Deadweight Loss Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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A finance formula can look precise even when the assumptions behind it are doing most of the work. Deadweight Loss Calculator keeps those assumptions visible and turns the fields on this page into one focused result. On this page, it estimates the triangular welfare loss associated with the entered price increase and quantity reduction.

What this calculator does

Deadweight Loss Calculator estimates the triangular welfare loss associated with the entered price increase and quantity reduction. Its visible inputs are Original price, New price, Original quantity, New quantity. The article follows those fields and the calculation that is actually available on this page; it does not silently add live market feeds, tax tables, legal eligibility tests, or other variables that are not present in the tool.

How to use it

Enter Original price, New price, Original quantity, New quantity. Use the units and percentage scale shown beside each field, and keep values on the same time basis when the formula compares income, rates, prices, balances, or work hours.

How the calculation works

Deadweight loss is modeled as ½ × (new price − original price) × (original quantity − new quantity), the area of the quantity-loss triangle created by the price wedge.

Example

Using the page’s demonstration values (Original price = 10; New price = 12; Original quantity = 100; New quantity = 80) and leaving the remaining defaults unchanged, the calculator returns $20 for deadweight loss. Replace the sample inputs with values from the same period and definition before interpreting your own result.

How to interpret the result

Read the result as a model of the economic relationship represented by the inputs, not as a forecast of what an economy, market, currency, or policy authority will do next. Economic data are definition-sensitive: nominal versus real values, time periods, population bases, and price indexes must be aligned before comparing results.

Limitations and notes

Simplified macroeconomic formulas hold other influences constant. Revisions to source data, measurement definitions, expectations, policy responses, market frictions, and nonlinear behavior can make real-world outcomes differ from the clean relationship shown here.