Slugging Percentage Calculator (Baseball)
Baseball SLG & OPS Power Studio
Measure your hitting power. See what every base adds.
Your Power & OPS Dashboard
Illustrative comparison band.
.355 OBP + .530 SLG
Enter an optional OBP to calculate OPS.
Your Hit Distribution
No hits recorded. Distribution percentages are undefined.
From Your Total Bases
265 total bases ÷ 500 at-bats = .530 SLG
Switch to Hit breakdown to see the distribution and calculate ISO. No hit mix is inferred from total bases.
Player Comparison
A − B: +.061 SLG · +.076 OPS
Illustrative SLG bands; league, season and sample size matter.
What If Five Singles Became Home Runs?
Upgrade existing hits. Keep at-bats, total hits and OBP unchanged.
85 singles + 30 doubles + 5 triples + 30 home runs = 280 total bases.
Home-run scenarios need the number of singles available. Quick totals alone cannot provide that information.
Calculation & Assumptions
TB = 1B + 2 × 2B + 3 × 3B + 4 × HR
SLG = TB ÷ AB
OPS = OBP + SLG
Worked example:
(90 + 60 + 15 + 100) ÷ 500 = .530
Use official stats from the same period. Walks do not enter SLG. With zero at-bats, SLG is undefined.
Total bases count bases credited through hits, not steals or later advancement. Entered OBP is used as supplied. Calculations keep full precision; rates display to three decimals. Bands follow the displayed SLG and are illustrative.
Read the Power Behind Your Hits
Slugging percentage (SLG) counts bases per at-bat, showing how much power a hitter brings to each official at-bat. Extra-base hits receive more weight than singles.
On-base plus slugging (OPS) combines reaching base (OBP) with power (SLG). Enter OBP for the same period to add this second view of offensive production.
Isolated power (ISO) is SLG minus batting average: (2B + 2 × 3B + 3 × HR) ÷ AB. It separates extra-base production from singles. SLG and ISO are not percentages capped at 1.000.
Quick totals provide SLG and optional OPS, but not the hit distribution, total hits or ISO. Comparisons and scenarios do not predict future performance.
Frequently Asked Questions
Can SLG be greater than 1.000?
Yes. SLG counts bases per official at-bat. It ranges from .000 to 4.000 when at least one at-bat exists. A home run in every at-bat gives 4.000. SLG is not a probability. OPS can also exceed 1.000.
What if I do not know my OBP?
Leave OBP blank. The tool still calculates SLG, total bases, hits and ISO from a hit breakdown, while hiding OPS. An entered zero OBP is a number, not a missing value. Use the linked OBP Calculator if you have the required official counts.
How is isolated power (ISO) calculated?
ISO = SLG − batting average = (2B + 2 × 3B + 3 × HR) ÷ AB. It measures extra-base production per at-bat. Quick totals do not give total hits, so this tool does not invent ISO from them. With zero at-bats the rate is undefined.
How does the home-run scenario work?
It replaces a chosen number of existing singles with home runs. Each replacement adds three total bases. At-bats, total hits and the entered OBP stay fixed. Five replacements in the example add 15 bases, giving .560 SLG and .915 OPS. It is a hypothetical change, not a prediction.
About this calculator
Slugging percentage is a baseball rate and is normally written as a decimal such as .400.
Sources & References
MLB · Slugging PercentageSLG definition and counting formula.MLB · On-base Plus SluggingHow OBP and SLG combine.MLB · Total BasesBases credited from each hit type.Definitions referenced from MLB. Independent educational tool; no institutional endorsement. Comparison bands are ST illustrations, not official player awards or a current MLB average. Sources checked 20 October 2026. Athlete and equipment imagery is generated.
Measure your hitting power. See what every base adds.