Underground → Sherwin Williams
The closest Sherwin Williams matches for Behr Underground (PPU18-02), ranked by perceptual color distance.
Finding a Sherwin Williams Equivalent for Underground
If you love Behr Underground but need a Sherwin Williams alternative, you are not alone. This is one of the most common cross-brand paint matching searches, whether you are working with a painter who prefers Sherwin Williams, your local store does not carry Behr, or you simply want to compare prices across brands before committing.
Underground (PPU18-02) is a dark gray with warm dark charcoal undertones. A warm, dark charcoal-brown. Deeper than Off Broadway, lighter than Granite Boulder. The warm brown gives it an earthy, organic quality at a very dark depth. To find a good Sherwin Williams match, we need a color that captures not just the right depth (LRV 10) but also that specific undertone character. That is where Delta E color science comes in.
We calculated the perceptual color distance between Underground and every Sherwin Williams color using the CIE2000 Delta E formula, which measures how different two colors look to the human eye. A Delta E under 2 means most people cannot tell the colors apart. Between 2 and 4, you might notice a difference in certain lighting. Above 5, the difference is clearly visible side by side.
The results are decent but not perfect. The closest Sherwin Williams option is Peppercorn (SW 7674) with a Delta E of 3.8, which is a "good match" level match. Peppercorn is close. Both are warm, dark charcoals. You will want to test a sample before committing, as the difference may be noticeable in certain lighting.
Sherwin Williams Matches for Underground
Peppercorn is close. Both are warm, dark charcoals.
| Underground | Peppercorn | |
|---|---|---|
| LRV | 10 | 10 |
| Hex | #65625E | #676460 |
| Undertone | Warm Dark Charcoal | Warm Dark Charcoal |
| Family | Gray | Gray |
Undertone Comparison
Underground has warm dark charcoal undertones. A warm, dark charcoal-brown. Deeper than Off Broadway, lighter than Granite Boulder. The warm brown gives it an earthy, organic quality at a very dark depth.
Peppercorn has warm dark charcoal undertones. A warm, rich dark gray with brown undertones. Between Iron Ore and Gauntlet Gray.
These two colors share the same undertone family, which is a good sign for a cross-brand swap. The undertone similarity means they will behave similarly as lighting changes throughout the day, and they should coordinate well with the same accent colors, trim, and furnishings.
How These Colors Behave in Different Lighting
Underground in Your Room
In bright light, the warm brown undertone is visible. In dim rooms, it reads as a warm near-black. A strong, earthy dark neutral.
Peppercorn in Your Room
Warm and dark. Rich without being black. Shows brown warmth in bright light.
LRV and Brightness
Underground has an LRV of 10, while Peppercorn has an LRV of 10. These two colors reflect a very similar amount of light, so you should not notice a significant difference in room brightness when switching between them. The room will feel approximately the same in terms of light and space, which makes this a smoother transition.
Best Rooms for Underground
Behr recommends Underground for: accent wall, front door, cabinets, exterior trim, shutters. With an LRV of 10, this is a dark color that absorbs more light than it reflects. It makes a bold statement and works beautifully on accent walls, front doors, exterior trim, and features where drama is the goal. In a full room, make sure you have good lighting and bright white trim for contrast.
Peppercorn is recommended for: front door, accent wall, cabinets, exterior trim, shutters. The recommended applications differ slightly between brands, but the color's properties should work in the same rooms regardless of which brand you choose. Trust the LRV and undertone data more than the specific room suggestions, and always test in your actual space.
Underground in Other Brands
Looking for Underground equivalents in other brands besides Sherwin Williams? We have matches across all major paint brands.
Frequently Asked Questions
The closest Sherwin Williams match for Underground (PPU18-02) is Peppercorn (SW 7674) with a Delta E of 3.8, which rates as a "good match" match. Peppercorn is close. Both are warm, dark charcoals. Delta E measures perceptual color distance on a scale where under 2 means nearly identical, 2 to 4 means close with subtle differences, and over 5 means clearly noticeable.
No, they are not identical. Underground is a Behr color with warm dark charcoal undertones and an LRV of 10. Peppercorn is a Sherwin Williams color with warm dark charcoal undertones and an LRV of 10. With a Delta E of 3.8, the difference is subtle and mainly visible in direct side-by-side comparison. Paint formulations differ between brands, so even colors with similar values can look slightly different due to pigment concentration, binders, and finish.
With a Delta E of 3.8, the difference is enough that they should not be used on adjacent walls in the same room. You can use them in separate rooms of the same house, but be aware that walking from one room to the other may reveal the difference, especially if the rooms have similar lighting. For the most consistent look, pick one brand for all connected living spaces and reserve the other brand for visually separate rooms like bathrooms or bedrooms behind closed doors.
There are several practical reasons to look for a Sherwin Williams equivalent. Price differences between brands can be significant on large projects. Availability matters if your nearest paint store or home center specializes in Sherwin Williams. Some painters have strong preferences for one brand's formula based on coverage, dry time, or workability. And if you are touching up existing Sherwin Williams work, matching within the same brand gives you the best consistency for seamless results.
Match calculations use Delta E (CIE2000) computed from Lab color space conversion. Color data sourced from manufacturer specifications. Last reviewed: March 22, 2026.