{ "schema_version": 1, "generated": "2026-10-19", "source_sha256": "55b8726a56872de2912859b405d84599ff48bb42018169c1f94bd21086565a77", "unit_count": 42, "units": [ { "id": "metre", "name": "metre", "symbol": "m", "system": "Modern", "region": "International", "period_start": 1791, "period_end": 2026, "period_label": "SI modern standard", "metres": 1.0, "uncertainty_m": 0.0, "basis": "defined", "source_name": "BIPM SI Brochure", "source_url": "https://www.bipm.org/en/publications/si-brochure", "confidence": "defined", "notes": "Exact SI unit" }, { "id": "centimetre", "name": "centimetre", "symbol": "cm", "system": "Modern", "region": "International", "period_start": 1791, "period_end": 2026, "period_label": "SI modern standard", "metres": 0.01, "uncertainty_m": 0.0, "basis": "defined", "source_name": "BIPM SI Brochure", "source_url": "https://www.bipm.org/en/publications/si-brochure", "confidence": "defined", "notes": "One hundredth of a metre" }, { "id": "millimetre", "name": "millimetre", "symbol": "mm", "system": "Modern", "region": "International", "period_start": 1791, "period_end": 2026, "period_label": "SI modern standard", "metres": 0.001, "uncertainty_m": 0.0, "basis": "defined", "source_name": "BIPM SI Brochure", "source_url": "https://www.bipm.org/en/publications/si-brochure", "confidence": "defined", "notes": "One thousandth of a metre" }, { "id": "inch", "name": "inch", "symbol": "in", "system": "Imperial", "region": "International", "period_start": 1959, "period_end": 2026, "period_label": "International yard agreement", "metres": 0.0254, "uncertainty_m": 0.0, "basis": "defined", "source_name": "NIST Handbook 44 Appendix C", "source_url": "https://www.nist.gov/pml/owm/si-units-length", "confidence": "defined", "notes": "Exact international inch" }, { "id": "foot", "name": "international foot", "symbol": "ft", "system": "Imperial", "region": "International", "period_start": 1959, "period_end": 2026, "period_label": "International yard agreement", "metres": 0.3048, "uncertainty_m": 0.0, "basis": "defined", "source_name": "NIST Handbook 44 Appendix C", "source_url": "https://www.nist.gov/pml/owm/si-units-length", "confidence": "defined", "notes": "Exact international foot" }, { "id": "yard", "name": "yard", "symbol": "yd", "system": "Imperial", "region": "International", "period_start": 1959, "period_end": 2026, "period_label": "International yard agreement", "metres": 0.9144, "uncertainty_m": 0.0, "basis": "defined", "source_name": "NIST Handbook 44 Appendix C", "source_url": "https://www.nist.gov/pml/owm/si-units-length", "confidence": "defined", "notes": "Exact international yard" }, { "id": "mile", "name": "mile", "symbol": "mi", "system": "Imperial", "region": "International", "period_start": 1959, "period_end": 2026, "period_label": "International yard agreement", "metres": 1609.344, "uncertainty_m": 0.0, "basis": "defined", "source_name": "NIST Handbook 44 Appendix C", "source_url": "https://www.nist.gov/pml/owm/si-units-length", "confidence": "defined", "notes": "Exact international mile" }, { "id": "egypt-royal-cubit-giza", "name": "Egyptian royal cubit (Giza)", "symbol": "rc", "system": "Egyptian", "region": "Giza Egypt", "period_start": -2580, "period_end": -2560, "period_label": "Fourth Dynasty around 2570 BCE", "metres": 0.523748, "uncertainty_m": 0.0003, "basis": "survey-inferred", "source_name": "Petrie The Pyramids and Temples of Gizeh", "source_url": "https://petrieproject.com/book/the-pyramids-and-temples-of-gizeh", "confidence": "high", "notes": "Representative 20.62 inch value inferred from monument dimensions" }, { "id": "egypt-royal-cubit-new-kingdom", "name": "Egyptian royal cubit (New Kingdom rod)", "symbol": "rc", "system": "Egyptian", "region": "Egypt", "period_start": -1550, "period_end": -1070, "period_label": "New Kingdom around 1550 