Pokémon · Single card

Koffing

Base · Base

GrassPokémonBasic

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Number

51/102

Rarity

Common

HitBinder Price

~£0.72

Estimate · ungraded

PSA 10

~£272.39

graded · Estimate

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Price by condition

£0.72

£0.38

£0.28

£0.26

NM is the HitBinder Price; the rest use real per-condition ratios from our price archive.

Price history

▲ 13.0%

2026-04-30low £0.46 · high £0.69£0.61

— — PSA 10 shown on its own scale (a slab often trades many times raw).

Grade analysis

2,742 graded by PSA · 23% gem rate

PSA 10

631 · 23%

£272.4

PSA 9

1,096 · 40%

£78.7

PSA 8.5

14 · 0.5%

£31.2

PSA 8

555 · 20.2%

£31.2

PSA 7

243 · 8.9%

£16.8

PSA 6

105 · 3.8%

£16.8

PSA 5

59 · 2.2%

£16.8

PSA 4

24 · 0.9%

£12.9

PSA 10 uplift

378.3×

Gem rate

23%

Net if it 10s

£246.7

Population and per-grade prices from our price archive · printing: first Edition Shadowless. “Net if it 10s” assumes a ~£25 grading cost and is not a guarantee — the gem rate is the odds it actually grades a 10.

PSA 10 by printing

Vintage printings grade very differently — check which one you hold.

Printing	PSA 10	Pop	Gem rate
Shadowless	~£314.64	161	20.1%
1st Ed. Shadowless	~£272.39	631	23%
Unlimited	~£97.92	392	28.2%

The HitBinder Price is our trust-weighted estimate (archive blend), shown in your chosen display currency (switch it top-right); PSA 10 reflects recent graded sales. Indicative, not quotes — condition, grading and printing variance apply.

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Price trend

▼ 43.8% · 11 wks

Card details

HP 50Retreat 1Weakness Psychic ×2

Foul 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.

Illustrated by Mitsuhiro Arita

Base

Base · 102 cards · 1999-01-09

Card analytics

Market snapshot

Supply & demand

0for sale

0wanting

No members selling or wanting this yet.

Share of set value

<0.1%

£0.72 of £1,563.40 across the whole set.

Value rank in set

#75/ 102 priced

Ahead of 27 priced cards in the set.

Price stats

11 weekly snapshots

Low

£0.72

Average

£1.03

High

£1.28

Members selling this

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