Ratio Calculator
Simplify a ratio, find the missing term in A : B = C : ? and split a total in a given ratio.
Result
How to use
- 1
Choose what you want to do — simplify, find a missing value or split an amount.
- 2
Enter the numbers A and B (and C if asked).
- 3
The answer and the working update instantly.
Questions
How do I simplify a ratio?
Divide both terms by their highest common factor (HCF). For example 12 : 18 — the HCF is 6, so the ratio becomes 2 : 3.
How do I find the missing term in a proportion?
If A : B = C : D, then D = B × C ÷ A. For 2 : 3 = 10 : ?, the answer is 3 × 10 ÷ 2 = 15.
How do I divide money in a ratio?
Add the parts, then share the total in that proportion. ₹1,000 in the ratio 2 : 3 gives ₹1,000 × 2/5 = ₹400 and ₹1,000 × 3/5 = ₹600.
About this Ratio tool
Ratio Calculator — Simplify a ratio, find the missing term in A : B = C : ? and split a total in a given ratio. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Choose what you want to do — simplify, find a missing value or split an amount.
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Results are estimates to help you plan. They are not financial, tax or medical advice.