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Links: HP Plus RPN/RPL Graphing Calculator Comparison Table (PDF)HP Plus RPN/RPL Graphing Calculator Comparison Table (Excel)
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Display and KeyboardHP-28CHP-28SHP-48SX/SHP-48GX/G/G+HP 49GHP 49g+HP 48gIIHP 50gHP Prime
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Display typeLCDLCDLCDLCDLCDLCDLCDLCDColor Touch LCD
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Display format4 Lines (137×32)4 Lines (137×32)4+ Lines (131x64)4+ Lines (131x64)4+ Lines (131x64)9 Lines (131x80)4+ Lines (131x64)9 Lines (131x80)12 Lines (320x240)
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FIXed number formatYesYesYesYesYesYesYesYesYes
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SCIentific number formatYesYesYesYesYesYesYesYesYes
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ENGineering number formatYesYesYesYesYesYesYesYesYes
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STanDard / ALL number formatYesYesYesYesYesYesYesYesYes
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Alpha messages and promptsYesYesYesYesYesYesYesYesYes
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Softkeys labeled by mag. card or overlay---------
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Softkeys labeled by display menusYesYesYesYesYesYesYesYesYes
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Softkeys with neither labeling system---------
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Status annunciatorsYesYesYesYesYesYesYesYesYes
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Redefinable keyboard--YesYesYesYesYesYesYes
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Customizable User Menu---------
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# of digits displayed (internal precision)*12 (12)12 (12)12 (12)12 (12)12 (12)12 (12)12 (12)12 (12)12 (12)
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Exponent range (+/-)499499499499499499499499499
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LogicHP-28CHP-28SHP-48SX/SHP-48GX/G/G+HP 49GHP 49g+HP 48gIIHP 50gHP Prime
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Logic systemRPN/RPLRPN/RPLRPN/RPLRPN/RPLRPN/RPL/ALGRPN/RPL/ALGRPN/RPL/ALGRPN/RPL/ALGRPN/RPL/ALG
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Stack levelsUnlimUnlimUnlimUnlimUnlimUnlimUnlimUnlim1000
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Last xYesYesYesYesYesYesYesYesYes
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UndoYesYesYesYesYesYesYesYesYes
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PrecedenceYesYesYesYesYesYesYesYesYes
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ParenthesesYesYesYesYesYesYesYesYesYes
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Storage Addition (STO +)YesYesYesYesYesYesYesYes-
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Storage Arithmetic (STO +, −, ×, ÷)YesYesYesYesYesYesYesYes-
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Storage Exponentiation (STO ^)---------
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Recall Arithmetic---------
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Named variablesYesYesYesYesYesYesYesYesYes
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Multiple data typesYesYesYesYesYesYesYesYesYes
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Directories-YesYesYesYesYesYesYes-
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Traditional Enter key operation*NoNoNoNoNoNoNoNoNo
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MathHP-28CHP-28SHP-48SX/SHP-48GX/G/G+HP 49GHP 49g+HP 48gIIHP 50gHP Prime
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+, −, ×, ÷Yes Yes Yes Yes Yes Yes Yes Yes Yes 
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1/xYesYesYesYesYesYesYesYesYes
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√YesYesYesYesYesYesYesYesYes
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x2YesYesYesYesYesYesYesYesYes
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LOG xYesYesYesYesYesYesYesYesYes
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10xYesYesYesYesYesYesYesYesYes
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LN xYesYesYesYesYesYesYesYesYes
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exYesYesYesYesYesYesYesYesYes
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yxYesYesYesYesYesYesYesYesYes
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πYesYesYesYesYesYesYesYesYes
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%YesYesYesYesYesYesYesYesYes
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% changeYesYesYesYesYesYesYesYesYes
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INTeger truncation and ABSolute valueYesYesYesYesYesYesYesYesYes
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Trigonometric functions (SIN, COS etc.)YesYesYesYesYesYesYesYesYes
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Hyperbolic trig. (SINH, COSH etc.)YesYesYesYesYesYesYesYesYes
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# of trig. modes (degrees, radians, grads)223333333
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Advanced MathHP-28CHP-28SHP-48SX/SHP-48GX/G/G+HP 49GHP 49g+HP 48gIIHP 50gHP Prime
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Solver / root finderYesYesYesYesYesYesYesYesYes
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Numeric integrationYesYesYesYesYesYesYesYesYes
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Complex numbersYesYesYesYesYesYesYesYesYes
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Matrix operationsYesYesYesYesYesYesYesYesYes
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Matrix writer--YesYesYesYesYesYesYes
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Equation writer--YesYesYesYesYesYesYes
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Symbolic operations (CAS)YesYesYesYesYesYesYesYesYes*
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Fractions--Yes*Yes*YesYesYesYesYes
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Plotting and graphics (display)YesYesYesYesYesYesYesYesYes
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Plotting and graphics (printer / plotter)OptionOptionOptionOptionOptionOptionOptionOption-
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Equation List--YesYesYesYesYesYes-
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Long exact number support----YesYesYesYesYes
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StatisticalHP-28CHP-28SHP-48SX/SHP-48GX/G/G+HP 49GHP 49g+HP 48gIIHP 50gHP Prime
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Mean, standard deviation (# of variables)MultipleMultipleMultipleMultipleMultipleMultipleMultipleMultipleMultiple
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Σ of n, x, x2---------
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Σ of n, x, x2, y---------
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Σ of n, x, x2, y, xy---------
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Σ of n, x, x2, y, y2, xy---------
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Σ of listsYesYesYesYesYesYesYesYesYes
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Random number generatorYesYesYesYesYesYesYesYesYes
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Linear regression, estimateYesYesYesYesYesYesYesYesYes
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Curve fitting--YesYesYesYesYesYesYes
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Correlation coefficientYesYesYesYesYesYesYesYesYes
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Normal distributionYesYesYesYesYesYesYesYesYes
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FactorialYesYesYesYesYesYesYesYesYes
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GammaYesYesYesYesYesYesYesYesYes
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Combinations and permutationsYesYesYesYesYesYesYesYesYes
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Scientific and TimeHP-28CHP-28SHP-48SX/SHP-48GX/G/G+HP 49GHP 49g+HP 48gIIHP 50gHP Prime
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Polar / rectangular conversionsYesYesYesYesYesYesYesYesYes
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Base conversions (2, 8, 10, 16)YesYesYesYesYesYesYesYesYes
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Arithmetic in bases 2, 8 and 16YesYesYesYesYesYesYesYesYes
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Bit operations (AND, OR, XOR, ...)YesYesYesYesYesYesYesYesYes
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Selectable word size (1-64 bits)YesYesYesYesYesYesYesYesYes
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Selectable complement mode---------
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Decimal hrs / hrs.min.sec. conversionsYesYesYesYesYesYesYesYesYes
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Hrs.min.sec arithmeticYesYesYesYesYesYesYesYesYes
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Time of day clock--YesYesYesYesYesYesYes
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Timer--YesYesYesYesYesYes-
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Dynamic calculations (timer × rate)---------
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Alarms--YesYesYesYesYesYes-
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Unit ConversionsHP-28CHP-28SHP-48SX/SHP-48GX/G/G+HP 49GHP 49g+HP 48gIIHP 50gHP Prime
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Centimeters / inchesYesYesYesYesYesYesYesYesYes
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Millimeters / inchesYesYesYesYesYesYesYesYesYes
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Meters / feetYesYesYesYesYesYesYesYesYes