Numbers & Algebra

Everyday algebra worked step by step: percentages and percentage change, ratios and proportions, fractions to decimals and back, rounding, and the quadratic formula with real and complex roots.

7 free numbers & algebra tools, no signup.

• Decimal to Fraction ConverterConvert a decimal number to a reduced fraction, shown as an improper fraction and a mixed number.
• Fraction to Decimal ConverterConvert a fraction to its decimal value by dividing the numerator by the denominator.
• Percentage CalculatorFree percentage calculator for three questions: what is X% of Y, X is what percent of Y, and the percent change from one value to another.
• Percentage Change CalculatorCalculate the percentage increase or decrease between two numbers, with the raw difference. Fast and private.
• Percentage Increase CalculatorCalculate the percentage increase between two numbers. Enter the old and new values to get the percent change and the difference.
• Quadratic Formula CalculatorSolve ax^2 + bx + c = 0 with the quadratic formula. Get real or complex roots, the discriminant, and the vertex.
• Ratio CalculatorSimplify a ratio to lowest terms or solve a proportion for a missing term. Handles A:B and A:B = C:x.