Plan historically accurate ancient Greek trireme expeditions — speed, range, crew provisions & more
The Athenian trieres (trireme) was the dominant warship of the classical Mediterranean from roughly 500–322 BCE. Measuring approximately 37 metres long and 5.5 metres wide, it carried 170 oarsmen arranged in three overlapping banks, plus ~30 marines and officers — a total crew of ~200 men. Ancient sources (Thucydides, Herodotus, Xenophon) record sustained cruising speeds of 6–8 knots under oar, with short sprints reaching 10–12 knots. The 1987 reconstruction Olympias achieved 9.0 knots under 170 oarsmen, confirming ancient accounts. Triremes typically hugged coastlines, covering 120–200 km per day, camping ashore each night as no cooking facilities existed aboard.
Enter your departure and destination distance (or choose a historical route preset), select a rowing mode, adjust daily rowing and sailing hours with the sliders, and click Calculate Voyage. The tool outputs total voyage days, daily distance covered, crew provisions required, a day-by-day log, and historical risk factors for your season of travel.
Understanding trireme logistics reveals why Athenian naval power was both formidable and fragile. The fleet that won at Salamis and Mycale had to solve an immense logistical puzzle: 200 men burning ~3,000 calories each per day, with no cooking facilities aboard, requiring food and fresh water stops every 24–36 hours. Thucydides mentions the disastrous Sicilian Expedition (415–413 BCE) partly foundered on these exact supply problems over a 1,480 km voyage. Modern operational analysis of ancient triremes — driven largely by the Olympias project — shows that an 8-knot sustained battle speed for more than 30 minutes was physiologically impossible without rotating rowers, explaining the three-bank design. By exploring the numbers here you begin to understand why Athens needed over 130 friendly ports around the Aegean to maintain her empire.
Speed conversions use 1 knot = 1.852 km/h. Daily distance = (rowing hours × rowing speed km/h) + (sailing hours × sailing speed km/h), where sailing speed is approximated at 5 knots (9.26 km/h) for a trireme running before a moderate breeze. Voyage days = total distance ÷ daily distance, rounded up. Provisions use the attested ancient Greek military ration: ~1 kg grain (sitarchia) + ~0.5 L olive oil + ~0.5 L wine per man per day, carried in amphorae aboard or sourced ashore. Oar strokes use the experimental rate of ~40 strokes/minute derived from the Olympias trials.
Formula: Days = ⌈Distance(km) ÷ ((RowHours × SpeedKmh) + (SailHours × 9.26))⌉
Ancient sources including Thucydides record triremes crossing the Aegean at average speeds consistent with 6–8 knots under continuous oar. The 1987 reconstruction Olympias achieved a peak of 9.0 knots in trials. Battle sprint speeds of up to 12 knots were claimed but are archaeologically debated — most scholars accept 7–8 knots as a realistic sustained battle pace for a well-trained crew.
A full Athenian trireme carried exactly 170 oarsmen arranged in three banks: 62 thranites (top), 54 zygites (middle), and 54 thalamites (bottom). They were supplemented by ~14 sailors, 10 marines (epibatai), officers, and a flute-player (auletes) who kept time — totalling about 200 men.
Triremes could and did make open-sea crossings — Herodotus records the Persian fleet crossing from Cilicia to Rhodes. However, their shallow draught (~1 m) and lack of storage made coasting preferable for most voyages. The need for nightly beaching and daily fresh water resupply meant triremes almost never spent two consecutive nights at sea on campaign.
Each trireme cost roughly 1 talent (26 kg silver, ~6,000 drachmas) to build and about 1 talent per month to operate at full pay. Athens' fleet of 200 triremes cost approximately 200 talents per month — equivalent to the total annual tribute income from her entire empire. The financial strain eventually helped doom the Sicilian Expedition.