# qalc > Powerful and easy to use command-line calculator. > See also: `bc`. > More information: . - Launch in interactive mode: `qalc {{[-i|--interactive]}}` - Launch in terse mode (print the results only): `qalc {{[-t|--terse]}}` - Update currency exchange rates: `qalc {{[-e|--exrates]}}` - Perform calculations non-interactively: `qalc {{66+99|2^4|6 feet to cm|1 bitcoin to USD|20 kmph to mph|...}}` - List all supported functions/prefixes/units/variables: `qalc --{{list-functions|list-prefixes|list-units|list-variables}}` - Execute commands from a file: `qalc {{[-f|--file]}} {{path/to/file}}`