Algebra Calculators
Direct Variation Calculator
Solve y = kx for x, y or k when two of the three are known.
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What is Direct Variation?
Direct variation means two quantities rise and fall together in a fixed ratio: doubling x doubles y. The ratio is the constant of variation k, and the relationship is y = kx.
How it works
Whichever of the three values is missing is solved from y = kx: k = y/x when x and y are known, y = kx when x and k are known, and x = y/k when y and k are known. The finished equation is shown so the rate is explicit.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.