คำนวณอย่างชาญฉลาดทุกวัน

Basic Calculator

Standard arithmetic operations. Instant result with formula, examples and step-by-step calculation. Free online calculator.

Percentage Calculator

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

Quadratic Formula

Solve ax² + bx + c = 0 equations. See formula, step-by-step solution and all rearrangements. Instant math solver.

Tip Calculator

Calculate tips and split bills. Quick calculation with worked example and formula. Free everyday calculator.

Discount Calculator

Calculate discounts and sale prices. Quick calculation with worked example and formula. Free everyday calculator.

Mean Median Mode

Calculate central tendency measures. Step-by-step solution with formula, example dataset and interpretation guide.

Test Grade Calculator

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

Random Number Generator

Generate random numbers in any range. Instant result with formula, examples and step-by-step calculation. Free online calculator.

Grade Calculator

Calculate class grades and GPA. Instant result with formula, worked example and step-by-step solution. No signup required.

Matrix 2×2 Calculator

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

Pythagorean Theorem

Find sides of right triangles. Instant result with formula, worked example and step-by-step solution. No signup required.

Trig Functions Calculator

Calculate sin, cos, tan and more. Instant result with formula, worked example and step-by-step solution. No signup required.