Formula Sheets

Printable one-pagers of the key formulas behind each calculator — dense, scannable, ready for your desk.

All Finance Fitness Math Other Personal Finance Time Units
Math

Percentage Triad

Three rearrangements of part, whole, and rate — plus percent change for growth and decline.

Open sheet → Math

Quadratic Formula

Standard form, discriminant cases, and the ± quadratic formula for ax² + bx + c = 0.

Open sheet → Math

Slope Between Two Points

Rise over run, undefined vertical lines, and the point-slope line through a known point.

Open sheet →