Apportionment Calculator

Apportionment Calculator divides seats among states using the seven classic apportionment methods, including the one that divides the U.S. House of Representatives, and shows you exactly how each answer was reached. It's made for students and teachers in math for liberal arts, quantitative reasoning, and political science courses, and for anyone curious about how House seats are divided. SEVEN METHODS • Hamilton's method • Jefferson's method • Webster's method • Adams' method • Lowndes' method • Huntington-Hill method • Equal proportions CALCULATE Enter the number of seats and each state's population to get a clear table with every number along the way: the standard divisor, each state's quota, the modified divisor where there is one, and the final seats. • Exact math, so there are no rounding errors, and no trailing zeros • If a method can't give an answer, the app tells you why, for example when two states are tied for the last seat, or when there are fewer seats than states for a method that guarantees every state a seat • Import from a CSV file, an Excel spreadsheet (.xlsx), Google Sheets, or the clipboard: the seats first, then one population per row. State names come along too. COMPARE See all seven methods side by side, with any state that gets a different number of seats from most methods highlighted. Tap a method to open it. LEARN Each method is worked through step by step with your own numbers. You also get a short explanation of how it works and its history: who created it, whether and when Congress used it, and a fact worth knowing. SAVED • Every calculation is saved automatically (your last 50), and starred ones are kept for good • Search, rename, and reopen past calculations • Share results as text, or export a CSV of one method or all seven, then share it or save it straight to your device • Undo if you delete or clear something by accident MAKE IT YOURS Choose Graphite, Blue, Red, Green, or your device's own colors, in light or dark mode. PRIVATE AND OFFLINE No account, no ads, and no internet connection needed. Your calculations stay on your device.