What does the Ratio Calculator work out?

Solve a proportion and simplify ratios. It is one of the Math tools on Mondo Knows.

How is the Ratio Calculator calculated?

You get an instant answer with the working shown underneath.

Do I need to sign up, and is my data stored?

No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

Mondo Knows Tools

Ratio Calculator

Solve a proportion and simplify ratios. Use the free ratio calculator below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.

D (leave blank to solve)

Mondo says

12

Proportion3 : 4 = 9 : 12

Ratio Calculator: common questions

What does the Ratio Calculator work out?: Solve a proportion and simplify ratios. It is one of the Math tools on Mondo Knows.
How is the Ratio Calculator calculated?: You get an instant answer with the working shown underneath.
Do I need to sign up, and is my data stored?: No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

Mondo also knows

Percentage CalculatorEvery common percentage question in one place.➗ Math Fraction CalculatorAdd, subtract, multiply and divide fractions.➗ Math Right Triangle CalculatorEvery side and angle of a right triangle.➗ Math Root CalculatorSquare roots, cube roots and any nth root.➗ Math

Facts that connect to the ratio calculator

Short, sourced facts that point back to this tool.

Starch ratio determines whether cooked rice is fluffy or stickyHigh amylose content yields firm separate grains while amylopectin causes stickiness The James Webb Space Telescope uses gold-coated beryllium mirrorsGold plating reflects infrared light from the earliest stars in the universe Jupiter Great Red Spot is a anticyclonic storm shrinking over timeThe giant storm has raged for centuries but is now smaller than ever recorded Saturn moon Mimas resembles the fictional Death StarThe giant Herschel crater covers one third of the lunar diameter

Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.