Standard
Standard
Percent
Markup
Tax
Tip
Fraction
Sq Ft
Cubic Yds
Lumber
Convert
0
Enter fractions as whole space numerator/denominator.
Examples: 2 1/2, 3/4, 5
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Result (mixed fraction)
Calculate cubic yards/feet/meters for concrete, gravel, mulch, etc.
Enter length, width, depth — pick units.
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Cubic Yards
Enter cost and markup %. Shows sale price and profit.
Or enter sale price + cost to back-calculate markup %.
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Sale Price
Enter subtotal and tax %. Shows total and tax amount.
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Total (with tax)
Enter bill amount and tip %. Optionally split between people.
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Total per person
Calculate floor/wall/ceiling area. Useful for flooring, paint coverage, tile.
Add multiple rooms with the + button.
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Total Square Feet
Calculate board feet: (T × W × L) / 12 with T & W in inches, L in feet.
Add multiple boards with the + button.
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Total Board Feet
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📖 ABOUT
PRO CALC — a contractor's calculator.

Modes:
• Standard — basic math (+ − × ÷, √, %)
• Percent — shows what 10% IS and what after-10% would be
• Markup / Tax / Tip — pricing & receipts
• Fraction — for tape-measure math (2½ + ¾, etc)
• Sq Ft / Cubic Yds / Lumber — multi-room area, volume, board feet
• Convert — length, weight, temp, volume, area, currency

Long-press any key with a small label in the top-right for the advanced function:
• C → AC (clear everything incl. ANS)
• √ → xⁿ (power: enter base, long-press √, enter exp, =)
• x² → x³ (cube)
• ± → π (pi)
• % → 1/x (reciprocal)
• ⌫ → AC (clear all)
• ANS → log (base-10 logarithm)

ANS recalls your last result — useful for chaining calculations.