🧮 Beat the Clock
60 seconds. How many rapid engineering size estimates can you get within range? Real rule-of-thumb formulas, real-time scoring — no faking it, no partial credit for being close on the timer.
You'll get random spans and story counts. Estimate the size, hit Enter or Check, and move fast — the clock doesn't stop.
These are standard, widely-taught preliminary sizing
rules-of-thumb (span-to-depth ratios, approximate building period) — useful for a first
guess, never a substitute for real calculation. Always verify with the appropriate
calculator before using any number for actual design.
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