to 1070 BCE", "metres": 0.525, "uncertainty_m": 0.001, "basis": "artefact-measured", "source_name": "British Museum EA23078", "source_url": "https://www.britishmuseum.org/collection/object/Y_EA23078", "confidence": "high", "notes": "Surviving seven-palm wooden rod measured at 52.50 cm" }, { "id": "egypt-short-cubit", "name": "Egyptian short cubit", "symbol": "cubit", "system": "Egyptian", "region": "Egypt", "period_start": -2000, "period_end": -300, "period_label": "Middle to Late Period representative", "metres": 0.448927, "uncertainty_m": 0.0015, "basis": "derived-from-royal", "source_name": "Digital Egypt and metrological literature", "source_url": "https://www.ucl.ac.uk/museums-static/digitalegypt/", "confidence": "medium", "notes": "Representative six-palm cubit derived from the seven-palm Giza standard" }, { "id": "egypt-palm", "name": "Egyptian palm", "symbol": "palm", "system": "Egyptian", "region": "Giza Egypt", "period_start": -2580, "period_end": -2560, "period_label": "Fourth Dynasty around 2570 BCE", "metres": 0.0748211, "uncertainty_m": 5e-05, "basis": "derived-from-royal", "source_name": "British Museum EA23078", "source_url": "https://www.britishmuseum.org/collection/object/Y_EA23078", "confidence": "high", "notes": "One seventh of the selected Giza royal cubit" }, { "id": "egypt-digit", "name": "Egyptian digit", "symbol": "digit", "system": "Egyptian", "region": "Giza Egypt", "period_start": -2580, "period_end": -2560, "period_label": "Fourth Dynasty around 2570 BCE", "metres": 0.0187053, "uncertainty_m": 2e-05, "basis": "derived-from-royal", "source_name": "Petrie The Pyramids and Temples of Gizeh", "source_url": "https://petrieproject.com/book/the-pyramids-and-temples-of-gizeh", "confidence": "high", "notes": "One twenty-eighth of the selected Giza royal cubit" }, { "id": "egypt-khet", "name": "Egyptian khet", "symbol": "khet", "system": "Egyptian", "region": "Egypt", "period_start": -2000, "period_end": -300, "period_label": "Middle to Late Period representative", "metres": 52.3748, "uncertainty_m": 0.03, "basis": "derived-from-royal", "source_name": "BIPM historical overview", "source_url": "https://www.govinfo.gov/content/pkg/GOVPUB-C13-d7a59c174a3b5aab60e6a2d262a5e88f/pdf/GOVPUB-C13-d7a59c174a3b5aab60e6a2d262a5e88f.pdf", "confidence": "medium", "notes": "One hundred royal cubits using the selected Giza standard" }, { "id": "roman-pes", "name": "Roman pes", "symbol": "pes", "system": "Roman", "region": "Roman Empire", "period_start": -100, "period_end": 300, "period_label": "Late Republic to Imperial representative", "metres": 0.296, "uncertainty_m": 0.001, "basis": "artefact-and-architecture", "source_name": "Smith Dictionary Mensura", "source_url": "https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0063%3Aentry%3Dmensura-cn", "confidence": "high", "notes": "Representative value; surviving standards and buildings vary" }, { "id": "roman-digitus", "name": "Roman digit", "symbol": "digitus", "system": "Roman", "region": "Roman Empire", "period_start": -100, "period_end": 300, "period_label": "Late Republic to Imperial representative", "metres": 0.0185, "uncertainty_m": 6.3e-05, "basis": "derived-from-pes", "source_name": "Smith Dictionary Pes", "source_url": "https://penelope.uchicago.edu/Thayer/E/Roman/Texts/secondary/SMIGRA%2A/Pes.html", "confidence": "high", "notes": "One sixteenth of the representative pes" }, { "id": "roman-uncia", "name": "Roman uncia", "symbol": "uncia", "system": "Roman", "region": "Roman Empire", "period_start": -100, "period_end": 300, "period_label": "Late Republic to Imperial representative", "metres": 0.0246667, "uncertainty_m": 8.3e-05, "basis": "derived-from-pes", "source_name": "Smith Dictionary Pes", "source_url": "https://penelope.uchicago.edu/Thayer/E/Roman/Texts/secondary/SMIGRA%2A/Pes.html", "confidence": "high", "notes": "One