bolt, then "Attach to the work order". A step to tighten it to 93.1 N·m lands in the checklist (step text from the French demo data). Watch the video

When to calculate the pull of a hoist

  1. 01

    Choose a manual chain hoist or a pulling hoist for a maintenance lift.

  2. 02

    Check that a winch can take the line pull of a reeving arrangement.

  3. 03

    Show why four falls do not quite divide the load by four.

Good to know

The working load limit of the hoist, the hook and the accessories prevails over this calculation: it does not replace it.

Block and tackle formula: F = m·g/(n·η)

Reeving spreads the load over several falls, but each sheave costs a little efficiency. The calculator gives the pull to apply on the free end, F = m·g/(n·η), in newtons and as a mass equivalent.

Formula · Reference documents

F = m·g/(n·η)

Lifting: n load-bearing falls, overall efficiency η

Inputs and accepted ranges
InputUnitAccepted rangeExample
Load masskg0.1 to 500,0001,000 kg
Number of falls1 to 244
Reeving efficiency η0.1 to 10.9
Calculated results
  • Pull on the free ropeN
  • Rope pull, in kgkg
What the calculator flags
  • The WLL of the hoist and its accessories prevails over this calculation.

Hoists and lifting accessories inspected on schedule

  • Breakdowns reported by QR code
  • Work orders on the phone, even without a network
  • Mandatory inspections reminded by email
  • Audit file as a PDF, in one click
Try the demoJoin the free beta

Free during the beta, no credit card