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On-Base Plus Slugging Calculator.

Calculate baseball OPS from explicit hit, walk, hit-by-pitch, at-bat, and sacrifice-fly counts.

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Set your values

Results update as you type.

On-base percentage: 0.382609

On-base percentage

0.000000
Slugging percentage: 0.47

Slugging percentage

0.000000
OPS (on-base plus slugging): 0.852609

OPS (on-base plus slugging)

0.000000
Total hits: 30

Total hits

0.000000
Plate appearances: 115

Plate appearances

0.000000

Results update automatically as you type.

Use Cases

Evaluate a player's overall offensive contribution

Use the calculator to quickly assess a player's combined ability to get on base and hit for power, which is a key metric for player evaluation.

Example: Input a player's season stats to see their OPS and compare to league averages.

Compare players or track performance over time

Calculate OPS for different players or for the same player across seasons to identify trends or make informed comparisons.

Example: Compute OPS for two shortstops to see who provides more offensive value.

Frequently Asked Questions

What does the On-Base Plus Slugging Calculator compute?
It computes OPS by combining on-base percentage (OBP) and slugging percentage (SLG) from your inputs: singles, doubles, triples, home runs, walks, hit by pitch, at-bats, and sacrifice flies.
How is OPS calculated from the given fields?
OPS = OBP + SLG. OBP = (H + BB + HBP) / (AB + BB + HBP + SF), where H = singles + doubles + triples + home runs. SLG = total bases / AB, where total bases = singles + 2*doubles + 3*triples + 4*home runs.
Why are sacrifice flies included in the calculator?
Sacrifice flies are included because they affect on-base percentage by increasing the plate-appearance denominator. The calculator uses them to compute OBP accurately, as per standard baseball formulas.

Tips & Common Mistakes

Tips

  • Ensure at-bats do not include walks, hit by pitch, or sacrifice flies, as these are entered separately.
  • Double-check that your total hits (singles + doubles + triples + home runs) do not exceed at-bats, as that would be invalid.
  • Use whole numbers for all inputs; the calculator will handle the math automatically.
  • Remember that OPS is a rate stat, so it's best used for comparing players with similar playing time.

Common Mistakes to Avoid

  • Including walks or hit by pitch in the at-bats field, which would incorrectly lower slugging percentage.
  • Forgetting to enter sacrifice flies, which can skew on-base percentage and thus OPS.
  • Using career totals without adjusting for era or league, which can lead to misleading comparisons.

Last updated: August 13, 2026