# CLV calculator (closing line value)

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Canonical: https://novigapi.com/clv-calculator
Method checked: 2026-11-12
Interactive tool: https://novigapi.com/clv-calculator (prefill with ?a=&b=)

Closing line value compares the price you took with the fair closing price. Taking +110 when the close devigs to 50.98% gives CLV of 2.72% as EV at the close. Novig's daily CSVs at data.novig.com publish each market's close back to 3 Aug 2026 (checked 12 Nov 2026).

## Worked example

Worked example: took +110, closed -105 / -115

|  | Probability | American |
| --- | --- | --- |
| Your price | 47.62% | +110 |
| Close, fair | 48.92% | +104 |
| CLV, EV at close | 2.72% |  |
| CLV, probability points | 1.30 pp |  |

```
CLV (EV at close) = D_entry x p_close_fair - 1
CLV (points) = p_close_fair - p_entry
```

The closing price is the market's best estimate once all information is in. Beating it consistently is the most reliable sign that a bettor has an edge, long before results prove it. Devig both sides of the close first, or the margin makes every bet look worse than it was.

On Novig the close of a two-sided market is close to fair already. This API keeps intraday line history and closing prices for every market, with names resolved, and the clv endpoint returns CLV for a market or a player directly.

## How to use it

1. Enter the price you took.
2. Enter the closing price on your side and, if you have it, the other side.
3. Read CLV as EV at the close and in probability points.

## Questions

### What is a good CLV?

Consistently positive CLV of 1-3% is a strong sign of an edge. A single bet's CLV says little; track it across hundreds.

### Where can I get closing lines?

Novig's daily CSVs carry each market's close back to 3 Aug 2026. This API adds names and intraday history.

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