オンライン計算機

Estimate required sample size for a proportion using confidence level, margin of error, and expected proportion.

Estimate a confidence interval for a mean using standard deviation, sample size, and a common confidence level.

Estimate percentile rank for a target value inside a dataset.

Measure the spread of a dataset with quartiles and interquartile range.

Solve a two-equation linear system for x and y using coefficients in standard form.

Solve a basic linear equation for x from coefficients in the form ax plus b equals c.

Calculate logarithms for algebra, exponential growth work, and quick inverse power checks.

Calculate powers from a base and exponent for algebra, 科学, and quick number checks.

Convert decimal numbers into simplified fraction form for schoolwork, recipes, and quick math checks.

Convert fractions and mixed numbers into decimal values and percentages.