Free tools
Chess calculators that just work
Six free tools for players, parents, coaches, and academy owners. Every formula is documented and sourced, everything runs in your browser, and nothing asks for an email.
Elo rating calculator
Expected score and exact rating change for any result, at FIDE K = 40, 20, or 10.
Open toolPerformance rating calculator
What rating did you play like this event? Average opposition + 800 x score% - 400.
Open toolAcademy batch calculator
Revenue, margin, and break-even students per batch, in ₹ or $.
Open toolTime control converter
Classical, rapid, or blitz? FIDE category plus real wall-clock estimates.
Open toolSwiss rounds calculator
Minimum rounds by player count, prize-fair recommendations, boards per round.
Open toolFEN viewer
Paste any FEN and see the position instantly. Runs entirely in your browser.
Open toolRating change estimator
Expected score plus the exact point swing at K = 40, 20, and 10, side by side.
Open toolAcademy break-even calculator
Sum every batch, add a launch cost, see combined margin and months to break even.
Open toolSwiss pairing table generator
Rank your players, get round 1 top-half-vs-bottom-half pairings with byes handled.
Open toolTournament time planner
Time control, average moves, and rounds in, total event duration out.
Open toolPrize fund splitter
Total fund and place percentages in, exact whole-unit amounts that always add up.
Open toolBuilt by the team behind ChessCore, the academy management platform. The math is open: each tool page documents its formula and cites its sources, so you can check our work.
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