# Odds calculator

An odds calculator turns a price and stake into total return, net profit and implied probability. Total return is stake multiplied by decimal odds; net profit subtracts the stake. Enter American, decimal or fractional odds to see the same bet in comparable terms, before any taxes or fees.

Canonical page: https://getoddsapi.com/odds-calculator

## Free API key

Get a free GetOdds API key: **1,000 requests per UTC day and 60 per minute, no card**. One key covers REST and the hosted MCP server.

Sign up: https://getoddsapi.com/sign-up?ref=ai-claudebot

## Quickstart

1. Create an account at https://getoddsapi.com/sign-up?ref=ai-claudebot, open https://getoddsapi.com/dashboard and issue a key with the sources you need (draftkings, fanduel, betrivers, prizepicks or underdog). Keep it in a server environment variable named GETODDS_API_KEY.
2. Read current DraftKings NBA spreads with curl:

```bash
curl --fail-with-body "https://getoddsapi.com/api/v1/odds?sport=NBA&market=spread&fresh_only=true&limit=50" \
  -H "Authorization: Bearer $GETODDS_API_KEY"
```

3. The same request in Python (standard library only):

```python
import json, os, urllib.request

req = urllib.request.Request(
    "https://getoddsapi.com/api/v1/odds?sport=NBA&market=spread&fresh_only=true&limit=50",
    headers={"Authorization": "Bearer " + os.environ["GETODDS_API_KEY"]},
)
with urllib.request.urlopen(req) as res:
    rows = json.load(res)["data"]
for row in rows:
    print(row["away"], "at", row["home"], row["side"], row["line"], row["american"], row["observed_at"])
```

4. Check `observed_at`, `age_seconds` and `stale` on every row before using a price. Full reference: https://getoddsapi.com/docs

## Use with Claude (MCP)

```bash
claude mcp add --transport http getodds https://getoddsapi.com/api/mcp \
  --header "Authorization: Bearer $GETODDS_API_KEY"
```

The MCP tools follow the key's source grants and share its allowance. Setup guide: https://getoddsapi.com/use-with-claude

## Pricing

| Plan | Allowance | Price |
| --- | --- | --- |
| Free key | 1,000 requests a day, 60 a minute | $0, no card |
| Developer Bundle | 10,000 requests or credits a month on each of four sources | $149 a month |

Free development allowance: 1,000 requests per UTC day and 60 per minute per account, with no payment step. Paid: the Developer Bundle at $149 per month, with 10,000 monthly requests or credits on each of four sources.
Details: https://getoddsapi.com/bundle

## Calculator


Canonical page: https://getoddsapi.com/odds-calculator
Markdown version: https://getoddsapi.com/odds-calculator.md
Language: English. Formula review date: 2026-11-06.

An odds calculator turns a price and stake into total return, net profit and implied probability. Total return is stake multiplied by decimal odds; net profit subtracts the stake. Enter American, decimal or fractional odds to see the same bet in comparable terms, before any taxes or fees.

## Inputs

| Input | Default example | Instructions |
| --- | --- | --- |
| Odds | -110 | American -110 / +150, decimal 2.50, fractional 3/2, or 40%. |
| Stake ($) | 100 | Cash risked, before any winnings. |

## Formula

Return = stake × decimal odds. Profit = stake × (decimal odds − 1).

## Worked example

At −110, a $100 stake returns $190.91 including the stake, for $90.91 net profit.

| Result | Value | Working |
| --- | --- | --- |
| Total return | $190.9091 | 100 × 1.909091 |
| Net profit | $90.9091 | 100 × (1.909091 − 1) |
| Implied probability | 52.381% | 100 ÷ 1.909091 |

## Assumptions and limits

A payout is conditional on winning. Settlement rules, fees, deductions and taxes can change the amount received.

Inputs are supplied by the user. These calculators do not fetch live sportsbook prices, estimate a win probability, or recommend selections. Monetary examples use USD. Calculations run in the browser without an account. A shared calculation URL contains its entered numbers.

## Questions and answers

### How does the odds calculator work?

An odds calculator turns a price and stake into total return, net profit and implied probability. Total return is stake multiplied by decimal odds; net profit subtracts the stake. Enter American, decimal or fractional odds to see the same bet in comparable terms, before any taxes or fees.

### What is the formula?

Return = stake × decimal odds. Profit = stake × (decimal odds − 1).

### Can you show a worked example?

At −110, a $100 stake returns $190.91 including the stake, for $90.91 net profit.

### What assumptions should I check?

A payout is conditional on winning. Settlement rules, fees, deductions and taxes can change the amount received.

### Does the result include the original stake?

Total return includes a cash stake; net profit subtracts it. A stake-not-returned bonus is explicitly treated differently. Probability and margin outputs are percentages, not cash payouts.

### Can I share my calculation?

Use Copy link to share the current inputs. The URL contains your entered numbers. Calculations run in your browser and do not require an account.

## Embedding

Embed: https://getoddsapi.com/embed/odds-calculator
Keep a visible attribution link to the canonical explanation. Embed pages are noindex; use the canonical page for indexing and citations.

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- [Same game parlay calculator](https://getoddsapi.com/same-game-parlay-calculator)

Independent educational product, not affiliated with any sportsbook or pick’em operator. Results are arithmetic, not predictions or betting advice. Only participate where lawful and within limits you can afford.
Responsible gambling resources: https://www.ncpgambling.org/