Growing degree days from daily lows and highs with a base temperature and upper cutoff: daily and cumulative totals.

Bracelet or anklet length from wrist or ankle circumference and fit (snug, standard, comfortable, loose), with clasp allowance.

Estimate a diamond's carats from millimetre size and shape, or the diameter of a round stone for a given carat weight.

Gold karat to fineness and percent, and the alloy to add to fine gold to reach a target karat, or the karat of a mix.

Melt value of gold, silver or platinum jewelry from weight, karat or fineness and the spot price per troy ounce you supply.

Convert a ring size between US, EU (ISO circumference), UK letter, inside diameter and circumference in mm and inches.

Name a necklace length (choker, princess, matinee, opera, rope) and where it sits, or suggest a length from neck size.

Exact age from a birth date: years, months, days, total days, weeks and hours, birth weekday and days to the next birthday.

Days between two dates (signed), as weeks plus days and years/months/days, with Monday-to-Friday days counted.

Traditional birthstone, alternates and birth flowers for a month number or birth date, plus a wedding-anniversary gift table.

Overall class grade from categories or assignments with scores, maximums and weights, normalizing weights that do not total 100.

Casting weight in grams, pennyweight and troy ounces from volume or wax model weight, for gold, silver, platinum and more.

Number of beads for a strand of a given finished length from bead size and spacing, with finished length and total weight.

Next birthday on or after a date: its date, weekday, days to go and the age being turned, with the leap-day rule.

Dates of round-number days alive (1,000, 5,000, 10,000, 25,000 and your own), with weekday and age on that day.

Generation label (Silent, Boomer, Gen X, Millennial, Gen Z, Alpha) for a birth year using Pew Research cut-offs.

Weekly study hours from credit hours using the 2 to 3 hours per credit rule, with total weekly workload and a daily plan.

Machining time for a cut length from a table feed, or from rpm and feed per revolution, with passes.

Check whether a prompt fits a context window with output reserve, and how many more chat turns fit.

Prompt-cache savings for a shared prefix: cost with and without caching, break-even requests and percent saved.