A dollar of dry brown lentils buys 77.7 grams of protein. A dollar of boneless skinless chicken breast buys 24.5. That’s a 3.2x gap, which isn’t a rounding error, it’s a different grocery bill. The honest caveat is that lentil protein isn’t as usable by your body as chicken protein, so the gap narrows once you adjust for quality. It doesn’t close.
| Brown lentils (dry) | Chicken breast (boneless, skinless) | |
|---|---|---|
| Protein per $1 | 77.7 g | 24.5 g |
| Protein per 100 g | 24.63 g | 22.5 g |
| Package | 16 oz bag | per lb |
| Price | $1.44 | $4.17 |
| Price per 100 g | $0.32 | $0.92 |
| DIAAS (protein quality) | 0.63 | 1.08 |
| Quality-adjusted protein per $1 | 49.0 g | 24.5 g |
Source: USDA FoodData Central + single-store US prices, July 2026. Full methodology at /methodology/.
Which is actually cheaper per gram of protein?
Lentils, and it isn’t close. Here’s the part that surprises people: the two foods are nearly tied on protein density. Dry brown lentils carry 24.63 grams of protein per 100 grams. Chicken breast carries 22.5. The lentils are actually slightly ahead.
The entire gap is the price tag. A 16 ounce bag of brown lentils costs $1.44, which works out to about 32 cents per 100 grams. A pound of boneless skinless chicken breast costs $4.17 at the May 2026 national average, or about 92 cents per 100 grams. Nearly three times the money for slightly less protein. Nobody expects the cheap bag on the bottom shelf to beat the thing everybody buys in bulk for meal prep, but the receipt says what it says.
Does protein quality close the gap?
This is where most cheap-protein articles quietly change the subject, so let’s not. Protein quality gets scored with DIAAS, which measures how much of the protein your body can actually put to work. Chicken breast scores 1.08. Brown lentils score 0.63, mostly because they run short on the sulfur amino acids.
Run the penalty through the price and lentils land at about 49.0 grams of quality-adjusted protein per dollar. Chicken breast stays at 24.5, since scores above 1.00 get capped for this kind of math. So the gap drops from 3.2x to roughly 2x. Lentils still win, they just win by less than the sticker math suggests.
The fix is older than the research. Legumes and grains complement each other’s amino acid profiles, which is why beans and rice has fed most of the planet for most of history. Serve your lentils with rice or bread and you’re not really relying on the 0.63 anymore.
Does cooking time change the math?
Usually the argument for paying more per gram is that meat saves you time. Not here. Brown lentils simmer in about 20 to 25 minutes with no soaking, which is roughly what a chicken breast needs in the oven. Call it a tie.
What lentils do ask for is flavor. A plain simmered lentil is a sad thing, and I say that as someone who eats them twice a week. Toast your spices in the oil first. A lentil curry or a pot of dal and rice costs about the same as a single chicken breast and feeds four people, which is the actual point of the 3.2x.
When is chicken breast still the right buy?
More often than the numbers make it look. Chicken breast gives you the highest-quality protein in the smallest volume of food, and that matters if your appetite runs out before your protein target does. The lentil figure is for dry lentils, and dry lentils drink a lot of water on the stove. Getting 40 grams of protein from lentils means eating a genuinely large bowl. Getting it from chicken means eating a piece of chicken.
Chicken also wins on the boring stuff that decides what actually gets cooked. It shreds into salads, it grills, it survives picky eaters, and a properly cooked chicken breast is a dinner without needing anything else on the plate. If lentils twice a week and one-pot chicken and rice on Thursday is what keeps the kitchen running, that’s a better plan than an all-lentil spreadsheet you abandon in nine days.
Buy the lentils because they’re cheap and they may add fiber your week is probably short on. Buy the chicken because you’ll eat it. The households that spend the least on protein aren’t the ones that picked a side, they’re the ones that let the cheap stuff carry the volume. For the full ranking, see our protein per dollar study, and for how to build a week around it, the high protein on a budget guide has the strategy.
