Math calculators

Free math calculators with formulas shown on every page.

• Percentage calculatorPercent, part, whole — solve any one.
• Percentage Change calculatorHow much something moved from old to new.
• Decimal To Fraction calculatorFinite decimals to lowest terms.
• Fractions calculatorAdd, subtract, multiply, divide, then simplify.
• Prime Factors calculatorFactor an integer and write the exponents.
• Decimal Hex calculatorThe programmer's everyday bases.
• Roman Numerals calculatorConvert 1–3999 both ways.
• Sig Figs calculatorRound to N significant figures.
• Final Grade calculatorWhat you need on the final to hit a target.
• Uni Grade calculatorHomework / midterm / final weighted sum.
• Gpa calculatorCredit-hour weighted GPA.
• Statistics calculatorMean, median, standard deviation.
• Quadratic calculatorax² + bx + c = 0.
• Pythagorean calculatorThe missing side of a right triangle.
• Aspect Ratio calculatorScale images and video frames.
• Rule Of 72 calculatorYears for money to double.
• Scientific calculatorExpression evaluator — no eval().
• Triangle calculatorSSS via Heron, or two legs of a right triangle.
• Circle calculatorRadius → area, circumference, diameter.
• Combinations calculatornCr and nPr.
• Gcd Lcm calculatorGreatest common divisor and least common multiple.
• Slope calculatorTwo points → slope, intercept, distance.
• Scientific Notation calculatorPlain number ↔ a × 10^n.
• Logarithm calculatorlog base b of x.
• Exponent calculatorb^n, including fractional exponents.
• Speed Distance calculatorAny two give the third.
• Mixed Numbers calculatorTo improper fractions, then a common denominator. Show work.
• Z Score calculatorz = (x−μ)/σ, then a two-tailed p.
• Confidence Interval calculatorx̄ ± z·σ/√n.
• Sample Size calculatorn = z²p(1−p)/E².
• Graphing Calculator calculatorType y = f(x) and plot it.
• Least Common Denominator calculatorTwo fractions, one LCD, every step shown.
• Weighted Grade calculatorHomework, quizzes, final — weighted total.