Absolute Change Calculator
Calculate the absolute change, relative change, and percentage change between two values. Compare increase vs decrease with visual change bars and a multi-scenario comparison table.
Free Arithmetic Calculators
98 toolsAddition, multiplication, rounding, base conversion, and number operation calculators. Browse our free arithmetic tools below — no sign-up required.
Absolute Value Arithmetic Calculator
Compute absolute values, distances between numbers, solve absolute value equations and inequalities, explore properties with a number line visual, batch mode, and comprehensive reference table.
Adding and Subtracting Fractions Calculator
Add or subtract two fractions with different denominators. See the LCD, step-by-step simplification, mixed number form, and decimal equivalent with a common-denominators reference table.
Adding Fractions Calculator
Add 2 to 5 fractions with any denominators. See the common denominator, step-by-step simplification, result as fraction, mixed number, and decimal. Visual fraction bars show each fraction and the sum.
Addition Calculator
Add multiple numbers with a step-by-step carry method, running total, digit-by-digit breakdown, place value table, and a number line visualization. Includes a practice mode with random problems.
Average Calculator
Calculate the arithmetic mean, median, mode, range, geometric mean, harmonic mean, RMS, standard deviation, and more from any list of numbers. Supports weighted averages, distribution visualization...
Average Percentage Calculator
Calculate the simple and weighted average of multiple percentages. See why simple vs weighted averages differ, with a weight contribution table and visual weight bars.
Binary Addition Calculator
Add two binary numbers with step-by-step carry method. View results in binary, decimal, hexadecimal, and octal. Includes bit-by-bit breakdown table, overflow detection, and visual carry chain.
Binary Division Calculator
Divide binary numbers with long division steps. View quotient and remainder in binary, decimal, hex, and octal. Includes step-by-step division table and precision control for fractional results.
Binary Fraction Calculator
Convert fractions to binary representation and vice versa. Analyze repeating patterns, precision loss, and IEEE 754 floating-point representation. Includes conversion steps table and visual bit pat...
Binary Multiplication Calculator
Multiply binary numbers using the partial products method with step-by-step visualization. View results in binary, decimal, hex, and octal. Includes partial products table and Booth's algorithm co..
Binary Operations Calculator
Perform bitwise AND, OR, XOR, NOT, and shift operations on integers. View step-by-step bit-by-bit computation, truth tables, binary/hex/octal representations, presets, and a bit visualization.
Binary Subtraction Calculator
Subtract binary numbers using the borrow method and two's complement. Compare both methods side-by-side with results in binary, decimal, hex, and octal. Includes borrow chain visualization and..
Ceiling Function Calculator
Compute ⌈x⌉ (ceiling), ⌊x⌋ (floor), round, and trunc for any number. Compare all rounding modes, see fractional part, step function visualization, ceiling division, and a full comparison table.
Decimal Calculator
Analyze a decimal or perform decimal arithmetic. Convert decimals to fractions, percents, and scientific notation, inspect place value, and review rounding targets in one tool.
Decimal to Binary Calculator
Convert decimal integers to binary, octal, and hexadecimal. Includes binary-to-decimal reverse conversion, step-by-step division method, bit visualization, two's complement, batch mode, and a powe..
Decimal to Fraction Calculator
Convert any decimal to a simplified fraction or mixed number. Supports repeating decimals, batch mode, Egyptian fractions, visual fraction bars, and a reference table of common conversions.
Decimal to Minutes Degrees Calculator
Convert decimal degrees to degrees and decimal minutes with latitude, longitude, and bearing support, DMS preview, range checks, presets, and reference tables.
Decimal to Percent Calculator
Convert decimals to percentages and vice versa. Includes basis points, per mille, batch mode, fraction display, visual percentage bar, and a reference table of common conversions.
Dividing Fractions Calculator
Divide fractions step-by-step using the keep-change-flip method. Supports mixed numbers, whole number divisors, reciprocal display, visual fraction bars, presets, and a detailed steps table.
Divisibility Calculator
Check if a number is divisible by 2–12 and any custom divisor. See divisibility rules, digit sums, prime factorization, all divisors, visual grid, and a range checker with color-coded results.
Division Calculator
Divide numbers with long-division steps, quotient and remainder, simplified fraction, decimal precision control, inverse verification, divisibility rules table, and visual progress bars.
Factor Calculator — Find All Factors of a Number
Find every factor (divisor) of a number, view factor pairs, check prime or composite status, sum of divisors, perfect number test, divisibility rules, and factor magnitude visualization.
