Quick answer
Slugging percentage = total bases ÷ at-bats, where total bases = singles + 2 × doubles + 3 × triples + 4 × home runs. 80 singles, 25 doubles, 3 triples and 22 home runs in 500 at-bats give 227 bases and .454.
Enter singles, doubles, triples, home runs and at-bats. The calculator returns slugging percentage and total bases.
Related tools: Winning Percentage Calculator: Winning percentage from wins, losses and ties. On-Base Percentage Calculator: Baseball on-base percentage. Basketball Shooting Percentage Calculator: Field-goal, effective field-goal and three-point percentages.
How to use the Slugging Percentage Calculator
- Enter singles (a whole number, 0 or more).
- Enter doubles (a whole number, 0 or more).
- Enter triples (a whole number, 0 or more).
- Enter home runs (a whole number, 0 or more).
- Enter at-bats (a whole number, 1 or more).
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Singles | A whole number | ≥ 0 |
| Doubles | A whole number | ≥ 0 |
| Triples | A whole number | ≥ 0 |
| Home runs | A whole number | ≥ 0 |
| At-bats | A whole number | ≥ 1 |
Formula and method
Formula
SLG = (1B + 2·2B + 3·3B + 4·HR) ÷ at-bats
IEEE-754 double precision; shown to the decimals indicated.
Total bases divided by at-bats. Informational estimate, not medical advice. Talk to a qualified health professional about your own situation.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Singles = 80; Doubles = 25; Triples = 3; Home runs = 22; At-bats = 500.
| Result | Value |
|---|---|
| Slugging percentage | 0.454 |
| Total bases | 227 |
Example 2
Inputs: Singles = 100; Doubles = 20; Triples = 0; Home runs = 0; At-bats = 400.
| Result | Value |
|---|---|
| Slugging percentage | 0.35 |
| Total bases | 140 |
The first line is the headline result (slugging percentage). Below it the slugging Percentage Calculator lists total bases, which describe the same case from other angles. IEEE-754 double precision; shown to the decimals indicated.
What it measures
Slugging measures power: how many bases a batter earns per at-bat. A .454 slugging percentage is above the league average of roughly .400. A home run counts four bases, a single one.
Combined with OBP
OPS adds OBP and SLG. SLG is not a probability and can exceed 1.000. Hits cannot exceed at-bats.
How the result changes with singles
Holding every other input at the first worked example, this table changes only singles. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Singles | Slugging percentage | Total bases |
|---|---|---|
| 40 | 0.374 | 187 |
| 80 | 0.454 | 227 |
| 160 | 0.614 | 307 |
| 320 | 0.934 | 467 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Singles: entering "400" shows "Hits cannot exceed at-bats." beside that field and no result.
- At-bats: entering "0" shows "At-bats must be at least 1." beside that field and no result.
Choosing between the Slugging Percentage Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Winning Percentage Calculator](/fitness/winning-percentage/) | wins, losses and ties count as | Winning percentage |
| [On-Base Percentage Calculator](/fitness/on-base-percentage-calculator/) | hits, walks and hit by pitch | On-base percentage |
| [Basketball Shooting Percentage Calculator](/fitness/basketball-shooting-percentage-calculator/) | field goals made and field goals attempted | Field goal % |
| [Tennis Win Percentage Calculator](/fitness/tennis-win-percentage-calculator/) | matches won and matches lost | Win percentage |
| [Golf Handicap Calculator](/fitness/golf-handicap-calculator/) | adjusted gross scores, course rating for each score and slope rating for each score | Handicap Index |
Background: fitness estimates
Fitness formulas are estimates whose accuracy depends on the input. One-rep-max formulas such as Epley and Brzycki give different answers, and predictions from hard sets of a few repetitions are better than from sets of ten or more. Age-based maximum heart rate formulas can be off by 10 to 30 beats a minute for an individual; Tanaka's 208 − 0.7 × age is generally preferred to 220 − age but is still an estimate.
Pace models built from a race result assume a maximal effort and work best for distances from about 5 km to the marathon. Use the output as a guide, not a prescription.
Assumptions and limitations
- Hits cannot exceed at-bats
- Not a diagnosis
Estimates from formulas describe averages. They are not a training or medical prescription; check with a qualified professional before changing your exercise or diet.
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for singles and at-bats to confirm this.
Frequently asked questions
What is a good slugging percentage?
Above .500 is elite.
Is SLG a percentage?
It is an average, written like one.
What are total bases?
Singles + 2×doubles + 3×triples + 4×HR.
What does the Slugging Percentage Calculator calculate?
Baseball slugging percentage from hit types and at-bats. It returns Slugging percentage and Total bases.
What formula does the Slugging Percentage Calculator use?
SLG = (1B + 2·2B + 3·3B + 4·HR) ÷ at-bats. Total bases divided by at-bats.
What do I need to enter in the slugging Percentage Calculator?
You enter Singles, Doubles, Triples, Home runs and At-bats.
How is the result rounded or limited?
IEEE-754 double precision; shown to the decimals indicated. Hits cannot exceed at-bats.
What are the limits of this calculator?
Hits cannot exceed at-bats. Not a diagnosis.
What is an example of a slugging Percentage result?
With singles 80, doubles 25, triples 3, home runs 22 and at-bats 500, the slugging percentage is 0.454.
Where does the method come from?
The method follows: Official Baseball Rules, 9.02(b).
Can I rely on this calculator for a decision?
Estimates from formulas describe averages. They are not a training or medical prescription; check with a qualified professional before changing your exercise or diet. For this calculator in particular: Hits cannot exceed at-bats.
Related calculators
- Winning Percentage Calculator — Winning percentage from wins, losses and ties.
- On-Base Percentage Calculator — Baseball on-base percentage.
- Basketball Shooting Percentage Calculator — Field-goal, effective field-goal and three-point percentages.
- Tennis Win Percentage Calculator — Match win percentage.
- Golf Handicap Calculator — World Handicap System index from your recent scores.
- Batting Strike Rate Calculator — Cricket batting strike rate.
Sources
- Official Baseball Rules, 9.02(b)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.