Calculate tribute owed to Tenochtitlan based on the Codex Mendoza system — cacao, cloth, jade, feathers & more
The Aztec Triple Alliance (Tenochtitlan, Texcoco, and Tlacopan) extracted tribute from over 370 conquered towns across Mesoamerica. The Codex Mendoza, compiled circa 1541, records annual tribute demands including up to 400 loads of cacao (each load = 24,000 beans), thousands of cotton mantles, warrior costumes, gold discs, jade beads, feathered war standards, and live eagles. Provinces were classified by wealth and geographic specialization — coastal towns paid feathers and seafood, highland towns paid cotton and obsidian. The tribute system sustained a capital city of ~200,000–300,000 people and funded the empire's continuous military expansion.
| Good | Unit | Per Cycle | Per Year | 10-Year Total | Modern Weight |
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Enter your province's population in households, select how many tribute cycles occurred per year (1–4), choose the province type to reflect its geographic specialization, then check which goods it was known to produce. Adjust the resistance slider to model how conquered peoples' compliance (or defiance) affected tribute loads. Hit "Estimate Tribute Roll" to see per-cycle, annual, and multi-year cumulative totals for each good.
The output table mirrors the format of the actual Codex Mendoza tribute lists, with historically grounded quantities based on real archaeological and documentary evidence. Modern weight equivalents are provided for scale.
The Aztec tribute system was one of the most sophisticated extraction economies in pre-Columbian history. Scholars estimate that Tenochtitlan received tribute from roughly 371 subject towns across 38 provinces. The annual inflow sustained not just the ruling class, but an entire imperial bureaucracy — tax collectors (calpixque), merchant guilds (pochteca), and military garrisons.
Understanding tribute loads helps historians reconstruct population sizes, economic specialization, and the political geography of the Aztec empire. For example, the province of Tochtepec on the Gulf Coast delivered rare tropical goods: 9,600 quetzal feathers, 200 jade beads, 800 loads of cacao, and 40 gold discs per year — demonstrating the empire's deliberate strategy of acquiring luxury goods unavailable in the highland Valley of Mexico.
This tool lets students, educators, and history enthusiasts explore how province characteristics translated into real economic demands — and how those demands might have felt to the people paying them.
Quantities are derived from a base household assessment model, calibrated against documented Codex Mendoza figures. The core formula per good per cycle is:
Tribute = BaseRate × Households × ProvinceMultiplier × ResistanceFactor × CycleScaler
All units follow documented Aztec measures: the carga (load ≈ 46 kg), the quachtli (cotton mantle ≈ 65g), the jade bead (~5g), and the cacao bean (~1g).
The Codex Mendoza is an Aztec document compiled around 1541, shortly after the Spanish conquest, at the order of Viceroy Antonio de Mendoza. It contains three sections: a history of Aztec conquests, a record of tribute paid by each province, and a description of daily Aztec life. The tribute section (folio 17r–54v) lists goods owed by each of the 38 tribute provinces, making it the single most important source for understanding Aztec fiscal administration.
One standard load (carga) of cacao contained approximately 24,000 beans. This was a standardized Mesoamerican commercial unit. Some scholars use slightly different figures (20,000–28,000 beans per load), but 24,000 is the most widely cited estimate based on colonial-era documents and comparison with surviving measuring vessels.
The Aztecs used cacao beans and standardized cotton mantles (quachtli) as currency in marketplaces like the famous Tlatelolco market. Larger transactions used T-shaped copper axes (tepuztli) and quills filled with gold dust. Tribute goods often circulated back into the economy as wages, gifts to allies, or religious offerings — blurring the line between tax collection and monetary supply management.
The Aztec system was comparable in scale to the Egyptian grain tax system under the New Kingdom (roughly 10–20% of agricultural output) and more intensive than most European feudal arrangements of the same era. Unlike Roman tribute (primarily a cash tax after conquest), Aztec tribute remained in-kind, which required massive redistribution infrastructure and storage facilities in Tenochtitlan — some described by Spanish conquistadors as warehouses stretching entire city blocks.