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Utility guides

Short reference guides that explain formulas, assumptions, and terminology behind the working tools.

Understand percentage-of, percentage increase, decrease, and difference with formulas and examples.

Learn how principal, rate, compounding frequency, contributions, and time affect future value.

Understand fixed-payment loan estimates, principal, interest, term, and payoff time.

A practical guide to common metric and US/imperial length, mass, area, volume, and speed conversions.

Understand calendar days, weekdays, calendar months, years, and time durations.

Understand rental yield, cap rate, cash flow, cash-on-cash return, DSCR, vacancy, and GRM.

Use area, volume, coverage, waste allowances, and product dimensions for early material estimates.

Understand word counts, character counts, reading-time estimates, speaking time, and text metrics.