twelfth of the representative pes" }, { "id": "roman-palmus", "name": "Roman palmus", "symbol": "palmus", "system": "Roman", "region": "Roman Empire", "period_start": -100, "period_end": 300, "period_label": "Late Republic to Imperial representative", "metres": 0.074, "uncertainty_m": 0.00025, "basis": "derived-from-pes", "source_name": "Smith Dictionary Pes", "source_url": "https://penelope.uchicago.edu/Thayer/E/Roman/Texts/secondary/SMIGRA%2A/Pes.html", "confidence": "high", "notes": "Four Roman digits" }, { "id": "roman-cubitus", "name": "Roman cubitus", "symbol": "cubitus", "system": "Roman", "region": "Roman Empire", "period_start": -100, "period_end": 300, "period_label": "Late Republic to Imperial representative", "metres": 0.444, "uncertainty_m": 0.0015, "basis": "derived-from-pes", "source_name": "Smith Dictionary Mensura", "source_url": "https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0063%3Aentry%3Dmensura-cn", "confidence": "medium", "notes": "One and one-half Roman feet" }, { "id": "roman-passus", "name": "Roman passus", "symbol": "passus", "system": "Roman", "region": "Roman Empire", "period_start": -100, "period_end": 300, "period_label": "Late Republic to Imperial representative", "metres": 1.48, "uncertainty_m": 0.005, "basis": "derived-from-pes", "source_name": "Smith Dictionary Mensura", "source_url": "https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0063%3Aentry%3Dmensura-cn", "confidence": "high", "notes": "Five Roman feet; a double pace" }, { "id": "roman-mille-passus", "name": "Roman mile", "symbol": "mille passus", "system": "Roman", "region": "Roman Empire", "period_start": -100, "period_end": 300, "period_label": "Late Republic to Imperial representative", "metres": 1480.0, "uncertainty_m": 5.0, "basis": "derived-from-pes", "source_name": "Smith Dictionary Mensura", "source_url": "https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0063%3Aentry%3Dmensura-cn", "confidence": "high", "notes": "One thousand passus" }, { "id": "greek-attic-pous", "name": "Attic pous", "symbol": "pous", "system": "Greek", "region": "Attica", "period_start": -500, "period_end": -100, "period_label": "Classical to Hellenistic representative", "metres": 0.2957, "uncertainty_m": 0.001, "basis": "architecture-inferred", "source_name": "Smith Dictionary Mensura", "source_url": "https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0063%3Aentry%3Dmensura-cn", "confidence": "medium", "notes": "Historical reconstructions differ by monument and method" }, { "id": "greek-attic-stadion", "name": "Attic stadion", "symbol": "stadion", "system": "Greek", "region": "Attica", "period_start": -500, "period_end": -100, "period_label": "Classical to Hellenistic representative", "metres": 177.42, "uncertainty_m": 0.6, "basis": "derived-from-pous", "source_name": "Archive for History of Exact Sciences 2025", "source_url": "https://doi.org/10.1007/s00407-024-00338-0", "confidence": "medium", "notes": "Six hundred selected Attic feet; itinerary evidence clusters near 177 m" }, { "id": "greek-olympic-pous", "name": "Olympic pous", "symbol": "pous", "system": "Greek", "region": "Olympia", "period_start": -700, "period_end": 300, "period_label": "Olympia working model; broad historical scope", "metres": 0.3205, "uncertainty_m": 0.0015, "basis": "stadium-survey", "source_name": "Penrose 1888 p. 123; declared rounded model", "source_url": "https://digi.ub.uni-heidelberg.de/diglit/penrose1888/0136", "confidence": "medium", "notes": "Rounded working factor from Penrose’s reported 192.27 m course and proposed 600-foot count; indicative allowance selected by this site, not a source survey error; period range is catalogue scope, not continuous attestation." }, { "id": "greek-olympic-stadion", "name": "Olympic