Linear interpolation calculator
Estimate a value between two points assuming a straight-line relationship.
How to use this page
- Enter values or use the example in the form.
- Choose a mode or units where available.
- Read the result and check the calculation steps below.
What this page does not do: x₁ and x₂ must differ. No extrapolation outside the interval; the tool does not establish that your data are linear.
Further reading
Between (0,10) and (10,30), x=5 gives y=20. The formula distributes the y change in proportion to x.
Frequently asked questions
How is the result calculated?
Between (0,10) and (10,30), x=5 gives y=20. The formula distributes the y change in proportion to x.
What are the limitations?
x₁ and x₂ must differ. No extrapolation outside the interval; the tool does not establish that your data are linear.
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