Free online tools
Calculators that make the numbers clear.
Choose a calculator for personal finance, investing, business, statistics, or everyday math. Each tool explains the result and shows how the calculation works.
44 practical calculatorsNo sign-up requiredFormula explanations included
A good place to start
Popular calculators
Quick answers for some of the most common financial and business questions.
$
Personal Finance Calculators
Plan savings, debt, housing, and retirement decisions.
↗
Investment Calculators
Evaluate returns, growth, value, and financing costs.
▦
Business Calculators
Understand profitability, pricing, depreciation, and performance.
σ
Statistics & Math Calculators
Analyze samples, distributions, relationships, and variation.
Standard Deviation CalculatorZ-Score CalculatorCorrelation CoefficientPercentile Rank CalculatorSample Size CalculatorOutlier Calculator (IQR)Residual CalculatorRelative Frequency CalculatorWeighted Average CalculatorClass Width CalculatorMean, Median & ModeVariance CalculatorStandard Error CalculatorChi-Square CalculatorP-Value CalculatorConfidence Interval CalculatorPermutation & Combination
123
Math & Utility Calculators
Handle percentages, dates, groups, and everyday calculations.
More than just an answer
Each calculator is designed to be straightforward to use, with an explanation of the result and the calculation behind it. New calculators will continue to be added to this directory.