stadion", "symbol": "stadion", "system": "Greek", "region": "Olympia", "period_start": -700, "period_end": 300, "period_label": "Olympia working model; broad historical scope", "metres": 192.3, "uncertainty_m": 0.9, "basis": "derived-from-pous", "source_name": "Penrose 1888 p. 123; declared rounded model", "source_url": "https://digi.ub.uni-heidelberg.de/diglit/penrose1888/0136", "confidence": "medium", "notes": "Six hundred selected 0.3205 m feet; the ±0.9 m allowance propagates the site-selected foot allowance, not a source survey error; period range is catalogue scope." }, { "id": "greek-aeginetan-pous", "name": "Aeginetan pous", "symbol": "pous", "system": "Greek", "region": "Aegina", "period_start": -600, "period_end": -300, "period_label": "Archaic to Classical representative", "metres": 0.333, "uncertainty_m": 0.002, "basis": "temple-architecture", "source_name": "Smith Dictionary Mensura", "source_url": "https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0063%3Aentry%3Dmensura-cn", "confidence": "medium", "notes": "Value inferred from temple measurements" }, { "id": "greek-aeginetan-stadion", "name": "Aeginetan stadion", "symbol": "stadion", "system": "Greek", "region": "Aegina", "period_start": -600, "period_end": -300, "period_label": "Archaic to Classical representative", "metres": 199.8, "uncertainty_m": 1.2, "basis": "derived-from-pous", "source_name": "Smith Dictionary Mensura", "source_url": "https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0063%3Aentry%3Dmensura-cn", "confidence": "medium", "notes": "Six hundred selected Aeginetan feet" }, { "id": "greek-philetaeric-pous", "name": "Philetaeric pous", "symbol": "pous", "system": "Greek", "region": "Pergamon", "period_start": -280, "period_end": -100, "period_label": "Hellenistic representative", "metres": 0.33, "uncertainty_m": 0.002, "basis": "architecture-inferred", "source_name": "Smith Dictionary Mensura", "source_url": "https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.04.0063%3Aentry%3Dmensura-cn", "confidence": "medium", "notes": "Associated with Pergamon; reconstructions vary" }, { "id": "mesopotamian-nippur-cubit", "name": "Nippur cubit", "symbol": "kush", "system": "Mesopotamian", "region": "Nippur", "period_start": -2650, "period_end": -2000, "period_label": "Early Dynastic to Ur III representative", "metres": 0.5185, "uncertainty_m": 0.0015, "basis": "artefact-measured", "source_name": "Stone 2014 Cubit history", "source_url": "https://doi.org/10.1155/2014/489757", "confidence": "medium", "notes": "Representative reconstruction associated with the Nippur measure" }, { "id": "mesopotamian-digit", "name": "Mesopotamian digit", "symbol": "shu-si", "system": "Mesopotamian", "region": "Southern Mesopotamia", "period_start": -2000, "period_end": -1600, "period_label": "Old Babylonian representative", "metres": 0.0172833, "uncertainty_m": 8e-05, "basis": "derived-from-cubit", "source_name": "Stone 2014 Cubit history", "source_url": "https://doi.org/10.1155/2014/489757", "confidence": "medium", "notes": "One thirtieth of the selected Nippur cubit" }, { "id": "mesopotamian-nindan", "name": "Mesopotamian nindan", "symbol": "nindan", "system": "Mesopotamian", "region": "Southern Mesopotamia", "period_start": -2650, "period_end": -1600, "period_label": "Early Dynastic to Old Babylonian representative", "metres": 3.111, "uncertainty_m": 0.009, "basis": "derived-from-cubit", "source_name": "Stone 2014 Cubit history", "source_url": "https://doi.org/10.1155/2014/489757", "confidence": "medium", "notes": "Six selected Nippur cubits" }, { "id": "khmer-hat-angkor", "name": "Khmer hat (Angkor Wat reconstruction)", "symbol": "hat", "system": "Khmer", "region": "Angkor Cambodia", "period_start": 1113, "period_end": 1150, "period_label": "Reign of Suryavarman II in the early 12th century CE", "metres": 0.43545, "uncertainty_m": 