Quick answer: most seeds sit in a tight calorie range — roughly 45–60 calories per tablespoon and 150–180 calories per ounce (28g). The “lowest calorie seed” depends on whether you compare by tablespoons (volume) or by grams (weight).
If you just want the numbers, the full comparison table is below. If you’re tracking calories, focus on the ounce (28g) column — it’s the most consistent unit.
This page is the master comparison hub: a clean chart, the serving-size reality, and a simple (weight-loss friendly) way to use seeds without accidentally turning them into a “handful habit.”
If you want the full tablespoon-to-gram breakdown first, see the Seed Serving Size Guide. If you want detailed calorie numbers by seed, I’ve linked those pages below.
Jump to
- Calories table (tbsp, oz, 100g)
- Why tablespoons can mislead
- Which seeds are highest/lowest calories?
- Calories + weight loss: practical rules
- How to use seeds without overeating
- Seed-by-seed notes + links
- FAQ
Seed calories comparison table (tbsp, ounce, 100g)
These ranges are intentionally practical. Exact numbers can vary by brand, roasting, and whether oil is added — but this is accurate enough for comparison and portion planning.
| Seed | Calories (1 tbsp) | Calories (2 tbsp) | Calories (1 oz / 28g) | Calories (100g) | Notes |
|---|---|---|---|---|---|
| Chia | 55–60 | 110–120 | 160–170 | 480–500 | Very dense; high fiber; usually used in smaller portions |
| Flax | 35–45 | 70–90 | 150–160 | 530–550 | Looks “lower” per tbsp because it’s lighter by volume |
| Hemp (hemp hearts) | 55–60 | 110–120 | 160–170 | 550–570 | Strong protein for a seed; easy to add multiple tablespoons |
| Pumpkin (pepitas) | 45–55 | 90–110 | 150–170 | 550–600 | Easy to overeat by handful; common snack seed |
| Sunflower | 50–55 | 100–110 | 160–170 | 570–590 | Similar to pumpkin by weight; portion creep is common |
| Sesame | 50–55 | 100–110 | 160–170 | 560–580 | Often eaten as tahini; “real” serving behavior matters |
Note: Roasting changes moisture a bit; calories per gram don’t change much. The bigger swing comes from added oil (and sometimes sugar coatings). If you track closely, use the package label and weigh once.
Want exact numbers for your own scoop size? Use the tool: Seed Calorie Calculator.
The serving-size reality (why tablespoons can mislead)
Most people compare seed calories using a tablespoon because it’s easy. The problem is that a tablespoon measures volume, not weight.
- Loose scoop vs packed scoop: grams can swing enough to change calories by ~20–30%.
- Different seed shapes: flax and sesame pack differently than chia or pumpkin.
- Labels are in grams: the “true” comparison is grams or ounces.
If you want a simple rule: pick one unit and stick to it.
Want the full tablespoon vs grams breakdown for everyday measuring? See the Seed Serving Size Guide.
- Fast comparisons: use 1 tablespoon everywhere (consistent unit).
- Accurate tracking: use grams or 1 oz / 28g.
Calories per gram (the real equalizer)
By weight, seeds are closer than people think. A practical range is:
- 5.5–6 calories per gram for most common seeds
So:
- 10g ≈ 55–60 calories
- 20g ≈ 110–120 calories
- 28g (1 oz) ≈ 150–170 calories
This is why seed choice rarely “solves” calorie control. The bigger lever is the portion you actually eat — especially if you eat seeds daily.
Why most seeds cluster around 5.5–6 calories per gram
Most edible seeds are high in fat by weight. Since fat provides 9 calories per gram, calorie density ends up in a tight band for many common seeds. The smaller differences come from how much protein, fiber, and carbs a seed has — but the overall range stays surprisingly consistent.
That’s why portion size (what you actually scoop or snack) usually matters more than which seed you pick.
Which seeds are highest/lowest calories?
Let’s separate two questions that often get mixed:
- Lowest calories per tablespoon (volume-based)
- Lowest calories per gram (weight-based)
Lowest calories per tablespoon
Flax is usually lowest per tablespoon. That’s largely a density effect: a tablespoon of flax often weighs less than a tablespoon of chia or hemp. If you’re a “sprinkle user” (1 tbsp on oats/yogurt), flax gives the most forgiveness.
See the detailed flax page: flax seed calories per tablespoon and per gram.
