每天更智能地计算

基本 计算器

Standard arithmetic operations. Enter your values — see the result with formula, examples, and step-by-step working. Free.

百分比计算器

Calculate percentages, increases and decreases. Quick calculation with worked example and formula. Free everyday calculator.

二次公式

Solve any quadratic equation ax²+bx+c=0. Enter coefficients — get all roots via quadratic formula, completing the square, and factorisation. Free.

小费 计算器

Calculate the tip amount for any restaurant bill. Enter the total and tip % — see tip per person, total including tip, and custom tip amounts. Free.

折扣 计算器

Calculate Discount quickly and accurately. Enter your values — see the result with the formula, worked example, and unit options. Free.

平均值中位数众数

Calculate mean, median, and mode of any dataset. Enter values — see all three averages, sorted data, frequency table, and range. Free.

测试成绩 计算器

Convert correct answers to percentage and letter grade. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

随机数 生成器

Generate random numbers in any range with or without repetition. Enter min, max, and count — see your random numbers instantly. Free.

成绩 计算器

Calculate Grade quickly and accurately. Enter your values — see the result with the formula, worked example, and unit options. Free.

矩阵 2×2 计算器

Determinant, inverse, addition and multiplication of 2×2 matrices. See formula, step-by-step solution and all rearrangements. Instant math solver.

勾股定理

Apply the Pythagorean theorem to find any side of a right triangle. Enter two sides — get the missing side with proof shown. Free.

三角函数计算器

Calculate trig function values for any angle. Enter degrees or radians — see sin, cos, tan, cot, sec, csc with unit circle position. Free.