腕上计算
先乘除、后加减；可用括号。百分号始终把前面的数除以100：200+10%=200.1。若要增加10%，请用“百分比增减”。
“打几折”输入8表示保留80%；“减百分比”输入20表示省去20%。输入原价、选择模式和比例后计算，结果与省下金额分开显示。长度、重量和温度使用静态换算系数，不提供实时汇率。
撤销可恢复上一次编辑，包括清空；退格删去一个字符。“最近”最多保留20条成功结果，点数值可完整复用，删除操作会保存到本地。
数值绝对值必须小于10¹²，输入最多6位小数；表达式及每个快捷输入栏最多64字符。每步计算按6位小数四舍五入，恰好一半时远离零。除零、超范围和无效输入会显示错误，不会作为计算结果保存。
历史损坏时恢复为空并提示。若出现“历史保存失败”，当前改动尚未写入磁盘；不要把屏幕上的结果或删除状态当作已保存。存储恢复后的成功写入会清除提示。
小屏可滚动；子页可返回上一级。应用免费、离线，无需账号。结果不构成金融建议。
遇到问题，请在产品支持页说明平台、系统版本、操作步骤及预期结果。不要附密码、验证码或私人计算记录。
WristCalc
Multiplication and division precede addition and subtraction. Parentheses are supported. Percent always divides the preceding operand by 100: 200+10%=200.1. Use Percentage for a 10% increase.
Retained tenths 8 keeps 80%; percent off 20 saves 20%. Enter the original value, select the mode and rate, then calculate. Result and savings are separate. Length, weight and temperature use fixed factors; there are no live exchange rates.
Undo restores the previous edit, including Clear. Backspace removes one character. Recent keeps up to 20 successful results. Tap a value to reuse it exactly, or delete it from local history.
Numbers must have absolute value below 10¹² and at most 6 decimal places. Expressions and each shortcut field accept at most 64 characters. Each step rounds to 6 decimal places, with ties away from zero. Division by zero, overflow and invalid input show errors and are not saved as calculation results.
Damaged history recovers empty with a notice. If “Could not save history” appears, the current change has not reached disk. A visible result or removed row does not mean it was saved. A successful write after storage recovers clears the notice.
Scroll on small screens; child pages return one level. The app is free, offline and requires no account. Results are not financial advice.
Report problems on the product support page, including platform, OS version, steps and expected result. Do not attach passwords, verification codes or private calculations.