Electrical & Radiation Converter
Convert electrical and radiation quantities across their unit multiples and non-SI equivalents. On the electrical side: voltage, current, resistance, conductance, charge, capacitance, inductance, magnetic flux and flux density, each with the full range of SI prefixes. On the radiation side: absorbed dose (gray, rad), equivalent dose (sievert, rem), radioactivity (becquerel, curie) and exposure (roentgen). Each quantity is independent and converts only within itself. Radiation conversions here are measurement conversions only and say nothing about safety.
How to use this tool
- Choose the quantity — electrical or radiation.
- Enter the value.
- Pick the unit you have and the unit you want; the menus update for the chosen quantity.
- Read the result and the full equivalents list.
- For radiation, note the measurement-only warning: these conversions are not a safety judgement.
The formula
Each electrical and radiation quantity is its own dimension with its own SI unit, related to others only through physical laws, not unit conversion. This tool converts within a chosen quantity across its unit multiples and non-SI equivalents.
within a quantity: result = value × (base per unit) ÷ (base per target)
e.g. 1 curie = 3.7×10¹⁰ becquerel (defined)- Gy
- Gray — absorbed dose, J/kg
- Sv
- Sievert — equivalent dose
- Bq
- Becquerel — one decay per second
Radiation unit conversions describe measurements only. They say nothing about safety, which depends on dose, radiation type, exposed tissue and time.
Worked examples
Battery charge
- Given
- 2 A·h
- Result
- 7200 C
An ampere-hour is 3600 coulombs, so a 2 A·h cell holds 7200 coulombs of charge.
Absorbed dose
- Given
- 1 gray
- Result
- 100 rad
The gray is the SI unit of absorbed dose; one gray equals 100 rad in the older system.
Radioactivity
- Given
- 1 curie
- Result
- 3.7×10¹⁰ becquerel
The curie is defined as exactly 37 billion becquerels — decays per second — a large amount of activity.
Frequently asked questions
Because voltage and current measure different things and are related by a physical law (Ohm’s law, V = I·R), not by a unit conversion. You need the resistance to link them. This tool converts within a single quantity — volts to millivolts, amps to milliamps — where the relationship is a fixed ratio.
The gray measures absorbed dose — energy deposited per kilogram — while the sievert measures equivalent dose, which weights that energy by how damaging the radiation type is to tissue. They share the same base units but are not interchangeable; the sievert reflects biological effect, the gray raw energy.
No. They convert between units of the same quantity only. Whether a dose or exposure is hazardous depends on its size, the type of radiation, which tissues are exposed and for how long — a judgement for qualified professionals with proper instruments. Treat these purely as unit conversions.
Both measure radioactivity — how many atomic nuclei decay per second. The becquerel is one decay per second, the SI unit. The curie is a much larger legacy unit, defined as exactly 3.7×10¹⁰ becquerels, roughly the activity of a gram of radium. Curies appear in older and medical sources.
Electrical quantities span an enormous range — from picofarads in circuits to megawatts on the grid — so engineers use the full set of prefixes to keep numbers manageable. The tool offers pico through mega on each electrical quantity so you can move between them without counting zeros.
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