For publishers & content creators
Add real calculators to your content
Market Math calculators are free to embed on any website. Give your readers interactive tools instead of static tables — they stay longer and come back more.
Zero cost
Every calculator is free to embed. No API keys, no signup, no rate limits.
Auto-resizing
Embeds resize to fit their content automatically. No fixed heights, no scrollbars.
One snippet
Copy-paste a single code block. No dependencies, no build tools, works on any site.
Mobile-ready
Fully responsive. Works on phones, tablets, and desktops out of the box.
How it works
Pick a calculator from the list below
Click "Get Embed Code" to see the snippet
Paste it into your HTML — the calculator loads instantly
Available calculators
Sports Betting
De-Vig Calculator
Remove vig from bookmaker odds — 7 methods compared side-by-side
EV Calculator
Find +EV bets by comparing rec book odds against sharp lines
Odds Converter
Convert between American, Decimal, Fractional and Implied Probability
Kelly Criterion
Calculate optimal bet size based on your edge, odds, and bankroll
Parlay Calculator
Find the true fair odds of your parlay and see the hidden vig
Hold Calculator
See how much vig the sportsbook is charging on any market
What's My Edge?
Test if your betting record shows real skill or just luck
Prediction Markets
Market Converter
Convert between sportsbook odds and prediction market prices
Fee Calculator
See how Polymarket and Kalshi fees affect your EV
Break-Even
See how often you need to win after platform fees
PM EV Calculator
Expected value and Kelly sizing for prediction market contracts
Multi-Outcome
Find mispriced outcomes in multi-outcome markets
Liquidity
Simulate order book slippage before placing large orders
Position Risk
See how correlated positions amplify your portfolio risk
Cross-Platform
Arb Calculator
Find cross-platform arbs and see if they survive fees
BR Turnover
See why turning over your bankroll crushes buy & hold