Free tools
Chess calculators that just work
15 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.
FIDE rating calculator
Estimate FIDE rating change and expected score at 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 and board editor
Board editor plus PGN viewer: build positions, validate FEN field by field, share by link.
Open toolAcademy break-even calculator
Sum every batch, add a launch cost, see combined margin and months to break even.
Open toolChess pairing generator
Rank your players, get round 1 top-half-vs-bottom-half pairings in the browser. Nothing is uploaded.
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 toolChess certificate generator
Paste a name list, pick an award type, print A4 chess certificates in the browser. Nothing is uploaded.
Open toolChess rating converter
Convert FIDE, Lichess, Chess.com, and USCF ratings into a dated estimate range.
Open toolChess class schedule maker
Turn your batches, coaches, days, and times into a clean weekly schedule.
Open toolChess progress report builder
Create a clear parent-facing progress report from a structured five-part outline.
Open toolChess rating tracker
Log dated ratings and see the current rating, total change, best jump, and trend.
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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