单位换算Unit Converter

34 类单位，输入一个数，一眼看到全部结果 · 免费、无广告34 kinds of units. Type one number and see every result · Free, no ads

常用换算Popular conversions

大家最常换算的What people convert most

每一项都有自己的页面：公式、对照表和常见问题。Each has its own page with the formula, a conversion chart and answers to common questions.

iOS 版即将上架 App StoreComing soon to the App Store

输入一个数，
一眼看到全部结果 Type one number.
See every result.

单位随手换是一款免费、纯净、好用的单位换算器。不用一对一地来回换算——输入一个数，整列结果立即呈现；最常用的换算，直接在桌面小组件上完成。 Handy Units is a free, clean and easy-to-use unit converter. No more converting one pair at a time — enter a number and the whole column of results appears instantly. Your everyday conversions even work right on the Home Screen widget.

即将登陆Coming soon on theApp Store 稍后推出Coming later forAndroid

免费使用Free
界面纯净Clean
无需注册No account
离线可用Works offline

¥0$0全部功能免费，支持开发者完全自愿Every feature is free; supporting us is optional
纯净Clean界面干净，换算过程不弹窗、不打扰A tidy screen; nothing pops up mid-conversion
34 + 134 类单位，外加实时汇率34 unit categories, plus currency
13种界面语言，App 内一键切换app languages, switch in-app

亮点Highlights

为「快速得到答案」而设计Built to get you the answer, fast

打开即输入，零多余步骤。很多换算 App 要么难用，要么干扰太多——单位随手换就是为此而做的。Open it and type — nothing in between. Many converters are either clumsy or cluttered. Handy Units was made to fix that.

整列结果，一眼看全The whole column at once

输入一个数，这个分类下的所有单位同时出结果。常用单位置顶加星，其余排在下面，边输边算，没有「计算」按钮。Every unit in the category updates as you type. Pinned units sit on top with a star; there is no “convert” button.

点一下，换个方向Tap to flip direction

点任意结果行，它就变成新的输入单位，数值一起带过去。长按复制数值，或复制「数值 + 单位」。Tap any result to make it the input, value and all. Long-press to copy the number, or the number with its unit.

桌面上直接输入Type on your Home Screen

大号小组件内置数字键盘，不打开 App 就能换算；中号、小号和锁屏小组件让常用结果始终可见。The large widget has a built-in keypad, so you can convert without opening the app. Medium, small and Lock Screen widgets keep results in view.

Siri 与快捷指令Siri and Shortcuts

「换算单位」快捷指令可以用 Siri、Spotlight 和操作按钮调用，结果以卡片显示；iOS 18 还能放进控制中心。The “Convert Units” shortcut works from Siri, Spotlight and the Action button, answering in a card. On iOS 18 it’s in Control Center too.

汇率：离线也能看Currency, even offline

始终先显示本地缓存和「上次更新时间」，需要时一键联网刷新；缓存过时会明确提示。参考汇率，非银行交易价。Cached rates show first with their update time; refresh with one tap, and stale data is flagged clearly. Reference rates, not bank prices.

按你的习惯来Set up your way

首次启动选中国大陆、美国、英国，或「中 ⇄ 美」双向方案，常用单位自动置顶；也可以随时拖动排序、隐藏单位。Pick China, US, UK or a China ⇄ US preset on first launch and the right units are pinned. Reorder or hide any unit later.

这两个小组件也可以直接按：大号的键盘输入，中号跟着同步——和 App 里一样，它们共用同一个数值。 Both widgets are live: type on the large one’s keypad and the medium one follows — as in the app, they share one value.

桌面小组件Widgets

小组件是一等公民，
不是附属品Widgets come first,
not as an afterthought

iOS 小组件本来不能打字。我们在大号小组件里放了一整块数字键盘——每按一次，结果立即刷新。 iOS widgets can’t normally take text input, so the large widget carries its own keypad — every tap updates the result.

大号 · 桌面键盘Large · Keypad直接按键输入；顶部点分类切换，「单位」键循环切换输入单位，右侧上下翻页看更多结果。Tap in numbers; switch categories along the top, cycle the input unit with “Unit”, and page through results on the right.
中号 · 快速换算Medium · Quick convert一个数值对照多个结果，− / + 微调，⇄ 一键互换。One value against several results; − / + to nudge it, ⇄ to swap.
小号、锁屏与控制中心Small, Lock Screen and Control Center每个小号小组件可以单独选分类；锁屏小组件和控制中心按钮一步直达换算。Give each small widget its own category; Lock Screen widgets and the Control Center button jump straight in.

单位分类Categories

从日常到实验室From the kitchen to the lab

34 类单位加汇率，全部采用国际定义的精确换算系数。身高体重、油耗胎压、房屋面积、网速——中美两套单位制之间切换尤其顺手。34 categories plus currency, all using exact international definitions. Especially handy if you switch between metric and US customary every day.

常用Everyday13

温度长度油耗汇率重量面积体积速度压力时间功率能量数据

TemperatureLengthFuel EconomyCurrencyWeightAreaVolumeSpeedPressureTimePowerEnergyData

科学工程Science & Engineering10

密度角度力扭矩加速度流量频率黏度照度网速

DensityAngleForceTorqueAccelerationFlow RateFrequencyViscosityIlluminanceData Rate

电与磁Electricity & Magnetism9

电压电流电阻电容电感电荷磁场强度磁感应强度磁通量

VoltageCurrentResistanceCapacitanceInductanceElectric ChargeMagnetic FieldMagnetic Flux DensityMagnetic Flux

辐射Radiation3

放射性活度吸收剂量剂量当量

RadioactivityAbsorbed DoseDose Equivalent

拓展包Extension packs

换算之外，读懂历史上的单位Beyond conversion: units from history

拓展包与日常分类完全分开，按需启用，全部内置、离线可用。Packs live apart from everyday categories. Turn them on when you want them — all built in and offline.

这是 App 里的拓展包页面：切换朝代看同一个数差多少，点经典出处里的「代入这个例子」，数值和单位都会填好。 This is the app’s pack page: switch dynasties to compare the same amount, or tap “Try this example” under a quote to fill it in.

隐私Privacy

你的数字，只留在你的手机上Your numbers stay on your phone

App 里「设置 › 隐私政策」的页面，可以上下滑动阅读全文。 The app’s Settings › Privacy Policy page — scroll to read it all.

单位随手换，随手就换Get Handy Units

iOS 版即将上架，Android 版随后跟进。免费、纯净、好用。Coming soon for iPhone, with Android to follow. Free, clean and easy to use.