Interactive Basic Chain Ladder, Bornhuetter–Ferguson, Inflation-Adjusted CL & Average Cost per Claim
Edit any cell in the known (white) triangle directly — the projection updates future (amber) cells when you click Project.
Cumulative claims triangle
Quiz mode generates a fresh random triangle. Work out the outstanding reserve for each accident year by hand (or with a calculator), enter your figures, then check your answer against the model's calculation.
Triangle (known claims only)
Your reserve estimates
Leaderboard — best streak