Which unit categories are supported?

Energy, Pressure, Force, Power, and Frequency — the most common categories in physics and engineering.

How accurate are the conversions?

Conversions use standard SI-defined factors and are accurate to at least 10 significant figures.

What is an electron-volt?

An electron-volt (eV) is the kinetic energy gained by an electron accelerating through 1 volt, equal to approximately 1.602×10⁻¹⁹ joules.

What is the difference between bar and atmosphere?

1 atm = 101,325 Pa; 1 bar = 100,000 Pa. They are close but not equal — bar is a rounder metric unit.

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Scientific Unit Converter

Convert between scientific units for energy, pressure, force, power, and frequency.

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このツールについて

A comprehensive scientific unit converter covering five physical quantity categories: Energy (joules, calories, kilowatt-hours, electron-volts, BTU), Pressure (pascals, atmospheres, bar, psi, mmHg), Force (newtons, kilogram-force, pound-force, dyne), Power (watts, kilowatts, horsepower, BTU/hr), and Frequency (Hz, kHz, MHz, GHz, rpm). Enter a value, choose the source unit and category, and instantly see the equivalent in every other unit. A formula reference panel explains the conversion factors used.

使い方

1 Select a quantity category (e.g., Energy).
2 Enter the numeric value you want to convert.
3 Choose the source unit from the dropdown.
4 All equivalent values appear instantly in the results panel.
5 Expand the Formula Reference to see the conversion factors.

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