Resistor Value Calculator
Resistance from band values and tolerance.
Enter your values
Enter the first digit you are working with.
Enter the second digit you are working with.
Enter the multiplier power you are working with.
Enter the tolerance in %.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Resistance
- 47 kΩ
- Tolerance range
- 44650 – 49350 Ω
- Exact value
- 47,000 Ω
- Tolerance
- 5%
Quick answer
Resistor value is the significant digits multiplied by the multiplier band.
R = digits × 10^multiplier
At a glance
| What it does | Resistance from band values and tolerance. |
|---|---|
| Category | Engineering |
| Inputs needed | First digit, Second digit, Multiplier power, Tolerance |
| Main output | Resistance |
| Formula | R = digits × 10^multiplier |
| Cost | Free — no sign-up, no download |
How to use the Resistor Value Calculator
- 1Enter the first two band digits.
- 2Enter the multiplier band as a power of ten.
- 3Set the tolerance band percentage.
Inputs explained
- First digit
- Enter the first digit you are working with.
- Second digit
- Enter the second digit you are working with.
- Multiplier power
- Enter the multiplier power you are working with.
- Tolerance(%)
- Enter the tolerance in %.
Worked example
Using the values the calculator loads with:
Inputs
- First digit4
- Second digit7
- Multiplier power3
- Tolerance5 %
Results
- Resistance47 kΩ
- Tolerance range44650 – 49350 Ω
- Exact value47,000 Ω
- Tolerance5%
Frequently asked questions
What colour is multiplier 3?
Orange — 4, 7, orange gives 47 kΩ.
Why does tolerance matter?
In timing and divider circuits a 5% part can shift behaviour noticeably.
What do I need to enter into the Resistor Value Calculator?
Just 4 values: first digit, second digit, multiplier power, tolerance. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Resistor Value Calculator work out the answer?
Resistor value is the significant digits multiplied by the multiplier band. It applies the formula R = digits × 10^multiplier and shows the working so you can check each step by hand.
Is the Resistor Value Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.