OnlineCalculator360
Percent Decrease Calculator
Calculate the percentage decrease between two numbers instantly. Enter the original and new value to find the exact percentage drop and absolute change.
Open →Percent Increase Calculator
Calculate the percentage increase between two numbers instantly. Enter the original and new value to find the exact percentage growth and absolute change.
Open →Percentage Difference Between Two Numbers
Find the percentage difference between two values using their average as the base. Ideal for symmetric comparisons with no fixed reference point.
Open →Percentage to Fraction Converter
Convert any percentage to a simplified fraction instantly. Get the reduced fraction and decimal equivalent with step-by-step working shown.
Open →Fraction to Percentage Converter
Convert any fraction to a percentage in seconds. Enter the numerator and denominator to get the exact percentage and decimal value with formula.
Open →Percentage to Decimal Converter
Convert any percentage to its decimal form instantly. Useful for formulas, spreadsheets, and programming. Shows fraction over 100 and full working.
Open →Percent Error Calculator
Calculate percentage error between an approximate and exact value. See error percentage, absolute difference, and whether the result is an over- or underestimate.
Open →Sale Price & Discount Calculator
Find the final price after any percentage discount. Enter the original price and discount to see the sale price and amount saved instantly.
Open →Percentage of a Percentage Calculator
Calculate a percentage of a percentage — like 30% of 40%. Useful for nested discounts, tax-on-tax calculations, and probability. Shows full formula.
Open →Rectangle Area Calculator
Calculate the area of any rectangle instantly. Enter length and width in any unit to get the exact area with the formula shown.
Open →Rectangle Diagonal Calculator
Calculate the diagonal of any rectangle using the Pythagorean theorem. Also shows area and perimeter. Works for rooms, screens, and plots.
Open →Rectangle Area, Perimeter & Diagonal
Find area, perimeter, and diagonal of any rectangle in one step. Enter length and width and get all three measurements with formulas shown.
Open →Circle Area Calculator
Calculate the area of a circle from its radius using πr². Also shows circumference. Useful for circular plots, pools, and round surfaces.
Open →Circle Circumference & Area Calculator
Enter the radius to get area, circumference, and diameter of any circle — all in one calculation with formulas shown.
Open →Box Volume & Surface Area Calculator
Find volume, surface area, and space diagonal of a cuboid from length, width, and height. Useful for boxes, rooms, and storage spaces.
Open →Cylinder Volume & Capacity Calculator
Calculate cylinder volume, lateral surface area, and total surface area from radius and height. Ideal for water tanks, pipes, and cans.
Open →Sphere Volume & Surface Area Calculator
Calculate the volume and surface area of a sphere from its radius. Works for balls, tanks, domes, and any spherical object.
Open →Cube Root Finder
Find the cube root of any positive or negative number instantly. Also shows the square root and fourth root. Works for all real numbers including negatives.
Open →Mean, Median & Mode Calculator
Calculate the average of any list of numbers instantly. Paste comma or newline-separated values to get the mean, median, sum, count, min, and max in one click.
Open →Decimal to Fraction Converter
Convert any decimal to a simplified fraction instantly. Enter a decimal like 0.75 and get the reduced fraction, mixed number, and percentage equivalent with formula shown.
Open →Weighted Average of Percentages Calculator
Calculate the average of multiple percentages instantly. Enter percentage values separated by commas to get the mean, sum, min, and max — useful for exam scores, surveys, and rates.
Open →Quadratic Equation Solver
Solve any quadratic equation ax² + bx + c = 0 instantly. Enter a, b, and c to get both roots, the discriminant, and the nature of roots — real or complex.
Open →Average Rate of Change Calculator
Calculate rate of change (slope) between two points. Enter x₁, y₁, x₂, y₂ to get the rate, direction, absolute change, and percentage change instantly.
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