A worked example
Brown, black, red, gold means 10 × 100 = 1,000 Ω, ±5%.
VOLTKIND / EVERYDAY TOOLS
A clearer circuit.One component at a time.
Read a resistor, combine a network and see how a small circuit behaves. Four practical tools with visible formulas and live diagrams.
Make a little plan✓ Free to use✓ No uploads✓ Ready to print
MEASURE / PLAN / MAKEA clearer plan starts here.
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YOUR LITTLE WORKBENCH
Resistor colors
Start with an example and change it to your setup. Results update as you type.
Calculation method+
Resistance = significant digits × 10^multiplier. Four bands use two digits; five bands use three.
YOUR LIVE RESULT ✦
Nominal resistance
1,000 Ω- Tolerance
- 5 %
- Minimum value
- 950 Ω
- Maximum value
- 1,050 Ω
The first significant digit must be nonzero. Tolerance is decoded from its own band and is not a measured component value.
THE METHOD / 01
Know what goesinto your result.
Resistance = significant digits × 10^multiplier. Four bands use two digits; five bands use three.
Keep the assumptions clear
The first significant digit must be nonzero. Tolerance is decoded from its own band and is not a measured component value.
A FEW USEFUL ANSWERS
Good to know.
Are my inputs uploaded?
No. Calculations run locally in your browser. The host still receives normal requests for website pages and assets.
Can I keep my result?
Use the download controls for the current tool or print from your browser. Typing scores and camping plans can also be saved locally; see the privacy page for details.
Do I need an account?
No sign-up, paid API or subscription is required. Both language versions use the same calculation logic.
VOLTKIND / TOOLKIT
A little help for every step.
01
Resistor colors
Decode four- or five-band resistors with a labeled color diagram and tolerance range.
Open tool02
Resistor network
Calculate series and parallel equivalents for a list of positive resistance values.
Open tool03
Voltage divider
Calculate unloaded or resistively loaded output voltage with current and resistor power estimates.
Open tool04
RC time constant
Plot ideal charging or discharging and calculate voltage at a chosen time.
Open tool