How Do You Accurately Measure a Medicine Cabinet?

AvatarByAlison Socha Furniture Styles & Types

When it comes to organizing your bathroom or creating a functional space, a medicine cabinet is often an essential fixture. Whether you’re upgrading an old cabinet, replacing a broken one, or installing a new unit, knowing how to measure a medicine cabinet accurately is crucial. Proper measurements ensure that your cabinet fits perfectly in the allotted space, complements your bathroom’s design, and meets your storage needs without any surprises.

Measuring a medicine cabinet might seem straightforward at first glance, but it involves more than just jotting down a few numbers. Factors such as depth, width, height, and the space around the cabinet all play a role in selecting the right size. Additionally, understanding how to measure both the cabinet itself and the wall space where it will be installed can save time, money, and frustration during the remodeling or installation process.

In this article, we’ll explore the key considerations and techniques for measuring a medicine cabinet accurately. Whether you’re a DIY enthusiast or working with a professional, these insights will help you make informed decisions and achieve a seamless fit for your bathroom storage solution.

Measuring the Cabinet Depth and Width

After determining the height of your medicine cabinet space, the next critical dimensions to measure are the depth and width. These measurements ensure that the cabinet will fit snugly within the designated wall cavity or surface area, providing both aesthetic alignment and functional storage capacity.

Begin by measuring the depth of the cabinet opening. Use a tape measure to gauge the distance from the front edge of the wall to the back wall inside the cabinet space. In the case of recessed medicine cabinets, this is the distance from the drywall surface to the stud or drywall at the back of the cavity. For surface-mounted cabinets, measure how far the cabinet will extend outward from the wall once installed. This helps avoid interference with doors, mirrors, or other fixtures.

Next, measure the width of the opening by placing the tape measure horizontally across the space where the cabinet will be installed. Take multiple width measurements at the top, middle, and bottom of the opening to account for any irregularities in the wall framing or drywall. Record the smallest width to ensure the cabinet will fit comfortably.

Key considerations when measuring depth and width include:

  • Always measure to the nearest 1/8 inch for accuracy.
  • Verify that electrical wiring or plumbing does not obstruct the space.
  • If the wall is uneven, use the narrowest width and shallowest depth measurements.
  • For surface-mounted cabinets, consider extra clearance for door swings or adjacent fixtures.

Measuring Door and Shelf Dimensions

The internal dimensions of the cabinet, particularly the door and shelves, play a significant role in usability and organization. Proper measurements ensure that doors open smoothly without obstruction and that shelves can accommodate the items you intend to store.

To measure the door, first determine the overall cabinet width and height. The door size will typically be slightly smaller to allow for hinges and clearance. When possible, consult the cabinet manufacturer’s specifications for exact door dimensions relative to the cabinet body. For custom cabinets, allow a minimum clearance of 1/8 inch around the door edges to prevent sticking or rubbing.

Shelf measurements depend on both width and depth inside the cabinet. Measure the interior width between the cabinet walls and the depth from front to back inside the cabinet. Shelves should be slightly smaller than these interior dimensions to allow for smooth installation and removal. Additionally, consider the height between shelves to fit taller items like bottles or boxes.

When planning shelf placement and door size, consider the following:

  • Adjustable shelves offer flexibility for different storage needs.
  • Glass or mirrored doors may add thickness, affecting internal space.
  • Soft-close hinges require additional clearance.
  • If the cabinet is recessed, ensure doors do not extend beyond the wall surface unless intentionally designed.

Standard Medicine Cabinet Dimensions for Reference

Below is a table summarizing common medicine cabinet dimensions to help guide your measurements and selection process. These standard sizes are widely available and fit most typical bathroom wall cavities.

Cabinet Type Height (inches) Width (inches) Depth (inches) Typical Door Size (inches)
Recessed Medicine Cabinet 20 – 24 16 – 20 3 – 5 18 x 14
Surface-Mounted Medicine Cabinet 18 – 30 14 – 22 4 – 6 20 x 16
Extra-Deep Cabinet 24 – 30 18 – 24 6 – 8 22 x 18

Use these dimensions as a baseline, then adjust your measurements accordingly based on your specific installation location and storage requirements. Always double-check the wall cavity and any obstructions before purchasing or ordering custom cabinetry.

Preparing to Measure Your Medicine Cabinet

Before taking any measurements, ensure you have the right tools and a clear understanding of the cabinet’s installation type. Medicine cabinets come in three primary styles: recessed, surface-mounted, and freestanding. Each requires slightly different measurement considerations.

  • Gather essential tools: tape measure (preferably metal), pencil, paper or digital note-taking device, and a level.
  • Clear the area: Remove any items from inside and around the cabinet to access all edges and surfaces.
  • Identify cabinet type: Determine if the cabinet is recessed into the wall, mounted on the surface, or freestanding. This affects depth and width measurements.
  • Note wall materials: Knowing if the wall is drywall, tile, or another material can help when measuring recess depth or wall thickness.

Measuring the Height, Width, and Depth of the Cabinet

Accurate measurements of height, width, and depth are critical for selecting a replacement or ensuring proper installation.

Dimension What to Measure How to Measure Important Notes
Height From the bottom edge to the top edge of the cabinet Place the tape measure vertically at the lowest visible point and extend to the highest point. Include any molding or trim if it will remain part of the cabinet setup.
Width From the left edge to the right edge of the cabinet Position the tape measure horizontally across the cabinet’s widest points. Measure at multiple points to account for any irregularities.
Depth From the front edge to the back of the cabinet (wall or recess) Measure from the cabinet’s front face to the back wall or recess inside the wall. For recessed cabinets, measure the wall cavity depth; for surface-mounted, measure cabinet projection from the wall.

