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Unit Conversion Tools

Convert length, weight, temperature, energy, power, frequency, voltage and electric charge — plus image and electrical calculator tools.

Conversion Results

Millimeter (mm)
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Centimeter (cm)
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Meter (m)
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Kilometer (km)
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Inch (in)
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Foot (ft)
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Yard (yd)
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Mile (mi)
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Nautical mile (nmi)
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Tip: Conversions use standard length factors; results are rounded to a reasonable precision.

Conversion Results

Milligram (mg)
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Gram (g)
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Kilogram (kg)
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Metric ton (t)
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Ounce (oz)
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Pound (lb)
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Stone (st)
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Tip: Conversions use standard mass factors; results are rounded to a reasonable precision.

Conversion Results

Celsius (°C)
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Fahrenheit (°F)
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Kelvin (K)
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Tip: Celsius, Fahrenheit and Kelvin use their own conversion formulas rather than a simple multiplier.

Conversion Results

Joule (J)
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Kilojoule (kJ)
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Calorie (cal)
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Kilocalorie (kcal)
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Watt-hour (Wh)
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Kilowatt-hour (kWh)
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BTU
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Tip: Conversions use standard energy factors; results are rounded to a reasonable precision.

Conversion Results

Watt (W)
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Kilowatt (kW)
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Megawatt (MW)
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Horsepower (hp)
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BTU/hour
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Tip: Conversions use standard power factors; results are rounded to a reasonable precision.

Conversion Results

Hertz (Hz)
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Kilohertz (kHz)
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Megahertz (MHz)
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Gigahertz (GHz)
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RPM
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Tip: Conversions use standard frequency factors; results are rounded to a reasonable precision.

Conversion Results

Millivolt (mV)
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Volt (V)
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Kilovolt (kV)
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Tip: Conversions use standard voltage factors; results are rounded to a reasonable precision.

Conversion Results

Microcoulomb (µC)
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Millicoulomb (mC)
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Coulomb (C)
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Milliamp-hour (mAh)
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Amp-hour (Ah)
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Tip: Conversions use standard electric-charge factors; results are rounded to a reasonable precision.

Image Size Converter (pixels ↔ physical size)

For "Physical size → Pixels", enter the physical size in the "Pixels" field (it will be reinterpreted using the unit selected). Image size doesn't reduce to a single "value + unit list" shape the way the other categories do, so it keeps its own two-way form.

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Ohm's Law & Power Calculator

Enter any two known values (Voltage, Current, Resistance) — leave the others blank and we'll calculate the rest, including Power. This is a multi-variable solver rather than a unit conversion, so it keeps its own form too.