Subtract the furniture depth projecting into a corridor from its clear width before placement. The difference is the remaining width at that measured location—not a finding that the entire passage is usable or meets applicable requirements.
The Office Corridor Clearance Calculator lists two inputs in inches: “Clear corridor width before placement” and “Furniture depth occupying corridor.” Its result section includes remaining corridor width and the two dimensions used. Use this comparison to evaluate a proposed cabinet, console, or other furniture item before committing to its location.
Measure the Width Where the Furniture Will Stand
Measure across the corridor, perpendicular to the direction of travel, at the proposed furniture location. Use the actual clear distance between the existing boundaries—not a nominal corridor dimension from a room label.
Keep both inputs on the same measurement line:
Existing corridor boundary → furniture projection → remaining passage → opposite boundary.
If a column or other fixed obstruction narrows the corridor beside the proposed furniture, measure to that obstruction rather than to the wall behind it. Take additional measurements along the furniture’s proposed length when the boundaries are uneven or the passage changes width. A measurement from a wider section does not describe a narrower section nearby.
The calculator describes the starting width as a project measurement, not a code minimum, and asks for the greatest front-to-back furniture depth projecting into the corridor.
Measure the projection, not automatically the full furniture depth
Use the portion of the installed furniture footprint that occupies the measured corridor width.
For furniture placed directly against the corridor boundary, this may equal its full depth. If the furniture sits partly inside a recess, only the portion extending beyond that boundary occupies the corridor. Conversely, if it must stand away from the wall, include that offset in the total projection.
Check the exact product configuration. A countertop overhang, base, handle, or other fixed component may extend farther than the main cabinet body. Use the outermost relevant edge rather than assuming the listed body depth describes the complete installed projection.
Do not subtract an existing obstruction twice. If the starting clear width already excludes an existing cabinet, subtract only the additional projection introduced by the proposed change.
Calculate the Remaining Corridor Width
For a single furniture projection along one measurement line, use:
[
R = W – D
]
where:
- (R) = remaining corridor width, in inches.
- (W) = clear corridor width before placement, in inches.
- (D) = furniture projection into that width, in inches.
The model assumes that (W) and (D) describe the same cross-section and use matching reference boundaries. It calculates a linear difference, not floor area or a complete circulation layout.
The calculator’s displayed inputs use inches and list a minimum input value of zero. Enter nonnegative dimensions; a zero furniture projection represents no reduction in width in this model.
Convert other measurements before entering them:
- Feet to inches: multiply by 12.
- Feet and inches: multiply the feet by 12, then add the remaining inches.
- Millimeters to inches: divide by 25.4.
No whole-number rounding is required. Retain the precision supported by the measurements, and do not round the remaining width upward to make a constrained arrangement appear acceptable. For fractional dimensions, convert consistently—for example, 18½ inches becomes 18.5 inches.
Compare Two Cabinet Options
Assume an illustrative office corridor measures 66 inches clear at the proposed cabinet location. Both cabinet options would stand against the same boundary, with no rear offset, and their stated depths include all fixed projections.
| Measurement or result | Cabinet A | Cabinet B |
|---|---|---|
| Clear width before placement | 66 in | 66 in |
| Furniture projection | 18 in | 24 in |
| Remaining width | 48 in | 42 in |
The calculations are:
[
R_A = 66 – 18 = 48\text{ inches}
]
[
R_B = 66 – 24 = 42\text{ inches}
]
Cabinet A leaves 6 inches more width at this location. That difference can inform which product deserves further layout review, but neither result establishes an acceptable minimum passage width.
These are hypothetical dimensions, not recommended clearances. Before selecting either cabinet, check the remaining width against the project’s actual circulation needs and applicable requirements.
Interpret the Result Without Overstating It
The remaining width describes only the space left along the measured line.
| Calculated result | Meaning within the subtraction model | Planning response |
|---|---|---|
| (R > 0) | Some width remains beside the furniture. | Compare it with the project’s required clearance and examine the rest of the route. |
| (R = 0) | The furniture occupies the entire measured width. | Revise the proposed placement; this model leaves no passage at that cross-section. |
| (R < 0) | The furniture projection exceeds the available width. | The proposal does not fit within the measured cross-section. Recheck the dimensions or choose another position or product. |
These interpretations follow from the subtraction formula; they do not describe how the calculator displays or validates every boundary case.
If the project has an established required clear width, (C), compare it with the calculated result:
[
M = R – C
]
Here, (M) is the difference between the modeled remaining width and the project requirement, with all dimensions in inches. A negative value identifies a shortfall at that location. A nonnegative value means only that the numerical width comparison is satisfied; it does not resolve doors, turns, operating furniture, or other route conditions.
The project requirement must come from the applicable design criteria and requirements for that location. Do not treat an example dimension or a user-selected target as a universal minimum.
Check Conditions the Two Inputs Do Not Capture
A closed cabinet’s footprint is not its operating space. Review drawers, hinged doors, pull-out components, and the position of a person using the furniture separately. Do not assume these activities can occupy the remaining passage without affecting circulation.
Likewise, one width measurement cannot establish continuous clearance along a route. Before approving the placement:
- Check narrower sections before and after the furniture, including columns, wall offsets, and nearby furniture.
- Review room-door swings and cabinet openings in their operating positions.
- Check corners, intersections, approaches, and turning areas on the actual layout.
- Review accessible-route, protruding-object, egress, and fire-code requirements applicable to the project separately.
Furniture on both sides needs particular care. Where opposing items occupy the same cross-section, calculate the remaining width manually as (R = W – D_1 – D_2). Do not add their depths together if they occur at different points along the corridor; calculate each affected cross-section instead. The calculator lists only one furniture-depth input, not separate inputs for opposing items.
For a reception area, distinguish passage width beside furniture from the space reserved in front of a desk. The Reception Desk Front Clearance guide explains a different calculation: adding desk depth and a selected visitor-side allowance to obtain their combined planning depth. That allowance is not automatically a separate, unobstructed corridor.