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기본 계산기

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

백분율 계산기

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

이차 방정식

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

팁 계산기

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.

할인 계산기

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

평균 중앙값 최빈값

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

시험 성적 계산기

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

난수 생성기

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

성적 계산기

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

행렬 2×2 계산기

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

피타고라스 정리

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

삼각함수 계산기

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