About Teacher's Bet
A calculator that shows its work. That is the whole pitch.
What it does
It takes a price off a board and tells you what that price is actually worth.
Paste a two-sided line and it strips out the bookmaker's cut, which leaves the fair probability. Compare that to what you were offered and there is your expected value. Give it a bankroll and it sizes the bet. Give it two books and it finds the arbitrage. Give it a Kalshi contract and it charges you the fee twice, going in and coming back out, because that is what actually happens to you.
All of these are open right now, free:
- No-vig calculator: the fair price hiding behind a line
- Expected value calculator: on your own numbers
- Kelly calculator: how much to actually put on it
- Arbitrage calculator: whether two prices cross, and how to split the stake
- Closing line value calculator: your price against the close, graded A to F
- Kalshi fee calculator: the fee, and where it moves your break-even
Every answer opens into the arithmetic that made it: which method ran, every number in between, and a timestamp on each input. That is the product. Not "trust us." Check us.
What it does not do
No wagers, no money held, no bets placed. It is a calculator, not a book and not a broker.
No picks and no advice. Nothing on this site says "bet this." What you do with a number is yours.
No guarantees, because nobody can honestly make one. When your inputs contain no edge, the number printed is $0, never rounded up into something that looks like an opportunity.
No testimonials, no star ratings, no user counts, because none of them would be real. And no sportsbook pays to be listed here.
Who runs it
Teacher's Bet is owned and operated by Escapement Technologies LLC, a New York company in Syracuse, New York. Teacher's Bet is the name on the door; Escapement is the name on the paperwork. So the terms say Escapement, and if you subscribe, so does the line on your card statement.
It was founded by Alex Thornton, and every page ships under a named byline. There is no anonymous team of experts and no invented review board; accountability for every number sits with a named author. By training he is an engineer: an MS in electrical engineering from Columbia, then seven years in industry. That is not a betting credential, and the site does not dress it up as one. It is where the habit comes from. Engineers are taught to distrust any number they cannot reproduce, which is why every result on this site opens into the arithmetic that produced it, why the math library is published under an MIT licence so you can check it against your own, and why the board would rather print a refusal than a figure it cannot support.
Every article carries a byline and a last-reviewed date, and that date comes from the page's own structured data, so the two cannot quietly drift apart. Found a wrong number? Tell us: support@escapementtech.com. The standing policy is on the contact page.
Is it free?
The math is free and stays free. Every calculator, the whole Learn course, the formula sheet. No account, no email, no card, and it is not a trial that runs out.
Extra Credit buys the board without the two-hour delay, and alerts pushed to your phone. It does not buy a formula the free tier lacks, and it never buys a pick. It is $39 a month or $299 a year, and pricing is one page, cancel path included.
Where the math comes from
It is published, not proprietary. The odds conversions, all three de-vig methods, Kelly sizing and the arbitrage split live in teachersbettextbook, MIT-licensed, on PyPI. Install it and reproduce every calculator number on this site without asking me. That is the point of putting it out there.
One exception. The pooled fair line's consensus code is not in the package, and the fitted per-venue weights will not be either once they exist. The weighting formula and its constants are printed in full on the methodology page, and the result is always shown: the fair price, how many venues qualified, how far apart they were.
Where the odds come from
Licensed first-party APIs only. Kalshi for prediction markets, a commercial odds API for sportsbook lines. Nothing is scraped and no resold feed is bought. Every quote carries two timestamps, when we pulled it and when the venue last moved it, and a stale price is labelled stale.
Is this the Boy Meets World episode?
No. Different thing entirely, and also not the Ruby Steele novel.
The name is possessive: the teacher's bet. Not a site for teachers. A teacher works the problem on the board where everyone can watch each step, which is the only feature this site really has.
The standing rules
- Never say "bet this." Every output is a calculation and reads like one.
- Every number carries two timestamps: when we computed it, and when the venue last moved the price.
- Every result can show its work. If it cannot be derived step by step, it does not ship.
- The honest zero. No edge in, $0 out.
- Refuse to print a number we cannot support. Every fair line ships with its venue count and an agreement label, and we cut the confidence rather than dress the number up. This one is not finished: a single-venue market still publishes today, with its count shown as 1. A hard refusal below two venues is the next change. The methodology page tracks what actually runs.
Those are product rules, not marketing, which is why the one that is only half built says so instead of being quietly claimed. They are also why the editorial policy and the responsible gambling page exist.
Frequently asked questions
What is Teacher’s Bet?
Teacher’s Bet is a sports-betting analytics calculator at teachersbet.com. It works out fair prices, expected value, Kelly stakes, arbitrage and Kalshi fees, and shows the arithmetic behind every number. It is not a sportsbook: it takes no wagers, holds no funds and places no bets.
What does Teacher’s Bet not do?
No wagers, no money held, no bets placed. No picks and no advice: nothing on the site says “bet this.” No guarantees either, so when your inputs contain no edge the number printed is $0. There are no testimonials, ratings or user counts anywhere, and no sportsbook pays for placement.
Who runs Teacher’s Bet?
Teacher’s Bet is owned and operated by Escapement Technologies LLC, a New York company in Syracuse, New York, founded by Alex Thornton. Teacher’s Bet is the name on the door, Escapement is the name on the paperwork and on your card statement. Email support@escapementtech.com and it reaches the company directly.
Is Teacher’s Bet free?
The math is free and stays free. Every calculator and the whole Learn course are free, with no account, no email and no card, and the free tier is not a trial. Extra Credit is $39 a month or $299 a year, and it buys speed and stored history, never a formula the free tier lacks.
Where does the math come from?
It is published, not proprietary. The odds conversions, three de-vig methods, Kelly sizing, arbitrage split and Kalshi fee schedule are all in teachersbettextbook, MIT-licensed on PyPI, so anyone can reproduce those numbers. The pooled fair line is the exception, though its weighting formula and constants are printed on the methodology page.
Is Teacher’s Bet the Boy Meets World episode?
No. Teacher’s Bet is a sports-betting analytics tool. It is not the 1993 Boy Meets World episode of the same name, nor the novel by Ruby Steele.