比與比例計算器

使用方法

1. 1
   填寫各項

   輸入數字或選擇所需選項。

2. 2
   檢視結果

   更改任何值時，答案會立即更新。

3. 3
   使用結果

   複製結果或記下來。不會向任何地方傳送任何內容。

About this tool

Choose Simplify to reduce a ratio such as 12 : 18 to 2 : 3 and see each part as a percentage. Choose Solve to find the missing number x in a : b = c : x, useful for recipes, maps, scaling and exchange problems.

When to use it

Simplify a ratio or solve a proportion for the missing value.

Tips

Cross multiply to solve a proportion.

Privacy

Everything runs in your browser, so your data is not uploaded or stored.

Worked example

A recipe uses 2 cups of rice for 3 cups of water. For 5 cups of rice you need x water where 2 : 3 = 5 : x, so x is 7.5 cups. Cross multiply and divide to solve.

計算示例

With the boxes at their starting values (What do you want to do?: Simplify a ratio; a: 12; b: 18; c: 20), the tool shows: As a decimal (a ÷ b): 0.6667; Share of the total: 40.00% : 60.00%; Simplest ratio: 2 : 3. Change any box to see your own numbers. The result updates as you type, and nothing leaves your browser.

獲得最佳結果的提示

在相信結果之前先檢查每一個輸入項，因為一個錯誤的數字就會改變整個答案。請使用工資單、賬單、證書或合同上的準確數字，並記下計算日期。稅率、門檻和規則會不時變化，因此對於稅費和法律事務，請將結果視為估算，並與本頁註明的官方來源核對。您可以嘗試任意多個方案；不會儲存或傳送任何內容，重新整理頁面會清空輸入。