MB-88F Fractional Calculator

MB 88F is a calculator that works the way a shop does — in exact fractions. Every value is stored as a whole-number numerator over a whole-number denominator, so the math never drifts. 1/3 + 1/6 is exactly 1/2, never 0.4999. Inches and millimeters relate by the exact definition 1 in = 25.4 mm, so conversions never lose a thousandth. It uses Reverse Polish Notation (RPN): no equals key, no nested parentheses, just a clean four-register stack that mirrors how you actually work a problem. BUILT FOR THE SHOP • Exact fraction arithmetic — add, subtract, multiply, divide, always reduced to lowest terms • Mixed-number entry: key 2 SPC 1 b/c 2 for 2 1/2 • Tape-measure rounding to 1/8, 1/16, 1/32, or 1/64 — and TRU to restore the exact value • Fraction ↔ decimal conversion both ways • Exact unit tagging and conversion: inches, feet, millimeters, meters • Feet read as feet plus fractional inches (22.5 ft → 22 ft 6 in) POWER KEYS • 1/x, x², and √x for diagonals and squaring-up a frame • ½x to instantly find a centerline, 2x to double it • Store/recall memory (STO/RCL) to hold and reuse a value • Last-X recall, stack roll, and swap MADE TO LIVE ON YOUR BENCH • 11 color themes • Optional thousands separator and fixed decimal places • Built-in user manual, key index, and cheat sheet • Works 100% offline. No account, no ads, no tracking, no data collected — ever. Try it free for 2 days, then unlock the full app forever with a single one-time purchase — no subscription. Whether you