毎日スマートに計算

基本 計算機

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

パーセンテージ計算機

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

二次方程式

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

チップ 計算機

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.

割引 計算機

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

平均値中央値最頻値

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

テスト成績 計算機

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

乱数 ジェネレーター

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

成績 計算機

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

行列 2×2 計算機

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

ピタゴラスの定理

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

三角関数計算機

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