FREE TOOLS
Free tools that show the math.
Calculators and converters for the money questions doddo covers. Each one shows its formula, labels estimates as estimates and links to the official sources.
Banks
Reads your fileBank statement converter
Convert a PDF bank statement to Excel or CSV. Upload the file you downloaded, with no bank login. Free, no account, and your file is not kept.
Runs in your browserHigh-yield savings account calculator
High-yield savings account calculator: see interest and ending balance from your APY, then compare a bank bonus with leaving the same money in savings.
Runs in your browserCredit card points value calculator
How much are Chase, Amex or Capital One points worth? See a plain redemption value next to an optimistic travel scenario, with the sources and review date.
Runs in your browserChase 5/24 calculator
Count the cards that fall under the Chase 5/24 rule today and see the date you drop below five. 5/24 is unofficial, based on reported data points.
Bonus conversion
Runs in your browserFree bet calculator
Free bet calculator for one sportsbook bonus bet: enter the bonus amount and both decimal odds to see the cash hedge stake and what you keep either way.
Runs in your browserBonus value calculator
Estimate what a sportsbook bonus bet, deposit match, bet-and-get or profit boost is worth, with the cash you commit and your costs kept separate.
Runs in your browserHedge calculator
Free hedge calculator for a cash bet, bonus bet or the last leg of a parlay. See the hedge stake, both results and how a cash-out offer compares.
Runs in your browserOdds converter
Free odds converter for American, decimal and fractional odds, implied probability and Kalshi or Polymarket prices in cents, plus the vig and no-vig odds.
Prediction markets
Runs in your browserKalshi fee calculator
Kalshi fee calculator for taker and maker orders, plus Polymarket US and Robinhood: see the fee, total cost, payout if right and break-even probability.
Runs in your browserPolymarket calculator
Free Polymarket calculator for Polymarket US: enter a price and contracts to see the fee, total cost, payout, profit if right and break-even probability.
Everyday money
Reads your filePDF to Excel converter
Turn the tables in any PDF, scan or photo, such as invoices, reports and price lists, into an Excel workbook or CSV. Free, no account, never stored.
Runs in your browserSplit the bill calculator
Free bill splitter that shares tax and tip by what each person ordered. Add the items, pick who shared them and copy who owes what, to the cent.
Runs in your browserWhat money might you be owed?
Answer a few quick questions to see which open claims, bank bonuses and sign-up offers might fit you, with an estimated range. Free, and nothing is saved.
What stays private
Calculators run in your browser, so the numbers you type are never sent or saved. Tools that read a file, such as PDF to Excel, say so on the page and never keep the file.
Estimates, not promises
Results use only the numbers you enter. They do not check live prices, limits, eligibility or account terms, and bonus bets and trading credits are not cash.
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