Computer & Electronics Calculators
Free online calculators and converters for electronics engineering, RF power calculations, number systems, and data storage units.
RF Power Calculators
Convert between watts, milliwatts, dBm (decibel-milliwatts), and dBW (decibel-watts) for RF engineering and telecommunications.
mW / W to dBm / dBW Calculator
Convert milliwatts or watts to decibel-milliwatts (dBm) or decibel-watts (dBW). Essential for RF signal power calculations.
- Formula: P(dBm) = 10 · log₁₀(P(mW) / 1mW)
- Instant conversion with step-by-step explanation
dBm / dBW to mW / W Calculator
Convert decibel-milliwatts (dBm) or decibel-watts (dBW) back to linear power units (mW or W).
- Formula: P(mW) = 1mW · 10^(P(dBm)/10)
- Useful for link budget calculations
mW to dBm Reference Table
Quick reference chart for common milliwatt to dBm conversions from 0.01 mW to 10 GW.
- Complete conversion table
- Formula explanation and examples
Electrical Calculators
Calculate voltage, current, power, and resistance using Ohm's Law and the power formula.
Volts, Amps, Watts & Ohms Calculator
Complete electrical calculator using Ohm's Law. Enter any two values to calculate the other two.
- V = I × R (Ohm's Law)
- P = V × I (Power formula)
- Interactive power wheel diagram
Volts, Amps & Watts Calculator
Simple power calculator for electrical circuits. Calculate watts from volts and amps, or find missing values.
- P = V × I
- Quick and easy to use
Number System Converters
Convert between different number bases used in computing and digital electronics.
Binary, Octal, Hex & Decimal Converter
Convert numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16).
- Essential for programming and digital electronics
- Supports large numbers
- Step-by-step conversion explanation
Data Storage Converter (Bits & Bytes)
Convert between bits, bytes, kilobytes, megabytes, gigabytes, terabytes, and more.
- Binary (1024) and decimal (1000) standards
- All common units: KB, MB, GB, TB, PB
- Useful for storage and bandwidth calculations
Quick Reference
Common dBm to mW Conversions
| dBm | mW | W |
|---|---|---|
| -30 dBm | 0.001 mW | 1 µW |
| -20 dBm | 0.01 mW | 10 µW |
| -10 dBm | 0.1 mW | 100 µW |
| 0 dBm | 1 mW | 0.001 W |
| 10 dBm | 10 mW | 0.01 W |
| 20 dBm | 100 mW | 0.1 W |
| 30 dBm | 1,000 mW | 1 W |
| 40 dBm | 10,000 mW | 10 W |
Frequently Asked Questions
What is dBm?
dBm (decibel-milliwatt) is a logarithmic unit of power referenced to 1 milliwatt. It's commonly used in RF engineering, telecommunications, and fiber optics to express signal power levels. The formula is: P(dBm) = 10 × log₁₀(P(mW)/1mW).
Why use logarithmic units like dBm?
Logarithmic units make it easier to work with the huge range of power levels in RF systems (from nanowatts to megawatts). They also simplify calculations: gains and losses can be added/subtracted instead of multiplied/divided.
What's the difference between dBm and dBW?
dBm is referenced to 1 milliwatt, while dBW is referenced to 1 watt. The relationship is simple: dBW = dBm - 30. So 0 dBm = -30 dBW = 1 mW, and 30 dBm = 0 dBW = 1 W.
What is Ohm's Law?
Ohm's Law describes the relationship between voltage (V), current (I), and resistance (R): V = I × R. Combined with the power formula P = V × I, you can calculate any electrical quantity if you know two others.