Air velocity (FPM) and velocity pressure (in. wg) in a round or rectangular duct from CFM, or the CFM at a velocity.

Convert EER, COP and kW per ton, and tons, BTU/h and kW of cooling capacity.

Fan affinity laws: new airflow, pressure and power after a speed change (flow ~ N, pressure ~ N^2, power ~ N^3).

Convert an airport code between IATA (3 letters) and ICAO (4 letters) and validate the format; reports unknown codes.

Nearest airports to a latitude and longitude with distance, bearing, type and codes; filter by size or scheduled service.

Time zone offset of an airport: reports whether the dataset has one (it does not) and gives a nominal solar offset.

Runway facts for an airport by IATA, ICAO or name: longest runway, surface, lighting, headings, closed runways.

Great-circle distance in km, miles and nautical miles between two airports, with a rough flight time estimate.

Similarity of two texts by edit distance, word overlap (Jaccard) and cosine, with a same, similar or different verdict.

Word-level diff of two texts: words added, removed and kept, the changed spans, and a percent changed.

Guess whether text is English, Spanish, French, German, Italian, Portuguese, Dutch or Swedish, with a confidence margin.

Top keywords and two-word phrases in an English text by frequency after removing stopwords, with counts and share.

Convert text to camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, sentence case and a URL slug.

Sensible heat from airflow and temperature difference (1.08 x CFM x dT), or the CFM needed for a heat load.

Readability of English text by Flesch ease, Flesch-Kincaid, Gunning fog, SMOG, Coleman-Liau and ARI, with a consensus grade.

Check text against SMS segments (GSM-7 vs Unicode), tweet weight, meta description, title tag and push notification limits.

Find an airport by IATA code, ICAO code or name with fuzzy matching: location, elevation, type, longest runway.

List airports in a country or ISO region (like US-CO) filtered by size and scheduled service, with codes.

Busiest large airports ranked by annual passengers (latest Wikidata figure), optionally by country or continent.

Gradient percent and angle from rise and distance, plus climbing rate (VAM) and the time to climb at a given rate.