Paint chips lie a little — not on purpose, but because a 2-inch swatch under fluorescent store lighting has almost nothing in common with a wall under your room's actual light. Two numbers on a can explain most of what goes wrong: LRV and undertone.
Start with LRV, not the color name
LRV (Light Reflectance Value) measures how much light a color bounces back, on a scale from 0 (absolute black) to 100 (pure white). It's a better predictor of how a color will feel in your room than its name or its position on a swatch card.
- LRV under 25 — reads dark in most rooms, especially with limited natural light.
- LRV 25–56 — the medium range where most "greige" and mid-tone colors live.
- LRV 56 and up — reads light and reflects the most light back into a room.
You can browse colors by brightness on our colors directory, which buckets every color into light, medium, or dark using this exact LRV math.
Undertone is what fights you later
Undertone is the secondary tint hiding underneath a color's primary hue — a "white" with a yellow undertone, or a "gray" with a blue or green undertone. It's invisible on the chip and obvious on the wall, especially next to trim, cabinetry, or flooring with their own undertones.
The fix isn't a better guess — it's a bigger sample. Paint a piece of poster board (not the wall directly) and move it around the room across a full day, including after dark under your actual bulbs.
Match before you commit
If you already have a color you love in one brand and need the equivalent in another, compare pages show colors side by side with real room photos, or use color match to find the closest equivalents by Lab color distance rather than by name.