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Pulley Calculator

Science & Engineering

Force saving, mechanical efficiency

Quick Answer

Pulley Calculator: Force saving, mechanical efficiency. Pulley Calculator uses standard science & engineering formulas to compute accurate results instantly.

N
N
m
Ideal pulling force
200.0 N
Rope end travels 6.0 m · Efficiency 87.0%
Force saved3×
Distance traded3×
Efficiency η87.0%

Calculation steps

  1. 1Ideal: F = G/n = 600/3 = 200.0 N
  2. 2Rope pulled s = n×h = 3×2 = 6.0 m
  3. 3Efficiency η = W_useful/W_total = G×h/(F×s) = G/(nF) = 600/(3×230) = 87.0%
  4. 4Extra force vs ideal: 15.0% (friction + moving pulley weight)

Strands vs force (G = 600 N)

Strands nIdeal FRope for 1 m lift
1600 N1 m
2300 N2 m
3200 N3 m
4150 N4 m
5120 N5 m
6100 N6 m
Count only strands attached to the MOVING pulley (n). A fixed pulley alone (n=1) saves no force — it just redirects. Real efficiency is typically 80–95% per stage because of friction and the movable pulley own weight; adding more strands trades ever longer rope travel for less force.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Pulley Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Pulley Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Force saving, mechanical efficiency.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Pulley Calculator formula

Pulley Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Pulley Calculator?
Open the page and fill in the input fields — results update automatically. Force saving, mechanical efficiency.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Pulley Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/pulley

Results provided by this tool are for reference only and do not constitute professional advice.