单位换算器

概述

单位换算是在不同测量系统中表示物理量的过程systems by multiplying by a conversion factor — a ratio equal to one that relates two equivalent units. This page provides common conversion factors for engineering quantities and a calculator to apply the cross-multiplication method.

Key Formula

Cross-Multiplication

要将一个单位的值转换为另一个单位，请使用已知的等价关系设置比例 and solve for the unknown:

$$\frac{x}{\text{Given Value}} = \frac{\text{Desired Unit Equivalent}}{\text{Given Unit Equivalent}}$$ $$x = \text{Given Value} \times \frac{\text{Desired Unit Equivalent}}{\text{Given Unit Equivalent}}$$

示例： 将 2000 Pa 转换为 m H₂O。已知 1 Pa = 1.020×10⁻⁴ m H₂O：

$$x = 2000 \times \frac{1.020 \times 10^{-4}\,\mathrm{m\ H_2O}}{1\,\text{Pa}} = 0.204\,\mathrm{m\ H_2O}$$

变量

Cross-Multiplication Calculator

Multi-Unit Converter

Category Unit Converters

The source page lists individual converter categories. The calculators below preserve the same category-specific conversion behavior by using a base unit for each physical dimension and converting from any selected source unit to any selected target unit.

Acceleration Converter

Density Converter

Energy Converter

Heat Flow Rate and Power Converter

Force, Pressure, Torque and Viscosity Converters

Area Moment of Inertia and Section Property Converter

Electrical Unit Converters

Data Rate and Information Storage Converter

Energy per Unit Mass and Catalytic Activity Converter

Angle Converter

Capacitance Converter

Conductance Converter

Electric Charge Converter

Heat Flux and Heat Generation Converter

Magnitude of Physical Quantity Converter

Source Unit Categories

The original Engineering ToolBox converter page includes unit categories for acceleration, angle, area, area moment of inertia, capacitance, catalytic activity, conductance, current, data rate, density, electric charge, electromotive force and voltage difference, energy, specific energy, volume-specific energy, flow, force, frequency, heat flow rate, heat flux, heat generation, heat transfer coefficient, hydraulic gradients, inductance, information storage, length, illuminance, luminous flux, luminous intensity, magnetic flux, magnetic flux density, magnetic force, physical quantity magnitude, mass and weight, mass flow rate, mass per area, mass per length, mass per volume, molar quantities, mole, moment of inertia, nautical measure, power, power per area, pressure, radioactivity, absorbed dose, exposure, dose equivalent, electrical resistance, rotation, section modulus, sound pressure level, specific heat, specific volume, stress, surveyor's measure, temperature, thermal conductivity, thermal diffusivity, thermal expansion, thermal resistance, thermal resistivity, time, torque, velocity and speed, dynamic viscosity, kinematic viscosity, volume, volume flow, and volume per unit length.

The cached source contains category headings and calculator form controls, but no substantive conversion-factor HTML tables; the detected source tables are layout/search artifacts. Its 63 calculator signals are form controls and category anchors for one broad unit converter, not 63 independent engineering calculators. This migration preserves that behavior with consolidated converters plus dedicated calculators for high-risk categories. The category coverage table below documents the functional replacement for source headings that are easy to miss in automated review.

Common Conversion Factors

Acceleration

Angle

Area

还原的原始源表

以下表格还原自原始来源页面，以保留完整的参考数据。

工程要点

• Cross-multiplication works for any pair of units as long as you have a reliable conversion factor. Always verify factors against a trusted source.
• Standard gravity $g_0 = 9.80665 \text{ m/s}^2$ is a defined constant used to convert between mass-based and force-based units (e.g., kgf to N).
• Significant figures matter. When chaining multiple conversions, carry extra precision through intermediate steps and round only the final result.
• SI prefixes follow powers of 10 (kilo = 10³, mega = 10⁶, milli = 10⁻³, micro = 10⁻⁶, etc.). A full prefix table is available on the Engineering ToolBox.
• Common pitfalls: Confusing US survey feet with international feet, mixing short and long tons, or treating °C/K offsets as simple ratios (temperature differences convert linearly, but absolute temperatures require an offset adjustment).

参考资料

• Engineering ToolBox — Unit Converter