DRAFT CHALLENGER
The number, then the game

Slugging percentage calculator.

Total bases over at-bats, measured against the biggest power seasons ever — then draft an all-time nine below.

Your slugging percentage.559a genuine power threat

SLG = total bases ÷ at-bats

Famous single-season slugging marks

  • .863Barry Bonds · 2001
  • .847Babe Ruth · 1920
  • .765Lou Gehrig · 1927
  • .686Aaron Judge · 2022

Numbers this good belong on a roster. Draft an all-time nine and run the season.

ROUND 01
SPIN THE ERA
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Stats on every card.
Roster
12 picks · seats read the era they come from
Player years
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Position changes
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Teams
Erasevery era on the board
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Baseball record book

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The rules
01SPIN

Every spin lands a franchise era — anywhere greatness happened. One legend era guaranteed per run.

02DRAFT

12 seats, your order — tap any open seat to spin it. Every pick flips the card: the honors, the rings, the real numbers.

03SURVIVE

A hundred sixty-two regular-season games, wire to wire — every lineup and rotation seat counts. Go 162-0 and you’re immortal.

10,666player-seasons
1871–todaya century and a half
162games to survive
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Total bases over at-bats, measured against the biggest power seasons ever — then draft an all-time nine below.

FAQ

Questions people actually ask

How is slugging percentage calculated?

Total bases divided by at-bats: a single counts one base, a double two, a triple three, a home run four. It is a per-at-bat weight of raw power, not a percentage of anything.

What counts as a good slugging percentage?

League average floats around .400–.420 in the modern game. Regulars over .550 are real power threats, .690 lives on MVP ballots, and .800 has been touched only by Babe Ruth and Barry Bonds.

Whose slugging season is the best ever?

Barry Bonds slugged .863 in 2001, passing Babe Ruth’s .847 from 1920 — a record that had stood for eighty-one years.

Why can slugging exceed 1.000?

Because it is total bases per at-bat, not a true percentage. A player who homered in every at-bat would slug 4.000 — the scale simply tops out at four.

Slugging or OPS — which should I use?

Slugging isolates power; it ignores walks entirely. OPS adds on-base percentage on top, which is why it became the quick shorthand for a hitter’s whole line.