Final price and effective discount when percentage discounts are stacked one after another, versus simply adding them.

Round a price to a charm ending such as .99 or .95, or to steps like 9 at the end of tens, up, down or nearest.

Total and average unit price for a quantity under graduated or volume tiers given as minQty:unitPrice pairs.

Pages from a word count at your words-per-page figure, rounded up, plus even page count and sheets for print.

Standard US trade book trim sizes in inches and mm, or look up one size like 6x9 and its closest standard.

Free-space path loss in dB from distance and frequency, plus wavelength; or the range that produces a given loss.

Link budget: received power, fade margin and maximum free-space range from TX power, antenna gains, losses and sensitivity.

Spell a callsign, code or name with the ICAO/NATO phonetic alphabet, digits included, flagging unspellable symbols.

SWR, reflection coefficient, return loss, mismatch loss and reflected power from SWR, a resistive load, or two power readings.

Fresnel zone radius for a radio path from distance and frequency, with the 60% clearance needed for a clear link.

Print book spine width in inches and mm from page count and paper type (white, cream, color) or your own thickness.

Silent reading time for a word count at your words-per-minute (default 238), as minutes and hours:minutes:seconds.

Print book royalty per copy from list price, printing cost and royalty rate, plus break-even price and total.

Wavelength and half-wave dipole, quarter-wave vertical and full-wave loop lengths for a frequency, with velocity factor.

Exact difference between two dates as years, months and days, plus total days, weeks and whole months.

Add business days to a date or count the business days between two dates, Monday-Friday, skipping holidays you list.

Exact age in years, months and days from a birth date as of a date, plus next birthday and days until it.

Convert latitude/longitude to a Maidenhead grid locator (4, 6 or 8 characters) or a locator to its centre and bounds.

Encode text to International Morse or decode dots and dashes, with duration at your words-per-minute (PARIS standard).

Convert power between dBm, dBW, mW and W, and the RMS and peak voltage across 50 ohms (or your impedance).