Inverse Function Calculator

Find the inverse of a simple function f(x).

Fill in the fields below to calculate

Slope a (f(x)=ax+b)

Intercept b

Enter your values above and tap Calculate to see the result.

Your Results

Inverse Function

Original f(x)

Verification

f(f⁻¹(x)) = x ✓

Formula

f(x) = ax + b
f⁻¹(x) = (x - b) / a

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Pro Tips

Results update as you type — change any field to see the effect immediately.

Check that every value uses the same unit before comparing results.

Use the copy button to paste the inverse function figures into a note or spreadsheet.

Nothing is sent to a server, so you can use this with private figures.