Factorial Calculator
Compute n! with step-by-step multiplication, permutations, combinations, double factorial, Stirling approximation, trailing zeros, digit count, growth visualization, and a reference table up to 25!.
Floor Division Calculator
Compute floor division, compare it with truncation, inspect Euclidean remainders, and test batch or growth scenarios for integer grouping.
Floor Function Calculator
Compute the floor ⌊x⌋ of any real number. Compare floor, ceiling, round, and truncate side-by-side, explore the fractional part, visualize the step function, and browse a comparison table for a ran...
Fraction to Decimal Calculator
Convert any fraction or mixed number to a decimal. Detects repeating decimals, shows long division steps, supports batch mode, and includes a reference table of 20 common fractions.
Fraction to Percent Calculator
Convert any fraction to a percentage and vice versa. Includes letter grade mapping, visual pie representation, basis points, batch mode, and a reference table of 20 common fractions.
GCD Calculator — Greatest Common Divisor
Calculate the Greatest Common Divisor (GCD) of two or more numbers using the Euclidean algorithm or prime factorization method. View step-by-step solutions, Bézout coefficients, LCM, and coprimalit...
GCF and LCM Calculator
Find the greatest common factor and least common multiple of 2 to 4 numbers with factor tables, fold steps, divisor lists, and common-multiple outputs.
GCF Calculator — Greatest Common Factor
Find the Greatest Common Factor (GCF) of two numbers using factor listing or a Venn diagram. Simplify fractions, see common factors, and explore the GCF-LCM relationship.
Greater Less Calculator
Compare two or more numbers with number-line visualization, digit-by-digit comparison, distance, midpoint, ratio, relative difference, sorted ordering, and properties table.
Improper Fraction Calculator
Convert between improper fractions and mixed numbers. Features visual representation, batch mode, number line position, preset examples, and a conversion reference table.
Integer Arithmetic Calculator
Perform addition, subtraction, multiplication, and division on integers. Shows sign rules, number properties (even/odd, prime, factors), absolute values, presets, a sign rules reference table, and...
Integer Properties Calculator
Analyze any integer: even/odd, prime check, full prime factorization, all divisors, digit sum, digital root, binary/hex/octal representation, nearest primes, and number classification.
Inverse Modulo Calculator
Find the modular multiplicative inverse a⁻¹ mod m using the Extended Euclidean Algorithm with step-by-step EEA table, Euler method, verification, and invertible-elements reference.
Is Modulo Associative Calculator
Test whether modulo is associative by comparing (a mod m) mod n vs a mod (m mod n). Side-by-side steps, visual bars, counter-example scanner, and coincidence detector.
Lattice Multiplication Calculator
Multiply numbers using the lattice (grid/Napier) method step-by-step. Visualize the lattice grid, diagonal sums, carries, and compare with the standard algorithm. Supports presets and a detailed st...
LCM Calculator — Least Common Multiple
Calculate the Least Common Multiple (LCM) of two or more numbers using prime factorization or listing multiples. Step-by-step solutions, GCD relationship, multiplier bars, and common multiples.
Least Common Multiple (LCM) Calculator
Calculate LCM for 2–5 numbers using prime factorization. Step-by-step pairing, prime factor comparison table, power-contribution bars, and highlighted multiples grid.
Long Addition Calculator
Add aligned whole numbers or decimals with a long-addition layout, carry table, running-total visual, estimate check, and target comparison.
Long Division Calculator
Perform long division step-by-step with bring-down and subtract stages. Detect repeating decimals, display quotient as fraction and decimal, explore presets, and view a detailed steps table.
Long Multiplication Calculator
Multiply numbers step-by-step showing partial products, place value shifts, carries, and the final sum. Includes presets, a partial products table, carry visualization, and grid-method comparison.
Long Subtraction Calculator
Subtract aligned whole numbers or decimals with a vertical layout, regrouping table, running remainder visual, target check, and answer verification.
Minutes to Decimals Degrees Calculator
Convert degrees and decimal minutes to decimal degrees with sign control, minute carry handling, range checks, radian output, presets, and reference tables.
Mixed Number Calculator
Perform all four operations on mixed numbers — add, subtract, multiply, divide. Converts to improper fractions, shows step-by-step solution, visual parts, and simplification.
Modulo Calculator
Calculate modular arithmetic with clock visualization, congruence checker, modular inverse, equivalence class display, multiple mod conventions, and a properties reference table.
Modulo of Negative Numbers Calculator
Handle negative modulo correctly across truncated, floored, and Euclidean conventions. Language comparison table, number-line visual, and range-scan highlighting where results differ.
