Koffing

Base · #51/102 · Common · 1999

$0.71

Market price ▲ 1.4% (30d)

Prices as of Jul 26, 2026

Unlimited Shadowless 1st Edition

HP 50GrassBasicArt · Mitsuhiro Arita

6,222graded pop

19%gem rate

3.7×PSA 10 vs raw

-29%off ATH $2.48 · Jul 2026

−$16.03EV to grade — don't

Printings & price history

Unlimited▼ 9.0% 7d$0.71

Low $0.15Mid $0.52

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Graded values

updated 2026-07-26

Grade 6 est.$1.66

Grade 5 est.$1.40

Grade 4 est.$1.16

Grade 3 est.$0.96

Grade 2 est.$0.79

Grade 1 est.$0.67

Grades 1–6 are estimates modeled from the raw price — PSA/CGC/BGS 7–10 and Ungraded are live tracked market values.

PSA 10 price history$125.00

PSA 10 chart is building — graded values are tracked nightly, a new point appears each day.

Graded population census · updated 2026-07-07

CGC1,621 graded · 261 gem 10

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PSA143 graded · 54 gem 10

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Population data from PriceCharting, updated monthly.

Attacks

10Foul Gas

Flip a coin. If heads, the Defending Pokémon is now Poisoned; if tails, it is now Confused.

“Because it stores several kinds of toxic gases in its body, it is prone to exploding without warning.”

How much is Koffing #51/102 worth?

As of July 26, 2026, Koffing #51/102 from Base sells for around $0.71 in raw, ungraded condition. Across the 3 printings we track, copies run anywhere from $0.15 to $9,999.00 depending on the version you're holding.

Grading changes the math on this one: a PSA 10 is valued around $125.00, roughly 176.1x the raw price, while a PSA 9 sits near $23.40. 2,699 copies have been graded to date, and 23% of them came back a 10 — worth knowing before you pay grading fees.

We update this valuation every night from live market data and verify it against real completed sales — see the chart above for how Koffing has moved over time.