Highest calories per tablespoon
Chia and hemp often sit at the higher end per tablespoon. The difference is not dramatic — but if you use 2–3 tablespoons daily, those small differences become real over time.
- Chia details: chia seed calories per tablespoon (plus 2 tbsp)
- Hemp details: hemp seed calories per tablespoon and per ounce
Highest calories per 100g (weight-based)
By weight, sunflower, pumpkin, sesame, and hemp generally cluster near the top (again: the range is tight). This matters most if you snack by handful — because handfuls usually mean 2–3 ounces without realizing it.
Calories + weight loss (the honest framing)
Seeds can absolutely fit into weight loss. In fact, they can help with:
- satiety (fat + fiber + some protein)
- meal structure (a planned topping instead of random snacking)
- nutrient density (magnesium, zinc, vitamin E, omega-3 ALA depending on seed)
But seeds are also calorie-dense. The most common mistake pattern is simple: you stop measuring, and seeds become a “handful habit.” That’s how a healthy food quietly turns into a calorie surplus.
If weight loss is the goal, the best strategy is boring — and boring works:
- Choose a default serving (often 1 tbsp or 1 oz / 28g).
- Use it in a meal (yogurt, oats, salad), not as a snack you eat mindlessly.
- If you snack on pumpkin/sunflower, pre-portion them.
For seed-by-seed weight-loss recommendations, use: Best seeds for weight loss.
Weight-loss friendly “default servings” (practical examples)
These aren’t medical rules — just practical defaults that work for most people:
- Chia: 1 tbsp daily (55–60 calories). 2 tbsp is fine if planned.
- Flax: 1 tbsp daily (35–45 calories), or 2 tbsp if you’re using it as a fiber add-on.
- Hemp: 1 tbsp daily (55–60 calories); 2 tbsp can be great in smoothies, but measure it.
- Pumpkin/Sunflower: start with 1 oz (150–170 calories). Handfuls grow fast.
- Sesame: sprinkle portions are small; tahini servings are easy to overshoot.
How to use seeds without overeating (the “portion control loop”)
If you want seeds to help you (instead of quietly increasing calories), use one of these simple loops:
Loop 1: “Measured topping”
Pick one meal per day where seeds are a measured topping. Example: 1 tbsp chia in yogurt. Don’t spread seeds across five meals without measuring — that’s how totals drift.
Loop 2: “Replacement, not addition”
If you add seeds, remove something else. Example: seeds replace chips/crackers, or seeds replace part of a snack. Seeds on top of everything is how calorie totals creep up.
Loop 3: “Pre-portion the snack seeds”
Pumpkin and sunflower seeds are the classic snack seeds. If you eat them from a bag, you’ll almost always overshoot. Pre-portion into 1 oz containers and you’re done.
Want a quick sanity check for your portion? Use: Seed Calorie Calculator.
Seed-by-seed notes + links (go deeper)
This hub is the comparison view. If you want the full details for each seed (serving sizes, per tablespoon breakdown, common portion mistakes), use these:
- Chia calories per tablespoon (and 2 tbsp examples)
- flax seed calories per tablespoon and per gram
- hemp seed calories per tablespoon and per ounce
- Pumpkin calories per tablespoon
- Low calorie seeds guide
Sunflower and sesame are included in the chart here because they’re common in real diets and comparisons. Their dedicated pages can be added next without changing this hub’s purpose.
Bottom line
- Most seeds land around 150–170 calories per ounce (28g).
- Per-tablespoon differences are often a density thing (volume vs weight).
- If weight loss is the goal, the biggest lever is portion control, not “the lowest-calorie seed.”
FAQ
How many calories are in 2 tablespoons of seeds?
Most seeds contain 90–120 calories in 2 tablespoons, depending on density and how tightly you scoop. Chia and hemp are usually near the higher end, while flax is often lower because it tends to weigh less per tablespoon. For consistent tracking, weigh your typical scoop once and reuse that gram amount.
Are seeds too high in calories for weight loss?
No. They’re just easy to overeat. Measured servings work well; unmeasured handfuls don’t.
What’s the easiest portion rule for everyday use?
Pick a default and make it boring: 1 tablespoon daily (or 1 ounce for snack seeds). Consistency beats perfect math.
Is flax really “lower calorie” than chia?
Per tablespoon, flax is often lower because a tablespoon weighs less. Per gram, they’re closer. The better question is: what portion do you actually eat daily?
Does roasting change calories?
Not much per gram. Added oil can change calories a lot. Plain roasted seeds are usually close to raw in calorie density.