Average Seed Round Size in 2026: Use the Median, Not the Headline
The median US seed round in 2026 is about $3 million to $4 million raised on a median post-money valuation that hit a record $24 million in late 2025, per Carta's benchmarks. The mathematical average runs higher, near $5.6 million, because a small number of outlier AI rounds pull it up. This page consolidates the stage-by-stage numbers from Carta, PitchBook-NVCA, and AngelList reporting so you can benchmark a raise or a deal without repeating the average-vs-median confusion.
The headline numbers
- Median seed round (US): ~$3.1M all-industry aggregate; Carta's priced-seed benchmark puts it at ~$4.1M for its panel (H2 2025 window, published July 2026).
- Average seed round: ~$5.6M, inflated by billion-dollar outlier rounds. Never plan against an average.
- Median seed post-money: $24M-$24.3M (Carta, Q4 2025), up from ~$18M in Q4 2024, an increase driven largely by AI deals.
- Median seed dilution: 18-20%, with 19.5% the Carta figure most cited.
- Top-decile seed: consensus pre-money near $40M (PitchBook, Q4 2025), roughly 3x the market median; tier-one-led rounds of $5M-$10M.
Why the average misleads
Seed round sizes are heavily right-skewed: most rounds cluster between $1.5M and $5M, while a handful of AI mega-rounds land at $20M or more. A single fund's headline "average seed round" can double on one outlier. PitchBook-NVCA's Q1 2026 Venture Monitor illustrates the fragility: removing just five deals cut headline deal value by 73%. Medians resist that distortion, which is why every benchmark on this page leads with the median and treats the average as a curiosity.
Seed in context: the full ladder
To see how seed sits in the funding ladder, the neighboring stages on the same datasets:
- Pre-seed: $750K-$1.5M raised (median ~$1M), typically on SAFEs with caps of $10M-$15M rather than priced equity.
- Seed: $2M-$5M typical band, median $3M-$4M, record $24M median post-money.
- Series A: median $19.6M deal at $78.7M post-money (PitchBook-NVCA, Q1 2026); non-AI rounds price closer to $40-$42M pre-money.
- Series B: ~$40M median deal on $120M-$160M+ post-money.
The pattern investors should internalize: round sizes have stayed comparatively flat while valuations, especially for AI companies, have moved sharply. Seed is not bigger in 2026; it is more expensive.
Sector and geography splits that matter
Industry changes the answer materially. Aggregated 2026 deal data puts AI and healthcare seed rounds at $4M-$5M while consumer apps run $1.5M-$2.5M. More than 60% of capital Carta recorded in Q1 2026 went to AI companies, and AI/ML startups took 41.5% of AngelList deal share in H1 2025. Geography moves it just as much: European seed checks from new funds typically run €500K-€2.5M, Africa's median seed rose to ~$1.6M in 2025, and Latin American seed rounds generally sit below the US median.
What seed benchmarks do not tell you: who is about to raise
Every number above describes rounds that already closed. None of it tells you which team is raising next month, which is the question deal flow actually turns on. That is a leading-indicator problem: GitDealFlow tracks public GitHub engineering activity (commit velocity, contributor growth, repository expansion) across 350+ startup organizations in 15 sectors, refreshed weekly, and breakout teams surface 21 to 47 days before their round is announced. Investors use the seed benchmarks on this page to size the check, and the momentum data to decide who deserves it. The full research data hub has the adjacent datasets, and the deal flow signal explainer covers the method.
How this page is built
Figures on this page are consolidated from public benchmark reporting: Carta's seed and valuation datasets (Q4 2025 through Q1 2026 publications), the PitchBook-NVCA Venture Monitor (Q1 2026), AngelList's H1 2025 deal coverage, and aggregated industry deal data. Where sources disagree (they do, mostly on what counts as "seed"), both figures are shown. Medians are preferred to averages throughout, and every claim is hedged to its source window. This is the same reproducibility standard the published deal flow signal methodology holds itself to.
Frequently Asked Questions
What is the average seed round size in 2026?
The median US seed round runs about $3.1M-$4.1M depending on dataset and window: Carta's benchmark puts priced seed near $4.1M, all-industry aggregates near $3.1M. The mathematical average is around $5.6M, inflated by outlier AI rounds. Plan against the median.
What is the median seed valuation in 2026?
Carta put the median seed post-money at a record $24M-$24.3M in Q4 2025, up from about $18M a year earlier, with median dilution around 18-20%.
How much do AI startups raise at seed?
AI and healthcare rounds typically run $4M-$5M, and over 60% of capital Carta recorded in Q1 2026 went to AI companies. Non-AI rounds price closer to the market median.
What about pre-seed and Series A sizes?
Pre-seed: about $750K-$1.5M (median ~$1M) on $10M-$15M SAFE caps. Series A: median $19.6M deal at a $78.7M post-money (PitchBook-NVCA, Q1 2026); non-AI Series A closer to a $40-$42M pre-money.