Weerstandscalculator

Decode resistor color codes, calculate series and parallel resistance, and find power dissipation. Free, fast, and easy to use.

Berekenen

Choose a calculation type, enter your values or select color bands, and click Calculate Now to get instant results with step-by-step solutions.

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Wat is een weerstand?

A resistor is an electrical component that limits or controls the flow of electric current in a circuit. Resistance is measured in ohms (Ω) and is usually shown by colored bands on the resistor body. This tool helps you decode those color bands, combine resistors in series or parallel, and calculate power dissipation — all for free.

All Formulas at a Glance

Kleurcode: R = (digits) × multiplier ± tolerance%

Serie: R_total = R1 + R2 + R3 + …

Parallel: 1/R_total = 1/R1 + 1/R2 + 1/R3 + …

Stroom: P = V² / R  |  I = V / R

4 Calculation Types

Kleurcode

Decodeer de weerstand van 4-bands, 5-bands of 6-bands kleurcodes op een weerstand.

Serie weerstand

Calculate total resistance when resistors are connected end to end.

Parallelle weerstand

Calculate total resistance when resistors are connected side by side.

Vermogensdissipatie

Zoek hoeveel vermogen een weerstand dissipeert met behulp van spanning en weerstand.

Hoe deze rekenmachine te gebruiken

  1. Kies wat u wilt berekenen: kleurcode, serie, parallel of macht.
  2. Enter resistor values or select color bands.
  3. Kies indien nodig eenheden (ohm, kilohm, megaohm).
  4. Click Calculate Now and see your answer with a step-by-step breakdown and chart.

Resistor Color Code Chart

• Black=0, Brown=1, Red=2, Orange=3, Yellow=4

• Green=5, Blue=6, Violet=7, Gray=8, White=9

• Gold multiplier = ×0.1, Silver multiplier = ×0.01

• Tolerantie: Bruin ±1%, Rood ±2%, Goud ±5%, Zilver ±10%

Quick Examples

• Bruin-zwart-rood-goud = 10 × 100 = 1000 Ω (1 kΩ) ±5%

• Twee weerstanden van 100 Ω in serie = 200 Ω

• Twee weerstanden van 100 Ω parallel = 50 Ω

• 12 V over 100 Ω = 1,44 W vermogensverlies

Belangrijke opmerkingen

  • All resistance values must be greater than zero.
  • Color bands are read from left to right — the tolerance band is usually gold or silver.
  • Unit conversions are done automatically — just pick your preferred unit.
  • At least two resistors are needed for series and parallel calculations.

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