CalculateMeasure

Math & Geometry

Direct Variation Calculator

Find the constant of direct variation and predict a corresponding y-value when y = kx.

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Calculator guide

How to use the Direct Variation Calculator

Find the constant of direct variation and predict a corresponding y-value when y = kx. Enter the requested values and select Calculate. The result and supporting values are produced locally in your browser.

Formula

k = y ÷ x; then y₂ = kx₂

Worked example

If y = 10 when x = 4, then k = 2.5 and y = 20 when x = 8.

What to keep in mind

  • Direct variation assumes y/x remains constant.

Methodology

This calculator uses deterministic arithmetic and performs the calculation locally in your browser. Verify assumptions, units, and source values for your specific use case.

Review standard: Level A · Standard formula. How calculator reviews work.

Frequently asked questions

What does this calculator calculate?

Find the constant of direct variation and predict a corresponding y-value when y = kx.

How is the result calculated?

k = y ÷ x; then y₂ = kx₂.

Can I use the result for an important decision?

Use the result as a calculation aid and verify the inputs, assumptions, and applicable professional or regulatory requirements before relying on it for an important decision.

Does CalculateMeasure store the values I enter?

The calculator performs its arithmetic in your browser. The calculator itself does not need to send your entered values to a server to produce the result.