Multiplication Calculator
Multiply numbers with a partial-products breakdown, multi-factor chain, sign rule analysis, times table reference, progress bars, and a properties reference table.
Multiplicative Inverse (Reciprocal) Calculator
Find the multiplicative inverse (reciprocal) for integers, fractions, decimals, and mixed numbers. Verify that a × a⁻¹ = 1 and explore inverse properties in batch mode.
Multiplicative Inverse Modulo Calculator
Find x such that ax ≡ 1 (mod m) with full Extended Euclidean Algorithm steps, Euler theorem method, brute-force verification, Bézout identity, and all inverse pairs table.
Multiplying Fractions Calculator
Multiply fractions and mixed numbers step-by-step. Features cross-cancellation, area model visual, presets, GCD simplification, and a detailed steps table.
Operand & Operator Identifier Calculator
Educational tool to identify operands, operators, and structure in arithmetic expressions. Parses expressions, counts operands, shows operator precedence, expression breakdown table, and a visual e...
Order of Operations Calculator (PEMDAS/BODMAS)
Evaluate mathematical expressions with step-by-step PEMDAS/BODMAS breakdown. Shows each operation in order, highlights parentheses and exponents, provides rules reference table and common mistakes.
Partial Products Multiplication Calculator
Multiply numbers using the partial products method. Visual area model, step-by-step breakdown of each digit pair, comparison with the standard algorithm, and contribution analysis.
Parts Per Million (PPM) Calculator
Convert between ppm, ppb, ppt, percent, mg/L, and µg/L. Includes a dilution calculator, magnitude scale visualization, conversion table, and reference limits for water quality and air quality.
Percent Change Calculator
Calculate the percentage increase or decrease between two values. Find percent change, new value from a percent, or the original value. Includes multiplier, reverse change, compound growth table, a...
Percent Difference Calculator
Calculate the symmetric percent difference between two values. Choose from five reference bases, view absolute and relative differences, ratio, log ratio, sensitivity analysis, and visual compariso...
Percent Error Calculator
Calculate percent error between experimental and theoretical values. Includes absolute, relative, and signed error, tolerance checking, multiple-measurement statistics, and visual error bars.
Percent of Percent Calculator
Calculate X% of Y%, apply it to a value, chain three percentages, or reverse-find the missing percent. Step-by-step breakdown, comparison table, visual bar, and presets included.
Percent Off Calculator
Calculate the sale price after a percentage discount, see the exact dollar savings, apply a second coupon, add sales tax, and compare savings across discount levels. Discount comparison table, coup...
Percent Time Calculator
Calculate percentages of time, elapsed-time percentages, remaining durations, reverse total timelines, and scaled durations with hh:mm:ss outputs and checkpoint tables.
Percent to Decimal Converter
Convert percent to decimal and decimal to percent, with batch conversion, optional scientific notation, fraction output, and a visual bar. Includes a common conversions reference table.
Percent to Fraction Converter
Convert any percentage to a simplified fraction, mixed number, and decimal. Supports fraction-to-percent conversion, batch mode, visual part-of-whole display, and a 22-row common conversions refere...
Percent to Goal Calculator
Measure progress toward a goal from a starting point, see remaining percentage and amount, track stretch-goal progress, and estimate the pace needed per period.
Percentage Calculator
Calculate percentages with four modes: find X% of Y, what percent X is of Y, find the base, and percentage change. Includes visual bars, comparison table, and mental math shortcuts.
Percentage Decrease Calculator
Calculate the new value after a percentage decrease, find the percent decrease between two values, reverse-calculate the original value, or model compound decay. Decay table, half-life indicator, v...
Percentage Increase Calculator
Calculate the new value after a percentage increase, find the percent increase between two values, reverse-calculate the original, or project compound increases. Growth table, visual bars, and quic...
Percentage of Percentage Calculator
Work out one percentage of another percentage, apply the result to a base value, compare two percentage rates, chain three percentages, or solve for a missing factor.
Percentage Point Calculator
Measure percentage-point and basis-point changes between two rates, convert them to dollar impact on a base amount, and compare moves across scenarios.
Place Value Calculator
Break down any number by place value. Shows expanded form, word form, standard form, scientific notation, digit visualization, base conversions, and contribution percentages.
Prime Factorization Calculator — Factor Tree & Divisors
Decompose any number into its prime factors with an interactive factor tree, exponent notation, divisor count, sum of divisors, Euler's totient, composition bar, and full divisor table.
