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Bathroom Mirror Size Calculator

Vanity Width (inches):

Vanity Height (inches):

Space Above Counter (inches):

Space Below Light Fixture (inches):

Side Clearance (inches):

Understanding Bathroom Mirror Sizing

Choosing the right size for your bathroom mirror is crucial for both functionality and aesthetic appeal. A well-proportioned mirror can enhance the sense of space, improve lighting, and serve as a focal point in your bathroom design. This calculator helps you determine optimal mirror dimensions based on common design guidelines and the physical constraints of your vanity and surrounding fixtures.

Key Considerations for Mirror Sizing:

Vanity Width: The mirror's width is typically related to the vanity's width. A common recommendation is for the mirror to be about two-thirds (2/3) the width of the vanity.
Vertical Space: The mirror should have adequate space above the countertop and below any light fixtures or cabinetry. This provides a balanced look and prevents the mirror from appearing too cramped.
Side Clearance: Leaving some space between the mirror and the side walls or other vertical elements (like medicine cabinets or shower surrounds) creates visual breathing room and a more harmonious design.
Ergonomics: The mirror should be positioned at a height that is comfortable for most users, generally with the bottom edge of the mirror around 27-35 inches from the floor, allowing for comfortable viewing whether standing or sitting.

How the Calculator Works:

This calculator uses a common set of design principles to suggest a mirror size. It calculates the following:

Recommended Mirror Width: It defaults to Vanity Width * (2/3). You can adjust this based on your preference, but it serves as a good starting point.
Recommended Mirror Height: The calculator determines the available vertical space by subtracting the Space Above Counter and Space Below Light Fixture from the total wall height (assuming a standard 8-foot or 96-inch ceiling, which can be adjusted if needed, though this calculator simplifies by using the provided gaps). The height is then derived from this available space, aiming for a balanced aesthetic. The formula essentially finds the maximum height that fits within the defined vertical gaps: Available Vertical Space = Total Wall Height - Space Above Counter - Space Below Light Fixture. The calculator then aims to utilize a significant portion of this available space. For simplicity, it uses the sum of the gaps to determine the maximum height: Maximum Mirror Height = Wall Height - Space Above Counter - Space Below Light Fixture. This calculator focuses on the *gaps* rather than total wall height for simplicity, implying the mirror fits between these points. A more complex calculator might consider the total wall height. The height is calculated as Total Height Available - Space Above Counter - Space Below Light Fixture.
Optimal Dimensions: The tool suggests a mirror width and height that respects the clearances you provide.

Formula Breakdown (Simplified):

The core logic calculates potential mirror dimensions:

Mirror Width = Vanity Width * 0.667 (approximately 2/3)
Max Possible Mirror Height = Available Wall Height - Space Above Counter - Space Below Light Fixture. This calculator uses the sum of the gaps and assumes the mirror fits within them. A more precise calculation would factor in the actual wall height. For this tool, we'll assume the height is based on the available space Wall Height - Top Clearance - Bottom Clearance. Let's assume a standard ceiling height for reference if needed, but the primary inputs dictate the usable space. The calculator directly uses the space between the counter and light fixture.

Example Calculation:

Let's say you have:

Vanity Width: 48 inches
Vanity Height: 34 inches (This input isn't directly used in the size calculation but helps visualize the space)
Space Above Counter: 8 inches
Space Below Light Fixture: 10 inches
Side Clearance: 4 inches (per side)

Calculation:

Recommended Mirror Width: 48 inches * (2/3) = 32 inches. The calculator might suggest a width around this value, possibly adjusted by side clearance. If side clearance is 4 inches per side, the maximum mirror width would be Vanity Width - (2 * Side Clearance) = 48 - (2 * 4) = 40 inches. The recommendation of 32 inches fits comfortably within this.
Recommended Mirror Height: Assuming a standard 96-inch ceiling: 96 inches (Ceiling) - 8 inches (Above Counter) - 10 inches (Below Light) = 78 inches of available vertical space for the mirror. The calculator aims to place the mirror within this range, suggesting dimensions that are visually balanced. If we consider the space solely between the counter and light fixture as the primary constraint, and assuming the bottom of the mirror aligns with the top of the vanity or slightly above, the height is derived from the space between these points. For simplicity, the calculator uses the gap between the counter and light fixture. The calculation is: Height = Wall Height - MirrorToCounter - MirrorToLight. Let's assume a typical wall height of 96 inches. Then 96 - 8 - 10 = 78 inches is the maximum height. The calculator will suggest a height that balances within this.

Therefore, a mirror around 32 inches wide and 30 inches high could be a suitable recommendation, allowing for the specified clearances and maintaining aesthetic balance.

When to Use This Calculator:

Planning a bathroom renovation.
Purchasing a new vanity and mirror.
Replacing an existing mirror.
Ensuring a visually balanced and functional bathroom space.

function calculateMirrorSize() { var vanityWidth = parseFloat(document.getElementById("vanityWidth").value); var vanityHeight = parseFloat(document.getElementById("vanityHeight").value); // Not directly used in sizing, but good context var mirrorToCounter = parseFloat(document.getElementById("mirrorToCounter").value); var mirrorToLight = parseFloat(document.getElementById("mirrorToLight").value); var sideClearance = parseFloat(document.getElementById("sideClearance").value); var resultDiv = document.getElementById("result"); resultDiv.innerHTML = ""; // Clear previous results // Input validation if (isNaN(vanityWidth) || vanityWidth <= 0 || isNaN(mirrorToCounter) || mirrorToCounter < 0 || isNaN(mirrorToLight) || mirrorToLight < 0 || isNaN(sideClearance) || sideClearance < 0) { resultDiv.innerHTML = "Please enter valid positive numbers for all fields."; return; } // — Calculations based on common guidelines — // 1. Recommended Mirror Width // Guideline: Mirror width is often 2/3 of the vanity width. // Also, ensure it doesn't exceed vanity width minus side clearances. var recommendedWidth = vanityWidth * (2 / 3); var maxPossibleWidth = vanityWidth – (2 * sideClearance); // The final suggested width should be the smaller of the recommended ratio and the max possible width, // but not less than a reasonable minimum (e.g., 12 inches). var finalMirrorWidth = Math.max(12, Math.min(recommendedWidth, maxPossibleWidth)); // Ensure width is not negative if side clearance is too large finalMirrorWidth = Math.max(12, finalMirrorWidth); // 2. Recommended Mirror Height // This calculation assumes a standard ceiling height (e.g., 96 inches or 8 feet). // The available vertical space is the total wall height minus the space above the counter and below the light. var standardCeilingHeight = 96; // inches var availableVerticalSpace = standardCeilingHeight – mirrorToCounter – mirrorToLight; // Ensure available space is not negative if (availableVerticalSpace availableVerticalSpace) { finalMirrorHeight = availableVerticalSpace; } // Ensure minimum height finalMirrorHeight = Math.max(20, finalMirrorHeight); // Display Results var resultHtml = "

Suggested Mirror Dimensions:

"; resultHtml += "Width: " + finalMirrorWidth.toFixed(1) + " inches"; resultHtml += "Height: " + finalMirrorHeight.toFixed(1) + " inches"; resultHtml += "(Based on guidelines and your inputs. Adjustments may be needed based on specific vanity style and personal preference.)"; resultDiv.innerHTML = resultHtml; }