Odds Converter is a small suite of betting tools. The main page
converts between the four standard odds formats: American
(moneyline), Decimal (European), Fractional (UK), and Implied
Probability. Specialist pages handle horse racing, Dutching
across multiple selections, and prediction markets like
Polymarket and Kalshi. Every calculation runs in the browser as
you type, with the underlying formulas published openly on the
site.
The site does not take wagers. It is not a sportsbook, not a
broker, and not affiliated with any specific sportsbook or
prediction market. It exists to make the math behind a bet easy
to see and easy to check.
Odds Converter is owned and operated by Search Ventures
Ltd, a private limited company registered in the United
Kingdom. Search Ventures Ltd is the sole legal entity behind
this website. All editorial, technical, and commercial decisions
sit with the company; there are no third-party publishers, white
labels, or content syndication partners.
The site does not currently carry advertising or paid affiliate
placements. If that changes in the future, paid placements will
be clearly labelled and editorial content will remain
independent of any commercial relationship.
Odds Converter is built and maintained by Matt
Hodson, a software engineer based in the United Kingdom.
Matt builds consumer web applications and data tools, and runs
Odds Converter as the publisher and sole developer. He is
responsible for the calculators, the prose, the underlying
math, and the production stack.
Matt selected the formulas on this site by cross-referencing
them against published sources in sports betting, derivatives
pricing, and probability. Every calculation on the site is open
code that you can read, copy into Excel, or replicate by hand.
If something looks wrong, the corrections process is in the
next section.
Accuracy
The four conversion formulas (American to Decimal, Decimal to
American, Fractional to Decimal, Decimal to Implied) are
deterministic. They produce the same answer in any reasonable
implementation. The site shows the formulas in the Reference
section of the main converter and provides them as plain Excel
cell formulas on the Excel page. The same formulas run in
JavaScript in the browser. If a calculator output ever
disagrees with the published formula or with a hand
calculation, that is a bug and we want to know.
Transparency
There is no hidden math. The conversion chart on the main page
lists 28 common lines in all four formats; the formula
reference shows the underlying equations; the FAQ on each page
explains the reasoning. Every claim about market behaviour
(sportsbook vig, prediction market spreads, pari-mutuel
breakage) is stated as a generalisation, not a guarantee, and
is something you can verify against any major sportsbook or
exchange.
Independence
The site has no commercial relationships with sportsbooks,
exchanges, or prediction markets. It does not currently take
affiliate revenue. Editorial decisions about what tools to
build, what formulas to feature, and what venues to mention
are made on usefulness alone.
Corrections
If you find an error in a calculation, a formula, or an
explanation, please report it through the
contact page.
Verified corrections are applied as soon as possible and noted
on the affected page.
Not financial or gambling advice
Odds Converter is an informational tool. Nothing on this site
is a recommendation to place a bet, a prediction of any
specific outcome, or financial advice. Gambling carries a real
risk of loss; only stake what you can afford to lose, and use
the responsible gambling resources offered by your local
regulator and operator if betting becomes a problem.
For corrections, questions, partnership enquiries or anything
else, use the contact
form. Messages go directly to the team behind the site.