Free · Everyday planning calculators

Bathroom Mirror Clearance Planner

Estimate circular, rectangular and paired mirror dimensions from vanity and ceiling measurements.

  • Formula & worked example
  • Private in your browser
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

A 120 cm vanity gives a 109.84 cm rectangular mirror width under the four-inch allowance.

Width = vanity width − 4 in; available height = ceiling − vanity − 12 in

Worked example

Enter these known values and leave the other values blank.

Type of bathroom mirror
Rectangular
Height of vanity
100 cm
Width of vanity
120 cm
Height of ceiling
250 cm
Height of mirror
119.52 cm
Width of Mirror
109.84 cm

Assumptions and limitations

  • The fixed clearances are design heuristics: four inches of total width clearance and twelve inches vertically. Check fixture obstructions and installation requirements before ordering.

Common questions

What does this estimate assume?

The fixed clearances are design heuristics: four inches of total width clearance and twelve inches vertically. Check fixture obstructions and installation requirements before ordering.

Can I find a missing input?

Clear the unknown field and enter compatible known values. The controls retain supported inverse calculations, while rounded counts and one-way outputs stay directional.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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