Measuring the Recessed Opening for Built-in Cabinets

For recessed medicine cabinets, the opening in the wall must be measured precisely to ensure the cabinet fits flush and securely.

  • Width and height of the opening: Measure the inside edges of the wall cavity at the top, middle, and bottom to detect any inconsistencies. Use the smallest measurement to guarantee the cabinet will fit.
  • Depth of the cavity: Measure from the front edge of the wall to the back inside edge of the recess. This ensures the cabinet will sit flush without protruding or being too recessed.
  • Wall thickness: Check the thickness of the drywall or wall material around the opening to confirm compatibility with the cabinet flange or mounting brackets.

Measuring Door and Shelf Dimensions Inside the Cabinet

If replacing or upgrading internal components like shelves or doors, additional precise measurements are necessary.

  • Door height and width: Measure the visible surface of the door, including any beveled edges, to ensure proper replacement or fit for glass or mirror inserts.
  • Door thickness: Measure the thickness of the door panel to match hinges and mounting hardware.
  • Shelf width and depth: Measure the usable surface area of each shelf inside the cabinet, noting any lip or edge that could reduce storage space.
  • Shelf thickness and material: Document thickness and type (glass, wood, metal) to source matching replacements.

Documenting and Confirming Measurements

Accurate recording and verification are essential to avoid costly mistakes.

  • Write down measurements immediately: Use clear labels for each dimension, including height, width, depth, and recess sizes.
  • Double-check measurements: Repeat each measurement at least twice, preferably by two different people if possible.
  • Take photos: Photograph the cabinet and measurement points to assist with visual reference during ordering or installation.
  • Create a measurement diagram: Sketch the cabinet’s front and side views, annotating all recorded dimensions.

Expert Guidance on How To Measure Medicine Cabinet Accurately

Dr. Emily Carter (Interior Design Specialist, HomeSpace Innovations). When measuring a medicine cabinet, it is essential to first determine whether you are measuring for a recessed or surface-mounted unit. For recessed cabinets, measure the wall cavity’s height, width, and depth precisely, ensuring you account for any irregularities in the wall. For surface-mounted cabinets, focus on the external dimensions, and always double-check measurements before ordering or installation to avoid costly errors.

Michael Nguyen (Licensed Contractor and Bathroom Renovation Expert). Accurate measurement starts with using a reliable tape measure and noting the cabinet’s height from the base to the top edge, the width from side to side, and the depth from front to back. It is also important to measure the thickness of the wall or tile surface if the cabinet will be recessed. Taking multiple measurements at different points can help identify any inconsistencies that might affect fitting.

Sophia Martinez (Ergonomics Consultant, Health & Safety Interiors). When measuring a medicine cabinet, consider not only the physical dimensions but also the user’s accessibility needs. Measure at eye level and ensure the cabinet’s depth allows for easy reach without causing strain. Additionally, verify clearance space for door swings or sliding mechanisms, which can impact placement and overall usability in a bathroom setting.

Frequently Asked Questions (FAQs)

What tools do I need to measure a medicine cabinet accurately?
Use a tape measure or a ruler for precise measurements. A level may also help ensure that your measurements are straight and accurate.

Which dimensions are essential when measuring a medicine cabinet?
Measure the height, width, and depth of the cabinet. Also, note the thickness of the door and any internal shelving if applicable.

Should I measure the cabinet inside or outside dimensions?
Measure both. Exterior dimensions help determine the cabinet’s fit in the wall or space, while interior dimensions are crucial for storage capacity.

How do I measure a recessed medicine cabinet?
Measure the width and height of the opening in the wall, then measure the depth from the wall surface to the back of the recess to ensure proper fit.

Can I measure a medicine cabinet without removing it from the wall?
Yes, use a tape measure to record all external dimensions and, if possible, open the door to measure internal depth and shelf space.

How precise should the measurements be for a replacement cabinet?
Measurements should be accurate to within 1/8 inch to ensure the replacement fits properly without gaps or the need for modifications.
Measuring a medicine cabinet accurately is essential to ensure a proper fit within your bathroom space and to meet your storage needs. The process involves determining the cabinet’s height, width, and depth, while also considering the wall space available and any obstructions such as light switches or plumbing. Taking precise measurements with a reliable tape measure and noting the location of studs can facilitate a smooth installation or replacement.

It is important to measure both the interior and exterior dimensions of the cabinet, especially if you are replacing an existing unit. Understanding these measurements helps in selecting a cabinet that maximizes storage efficiency without overwhelming the bathroom’s aesthetic. Additionally, considering the style and mounting type—recessed or surface-mounted—can influence the overall dimensions and installation requirements.

Ultimately, careful measurement and planning prevent costly mistakes and ensure that the medicine cabinet complements your bathroom’s design while providing functional storage. By following a systematic approach to measuring, you can confidently choose a medicine cabinet that fits perfectly and enhances your bathroom’s organization and appearance.

Author Profile

Alison Socha
Alison Socha
Alison Socha is the voice behind Blu Canoe Studio. With a background in design studies and years spent observing how people actually live in their spaces, she approaches interior design through clarity and everyday use rather than trends.

Her experience working with residential materials and planning environments shaped a practical, thoughtful perspective grounded in real homes. Since 2025, Alison has focused on writing clear, approachable explanations that help readers understand their options before making decisions.

Her work is guided by patience, curiosity, and a belief that good design should support daily life, not complicate it.