About JetLag Planner

JetLag Planner provides free tools for travelers: a flight time estimator, time zone converter, and jet lag adjustment planner. Our goal is to give you quick, honest answers without clutter.

Flight time estimates are calculated from great-circle distance using the Haversine formula, with cruise speed heuristics for different route distances. Time zone calculations use IANA timezone data with full DST awareness. Jet lag plans follow evidence-aligned heuristics based on published circadian rhythm research.

All tools are free to use with no sign-up required. We support ourselves through non-intrusive advertising.

What we are not: We are not a travel booking service, airline, or medical provider. Our estimates are approximate and our jet lag guidance is general wellness information — not medical advice. See our full disclaimer.