Quotient and Remainder Calculator
Calculate the integer quotient, remainder, decimal quotient, and fraction form of any division. Verify with the Euclidean division theorem, explore a division table, and see visual grouping of the...
Reciprocal Calculator
Find the reciprocal (multiplicative inverse) of integers, fractions, decimals, and mixed numbers. Verify the product identity, compute power reciprocals, and explore reciprocal properties with visu...
Relative Change Calculator
Calculate relative change, absolute change, percentage change, relative difference, and symmetric relative change between two values. Includes visual comparison bars, presets, and a reference table.
Remainder Calculator
Calculate the remainder from division, verify the division algorithm, compare truncated/floored/Euclidean conventions, check modular congruence, and explore remainders over a range with visual bars.
Round to Nearest Calculator
Round numbers to the nearest 5, 10, 25, 50, 100, 1000, or any custom interval. Compare rounding intervals, process batches of numbers, and visualize where values fall between multiples.
Round to the Nearest Cent Calculator
Round invoice totals, line items, and tax-inclusive amounts to the nearest cent with discount, shipping, payment, and method comparisons.
Round to the Nearest Dollar Calculator
Round order totals, monthly spending plans, and budget estimates to the nearest dollar with tax, tip, fee, and frequency analysis.
Round to the Nearest Hundred Calculator
Round counts, totals, and projections to the nearest hundred, compare group totals, and see how estimate bands change under different rounding methods.
Round to the Nearest Hundredth Calculator
Round values to two decimal places with hundredths and thousandths guidance, method comparison, repeated-value drift, batch rounding, and interval visualization.
Round to the Nearest Integer Calculator
Round decimals to the nearest integer with method comparison, repeated-value drift analysis, batch rounding, and a number-line visual between whole numbers.
Round to the Nearest Penny Calculator
Round interest, fees, and payoff balances to the nearest penny while tracking exact interest, daily accrual, repeated drift, and payment scenarios.
Round to the Nearest Ten Calculator
Round values to the nearest ten, compare rounding methods, test grouped totals, and see cutoff bands for reports, estimates, and planning.
Round to the Nearest Tenth Calculator
Round values to one decimal place with digit-by-digit guidance, method comparison, repeated rounding drift, batch analysis, and a tenth-interval visual.
Round to the Nearest Thousand Calculator
Round populations, sales, budgets, and inventory totals to the nearest thousand with method comparisons, group scenarios, and batch analysis.
Round to the Nearest Thousandth Calculator
Round decimals to the nearest thousandth, inspect deciding digits, compare rounding methods, and measure repeated rounding drift.
Rounding Calculator
Round numbers to any decimal place using six different methods -- half up, half down, banker's rounding (half even), ceiling, floor, and truncation. Compare all methods side-by-side with a..
Scientific Notation Calculator
Convert numbers to and from scientific notation, perform arithmetic operations (add, subtract, multiply, divide) on scientific numbers, view engineering notation with SI prefixes, and explore magni...
Sign Function (sgn) Calculator
Compute sgn(x) for any number or expression, see absolute value connection, product-of-signs rule, power rule, number line visualization, sign table for a range, and properties reference.
Significant Figures Calculator
Count significant figures in any number, round to N sig figs, view digit-by-digit significance breakdown, convert to scientific notation, and compare rounding levels with a visual precision bar.
Subtracting Fractions Calculator
Subtract fractions with unlike denominators using the LCD method. Supports mixed numbers, borrowing, step-by-step solution table, visual fraction bars, and presets.
Subtraction Calculator
Subtract multiple numbers with step-by-step borrowing visualization, running totals, base conversion, cumulative progress bars, and a comprehensive properties reference table.
Sum & Product Calculator
Calculate sum, product, arithmetic/geometric/harmonic means, sum of squares, power sums, and cumulative totals for any set of numbers.
Terminating Decimals Calculator
Check whether a fraction produces a terminating decimal, factor the denominator, preview repeating digits, and compare nearby denominators.
Unit Rate Calculator
Calculate unit rates for prices, speed, pay, productivity, or fuel efficiency with comparison tables, benchmark scaling, and better-value checks.
Uses of Modulo Calculator
Interactive explorer of 12 real-world modulo applications: clock arithmetic, even/odd, cyclic indexing, day of week, hashing, digit extraction, color cycling, leap year, and more.
Weighted Average Calculator
Calculate weighted averages with dynamic value–weight pairs, GPA letter-grade mode, weight normalization, contribution breakdown table, and visual weight-distribution bars.