How do I simplify a ratio using this calculator?

Enter the two numbers of the ratio (e.g., 12 and 18). The calculator will find the greatest common divisor (GCD) and divide both numbers by it, giving you the simplified ratio in its lowest terms, such as 2:3.

Can this calculator scale a ratio to a target value?

Yes. If you have a ratio like 2:5 and need to find the equivalent ratio when one part becomes a specific number (e.g., 10), the calculator will compute the missing value to maintain the proportion, giving you 10:25.

How do I convert a ratio to a percentage or fraction?

Enter the ratio (e.g., 3:4). The calculator will show the fraction (3/4) and the percentage (75%). It also provides the decimal equivalent (0.75) for quick reference.

数学

即时、私密且免费

比例计算器.

2026年8月4日

简化比例、求等比比例、解比例问题

设备端计算无需注册

输入数值

输入时结果会更新。

02 / 答案

计算模式

输入比例格式：4:8 或 “4 比 8” 或 4,8 或 4 8

格式：4:8 或 “4 比 8” 或 4,8 或 4 8

简化后的比例

1 : 2

除以 4

以百分比表示

33.3% : 66.7%

以分数表示

4/12 : 8/12

以小数表示

0.33 : 0.67

等比比例

1:2

×2

2:4

×3

3:6

×4

4:8

×5

5:10

×6

使用方法

比例: 对两个或多个数字的比较，表示一个值包含另一个值的倍数关系。

化简: 简化：通过除以最大公约数将比例化简为最小整数。

示例: 4:8 可化简为 1:2（两者都除以 4）

Cite this calculator

Canonical URL: https://mathify.one/zh/math/ratio

Updated 2026年8月4日

Cite as: Mathify. (2026). 比例计算器. https://mathify.one/zh/math/ratio

Use Cases

Simplify ratios for recipes or mixtures

When a recipe calls for a ratio of ingredients, use the calculator to reduce it to simplest form for easier scaling or to adjust quantities.

Example: Simplify 8:12 to 2:3 for a paint mix.

Scale ratios for resizing or budgeting

If you need to scale a ratio to a new total or a specific component value, the calculator helps find the missing number to keep proportions accurate.

Example: If a model car is 1:24 scale and the real car is 4.8 m, find the model length.

Frequently Asked Questions

How do I simplify a ratio using this calculator?: Enter the two numbers of the ratio (e.g., 12 and 18). The calculator will find the greatest common divisor (GCD) and divide both numbers by it, giving you the simplified ratio in its lowest terms, such as 2:3.
Can this calculator scale a ratio to a target value?: Yes. If you have a ratio like 2:5 and need to find the equivalent ratio when one part becomes a specific number (e.g., 10), the calculator will compute the missing value to maintain the proportion, giving you 10:25.
How do I convert a ratio to a percentage or fraction?: Enter the ratio (e.g., 3:4). The calculator will show the fraction (3/4) and the percentage (75%). It also provides the decimal equivalent (0.75) for quick reference.

Tips & Common Mistakes

Tips

Always enter the ratio numbers in the order they appear (e.g., first number:second number) to get the correct simplified form.
Use the scaling feature when you need to find an equivalent ratio with a known part, such as adjusting a recipe for more servings.
Check the percentage and decimal outputs to understand the ratio's value in different formats, useful for comparisons.
For ratios with more than two numbers, simplify each pair separately or use the calculator for each pair to ensure accuracy.

Common Mistakes to Avoid

Entering the numbers in the wrong order, which can lead to an incorrect simplified ratio or scaled value.
Forgetting to simplify the ratio fully, but the calculator does it automatically, so ensure you use the simplified result for further calculations.
Assuming the percentage is the first number divided by the second, but it's actually the first number divided by the sum of both numbers (e.g., 2:3 gives 40%, not 66.7%).

Last updated: August 13, 2026