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Economics Tools

Free browser-based economics calculators for linear supply-demand equilibrium price and Gini coefficient inequality with Lorenz curves. No sign-up required.

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This directory provides focused utilities for two quantitative economics workflows: linear competitive market equilibrium solving and distributional inequality calculation. Both calculators run directly in your web browser using client-side JavaScript without requiring an account or sign-up.

Available Economics Calculators

  • Equilibrium Price Calculator: Solves simultaneous linear equations for competitive market equilibrium. You enter linear supply ($Q_s = a + bP$) and demand ($Q_d = c - dP$) coefficients to calculate the market-clearing price ($P^*$) and quantity ($Q^*$) and view the intersecting schedules on a chart.
  • Gini Coefficient Calculator: Measures dispersion across an observed distribution of income, wealth, or revenue. Input a set of numerical values to compute the Gini coefficient (0 to 1 scale) and Gini index (0 to 100 scale), alongside a Lorenz curve plotted against the 45-degree line of perfect equality.

For statistical analysis such as regression and dispersion metrics, browse Statistics Tools; for financial calculations, explore Finance Tools.

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Frequently asked questions

Which calculators are included in the Economics Tools directory?

The directory currently contains two utilities: the Equilibrium Price Calculator and the Gini Coefficient Calculator. The directory focuses specifically on linear supply-demand equilibrium and distributional inequality rather than broad macroeconomic measures like GDP or CPI inflation.

How does the Equilibrium Price Calculator determine market equilibrium?

The calculator solves the simultaneous equation system where quantity supplied equals quantity demanded. Given linear equations Qs = a + bP and Qd = c - dP, it computes the market-clearing equilibrium price as P* = (c - a) / (b + d) and substitutes that price into the supply function to find equilibrium quantity Q* = a + b * P*, plotting both curves on an interactive chart.

How is the Gini coefficient computed and interpreted?

The Gini Coefficient Calculator ranks user-entered non-negative values in ascending order and evaluates relative dispersion using the formula G = (2 * sum of rank-weighted values) / (n * total) - (n + 1) / n. A coefficient of 0 indicates perfect equality where every observation holds the identical positive share. In a finite sample of size n where all positive resources belong to a single owner, the empirical formula attains an upper boundary of (n - 1) / n rather than 1. Contextual interpretation depends on the specific domain, reference population, and unit of analysis.

What is the Lorenz curve and how does it relate to the line of perfect equality?

The Lorenz curve plots cumulative population share along the horizontal axis against cumulative income or wealth share along the vertical axis. The tool displays this curve alongside a 45-degree diagonal representing perfect equality; the farther the Lorenz curve bows below that diagonal, the greater the inequality in the distribution.