WhichDist for Excel

WhichDist for Excel answers a common question for engineers and students: which probability distribution fits my data? Select a numeric range in Excel and run a guided input analysis workflow — without exporting to Arena Input Analyzer, Minitab, or another app.

WhichDist fits candidate probability distributions (Normal, Exponential, Weibull, Lognormal, Gamma, and more), estimates parameters with MLE / MoM, and ranks them with an AICc-led composite that always shows Anderson–Darling and Kolmogorov–Smirnov goodness-of-fit. Proof plots include histogram + PDF, ECDF, and Q–Q.

Built for reliability, process, quality, simulation, and academic lab work. Free analysis runs entirely offline — sample data never leaves Excel. Results write back to a WhichDist_Results sheet.

Free

• Core + Free major-pack distributions (reliability / Weibull, hydrology, telecom, process, quality, OR/simulation)
• Distribution fitting with AICc, AD, KS, and χ²; comparison dashboard; Distribution DNA
• Sample library, short lab report, Excel + JSON export — no account required

Pro (optional paid upgrade via Stripe)

Pro is an optional subscription purchased through Stripe (not through Microsoft): $0.99/month or $9.48/year (~$0.79/mo). Students and instructors can get 50% off with a verified academic email.

• Advanced distributions (Inverse Gaussian, Weibull-3, Pearson III, Log-Pearson III, Rice, Hypergeometric, Truncated Exponential, mixtures)
• Exports: Python (scipy), R, Arena, Simio, AnyLogic
• Monte Carlo sample generation and the full lab report

Website: https://whichdist.com · Support: https://whichdist.com/contact.html