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Arithmetic & Number Calculators
Percentage, fraction, ratio, rounding, number and basic math calculators. 46 free tools that run in your browser, no sign-up needed.
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Percentage CalculatorWork out percentages, increases and decreases.Percentage Change CalculatorPercent increase or decrease between two values, and reverse.Percentage Difference CalculatorFind the percent difference between two values, with the formula.Ratio CalculatorSimplify, solve and scale ratios with step-by-step working.Proportion CalculatorSolve A/B = C/D for x with cross multiplication steps.Scientific CalculatorTrig, logs, powers and more in your browser.Fraction CalculatorAdd, subtract, multiply and divide fractions with steps.Multiplication Table GeneratorPrintable multiplication charts up to 30 × 30, single tables and practice sheets.Times Tables PracticeTimed times tables drills with a number pad, streaks and an accuracy heatmap.Fraction VisualizerInteractive fraction circles and bars: equivalents, comparing, adding and simplifying.Number Line GeneratorDraw number lines with any range, fractions or decimals, points, jumps and inequalities.Significant Figures CalculatorCount sig figs, round to any number of significant figures and do arithmetic with sig fig rules.Scientific Notation ConverterConvert numbers to and from scientific, engineering and E-notation, with exact digits and SI prefixes.Caffeine CalculatorAdd up daily caffeine, compare it with 400 mg and see how much is left at bedtime.Percent Error CalculatorPercent error between experimental and theoretical values, for one result or several trials.Rounding CalculatorRound to decimal places, significant figures or the nearest 10, 100 or 0.5, any rule.Long Division CalculatorDivide with quotient, remainder, decimals and a step-by-step long division layout.Cube Root CalculatorFind cube roots and nth roots, check perfect cubes and simplify radicals.2-Stroke Oil Mix CalculatorHow much 2-stroke oil to add to gas for 50:1, 40:1, 32:1 and more, in fl oz or ml.Math Worksheet GeneratorCreate printable addition, subtraction, multiplication and division worksheets with answer keys.Simplify Fractions CalculatorReduce any fraction to lowest terms with GCD steps, mixed number, decimal and equivalents.Complex Number CalculatorAdd, subtract, multiply, divide complex numbers; polar form, modulus, argument, powers and roots.Big Number CalculatorExact + − × ÷ mod and powers for huge integers with hundreds of digits, plus digit count.Three-Phase Power CalculatorkW, kVA and kVAR from volts, amps and power factor, or three-phase current from kW or kVA.Compression Ratio CalculatorStatic engine compression ratio from bore, stroke, chamber, gasket, deck and piston volume.Expanded Form CalculatorWrite any number or decimal in expanded form, word form and a place value chart.Mixed Number CalculatorAdd, subtract, multiply and divide mixed numbers, or convert improper fractions, with steps.Nth Root CalculatorAny root of any number: real nth root, simplified radical and all complex roots.Long Multiplication CalculatorMultiply whole numbers or decimals with the column method shown digit by digit.Matrix Multiplication CalculatorMultiply matrices up to 8×8 with every dot product shown, exact fractions and a size check.Order of Operations Calculator (PEMDAS)Solve arithmetic expressions step by step with PEMDAS/BODMAS, brackets, powers and fractions.Virtual Base Ten BlocksDrag ones, rods, flats and cubes onto a place value mat to model regrouping, addition and subtraction.Compare Fractions CalculatorCompare two or more fractions with <, > or = and put them in order, with steps.Equivalent Fractions CalculatorList equivalent fractions, check if two are equal, or find a missing number, with bars.Map Scale CalculatorConvert map distance to real distance and back for scales like 1:24,000 or 1 in = 1 mi.Math Formulas Cheat SheetSearchable algebra, geometry, trig, calculus and statistics formulas with a printable sheet.Number Properties CalculatorIs it prime, perfect, square, triangular or Fibonacci? See every property of a number.Paper Tape CalculatorAdding machine calculator with a running paper tape: edit entries, subtotals, notes, print or export.Pi Digits CalculatorCalculate π to up to 100,000 digits, find any number or your birthday in pi, and download it.PSAT Score CalculatorEstimate your PSAT/NMSQT section scores, total score and National Merit Selection Index.Rational Expressions CalculatorSimplify, add, subtract, multiply and divide rational expressions with excluded values.Rationalize the Denominator CalculatorRemove square roots and cube roots from a denominator, with conjugates and full steps.Reverse Percentage CalculatorFind the original value before a percentage increase or decrease, or the whole from a part.Riemann Sum CalculatorLeft, right, midpoint and trapezoid sums of f(x) on [a, b] with a table and rectangle graph.Sum CalculatorPaste any list or column of numbers to get the total, count, average, min and max instantly.Unit Rate CalculatorFind the unit rate (per 1) from two quantities, compare rates and see the steps.
About Arithmetic & Number Calculators
Everyday math: percentages, percentage change, fractions, ratios, rounding and a full scientific calculator. These answer common questions like what 15% of a bill is or how much a price went up.
Most used here: Percentage Calculator, Percentage Change Calculator and Percentage Difference Calculator.