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Resistor Series & Parallel Calculator

Science & Engineering

Equivalent resistance comparison

Quick Answer

Resistor Series & Parallel Calculator: Equivalent resistance comparison. Resistor Series & Parallel Calculator uses standard science & engineering formulas to compute accurate results instantly.

Series total300.0000Ω
Parallel total66.6667Ω
最小电阻100.0000Ω
并联/最小值66.7%

Calculation steps

  1. 1Series: 100 + 200 = 300.0000 Ω
  2. 2Parallel: 1/R = 1/100 + 1/200 = 0.015000
  3. 3Take reciprocal: R = 66.6667 Ω (always less than the smallest resistor 100.0000 Ω)

E24 standard values (×10ⁿ Ω)

11.11.21.31.51.61.82
2.22.42.733.33.63.94.3
4.75.15.66.26.87.58.29.1
Series resistance adds up (voltage divider); parallel resistance is always below the smallest branch (current divider). Two equal resistors in parallel give exactly half. Need a non-standard value? Combine E24 values in series or parallel — e.g. 500Ω = two 1kΩ in parallel.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Resistor Series & Parallel 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

  • Resistor Series & Parallel 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: Equivalent resistance comparison.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Resistor Series & Parallel Calculator formula

Resistor Series & Parallel Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Resistor Series & Parallel Calculator?
Open the page and fill in the input fields — results update automatically. Equivalent resistance comparison.
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. Resistor Series & Parallel Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/resistor

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