Assist-to-turnover ratio divides assists by turnovers, so it tells you how many assists a player creates for each turnover and nothing about how many times he handled the ball. Two players can post the same ratio on very different workloads. Here is the formula, a side-by-side example, and the stats that fill in what the ratio leaves out.
What the formula does
AST/TOV = Assists ÷ Turnovers
The NBA's official stats glossary defines AST/TO as "the number of assists for a player or team compared to the number of turnovers they have committed." It defines an assist as a pass "that lead[s] directly to a made basket" and a turnover as occurring "when the player or team on offense loses the ball to the defense."
The Assist-to-Turnover Ratio Calculator performs exactly that division. It asks for turnovers greater than 0, because the ratio is undefined when the denominator is zero: a player with 6 assists and 0 turnovers gets an error message instead of a ratio.
Worked example: same ratio, different jobs
These are illustrative stat lines, not real players' games.
| Player | Assists | Turnovers | AST/TOV |
|---|---|---|---|
| Player A | 4 | 2 | 2.0 |
| Player B | 10 | 5 | 2.0 |
Player A: 4 ÷ 2 = 2.0
Player B: 10 ÷ 5 = 2.0
The calculator returns 2.0 for both. Player B created two and a half times as many baskets for teammates and also gave the ball away two and a half times as often. The ratio treats the two lines as identical because dividing removes the volume. A ratio of 2.0 means two assists per turnover; it does not say whether that came over 4 assists or 10.
What the ratio leaves out
The NBA glossary lists measures that bring the volume back in:
- Assist Percentage (AST%) is "the percentage of teammate field goals a player assisted on while they were on the floor," with the formula AST / (TmFGM − FGM). It scales assists to the baskets teammates made while he played, not to his turnovers.
- Turnover Percentage (TOV%) is the "percentage of plays that end in a player or team's turnover." This puts turnovers against the number of plays, so a high-usage player can be compared with a low-usage one.
- Turnover Ratio (TO Ratio) is "the number of turnovers a player or team averages per 100 possessions used," calculated as (TO × 100) / POSS.
AST/TOV uses none of these denominators. Its only inputs are the two raw counts, which is why it is quick to compute from a box score and why it cannot separate Player A from Player B.
Assumptions
- The counts are for one game or one season, and you choose which. A single game's ratio swings with one extra turnover: Player A at 4 assists and 3 turnovers is 1.33, not 2.0 (4 ÷ 3 = 1.333).
- The definitions of assist and turnover are the NBA's, quoted above.
Last reviewed: October 2026. Informational only, not professional advice.
Sources
- NBA.com Stats Glossary: definitions of AST/TO, AST, TOV, AST%, TOV% and TO Ratio, quoted above.