Casio fx-115ES Plus Online Calculator

Keys, modes and editing

MODE opens COMP, CMPLX, STAT, BASE-N, EQN, MATRIX, TABLE, VECTOR, INEQ, VERIF and DIST. SHIFT MODE opens setup; RCL recalls a variable and SHIFT RCL stores the current result. SHIFT 4 opens matrix operations, SHIFT 5 vector operations, and SHIFT 1 statistics and distributions.

SHIFT uses the gold label above a key; ALPHA uses the pink label. Select degrees, radians or grads in setup. The negative key starts a negative number; subtraction continues a calculation from Ans. S⇔D switches a recognized exact fraction or radical to decimal. ENG changes engineering notation.

Click the calculator to type numbers and operators. Enter calculates, Escape clears, and arrows edit or navigate. DEL deletes at the cursor; Backspace deletes before it. Up recalls history on the calculation screen. The Expression field accepts named functions; labeled form fields can be edited directly or with calculator keys. Extra web controls make the supported functions easier to reach.

Equations, calculus and tables

EQN solves quadratic and cubic equations and systems with two or three unknowns. INEQ solves quadratic and cubic inequalities; VERIF compares two real expressions. SOLVE finds a numerical root near a guess. Derivatives, definite integrals, finite sums and products are available through numerical tools. Enter coefficients or bounds in the labeled fields, then calculate.

TABLE evaluates one or two functions over inclusive start, end and step values. The fx-115ES Plus table is limited to 30 rows for one function or 20 rows for two. Invalid ranges and undefined values produce an error. The table uses the same angle setting as calculations.

Statistics and scientific modes

Statistics supports one-variable summaries, paired data and regression. Enter comma-separated real data, optional integer frequencies and a prediction value. The implemented distributions include normal, binomial and Poisson functions. Complex mode supports i, magnitude, argument and conjugate; Base-N offers signed 32-bit DEC, HEX, BIN and OCT arithmetic and logical functions.

Matrices support MatA, MatB and MatC, up to 3×3, with determinant, inverse and transpose. Vectors have two or three components and support dot product, cross product, magnitude and angle. The latest matrix/vector result can be recalled. Singular matrices and incompatible dimensions return an error.

Textbook output recognizes selected fractions, simple radicals and multiples of π numerically. It is not a computer algebra system. Scientific constants and conversions are a selected reference set using the site’s current values, rather than every entry or historical constant on the handheld.

Worked examples and sharing

Follow mode highlights the next physical key. Watch mode lets you explore; Play step animates one instruction and stops. Show me completes one instruction immediately. Pause, Back, Restart and Return to example help you revisit each result. Copy link shares the calculation or current example position.

Long inputs, replay payloads and numerical searches are bounded so a malformed calculation cannot monopolize the page. Random calculations replay from a deterministic seed. This page follows the second-edition scientific key layout. Adapted form and menu navigation is designed for browser learning. Consult Casio’s manual for the complete physical calculator.