0.05, "basis": "architecture-inferred", "source_name": "Buildings 2025 Angkor Wat geometric planning review", "source_url": "https://doi.org/10.3390/buildings15081210", "confidence": "low", "notes": "Mannikka trial-derived value from architectural axes; no single inscriptionally fixed Angkor standard is established" }, { "id": "megalithic-yard-thom", "name": "Megalithic yard (Thom hypothesis)", "symbol": "MY", "system": "Prehistoric hypothesis", "region": "Britain and Brittany", "period_start": -4000, "period_end": -1600, "period_label": "Neolithic and Early Bronze Age hypothesis", "metres": 0.829, "uncertainty_m": 0.03, "basis": "statistical-hypothesis", "source_name": "Thom et al. 1974 Stonehenge; Porteous 1973 critique", "source_url": "https://ui.adsabs.harvard.edu/abs/1974JHA.....5...71T/abstract", "confidence": "low", "notes": "Site-rounded proposed quantum from monument surveys; no attested shared prehistoric standard. The ±0.03m allowance and low label are site policy, not a survey error or statistical probability." }, { "id": "egypt-hand", "name": "Egyptian hand", "symbol": "hand", "system": "Egyptian", "metres": 0.09352650000000001, "uncertainty_m": 0.0001, "period_label": "Pharaonic representative", "region": "Egypt", "source_name": "UCL Digital Egypt, length", "source_url": "https://www.ucl.ac.uk/museums-static/digitalegypt/weights/lenght.html", "basis": "five-digits", "confidence": "medium" }, { "id": "egypt-fist", "name": "Egyptian fist", "symbol": "fist", "system": "Egyptian", "metres": 0.1122318, "uncertainty_m": 0.00012000000000000002, "period_label": "Pharaonic representative", "region": "Egypt", "source_name": "UCL Digital Egypt, length", "source_url": "https://www.ucl.ac.uk/museums-static/digitalegypt/weights/lenght.html", "basis": "six-digits", "confidence": "medium" }, { "id": "egypt-double-handbreadth", "name": "Egyptian double handbreadth", "symbol": "2 hand", "system": "Egyptian", "metres": 0.1496424, "uncertainty_m": 0.00016, "period_label": "Pharaonic representative", "region": "Egypt", "source_name": "UCL Digital Egypt, length", "source_url": "https://www.ucl.ac.uk/museums-static/digitalegypt/weights/lenght.html", "basis": "eight-digits", "confidence": "medium" }, { "id": "egypt-small-span", "name": "Egyptian small span", "symbol": "span", "system": "Egyptian", "metres": 0.2244636, "uncertainty_m": 0.00024000000000000003, "period_label": "Pharaonic representative", "region": "Egypt", "source_name": "UCL Digital Egypt, length", "source_url": "https://www.ucl.ac.uk/museums-static/digitalegypt/weights/lenght.html", "basis": "twelve-digits", "confidence": "medium" }, { "id": "egypt-great-span", "name": "Egyptian great span", "symbol": "great span", "system": "Egyptian", "metres": 0.2618742, "uncertainty_m": 0.00028000000000000003, "period_label": "Pharaonic representative", "region": "Egypt", "source_name": "UCL Digital Egypt, length", "source_url": "https://www.ucl.ac.uk/museums-static/digitalegypt/weights/lenght.html", "basis": "fourteen-digits", "confidence": "medium" }, { "id": "egypt-foot", "name": "Egyptian foot", "symbol": "foot", "system": "Egyptian", "metres": 0.2992848, "uncertainty_m": 0.00032, "period_label": "Pharaonic representative", "region": "Egypt", "source_name": "UCL Digital Egypt, length", "source_url": "https://www.ucl.ac.uk/museums-static/digitalegypt/weights/lenght.html", "basis": "sixteen-digits", "confidence": "medium" }, { "id": "egypt-remen", "name": "Egyptian remen", "symbol": "remen", "system": "Egyptian", "metres": 0.37410600000000005, "uncertainty_m": 0.0004, "period_label": "Pharaonic representative", "region": "Egypt", "source_name": "UCL Digital Egypt, length", "source_url": "https://www.ucl.ac.uk/museums-static/digitalegypt/weights/lenght.html", "basis": "twenty-digits", "confidence": "medium" }, { "id": "egypt-pole", "name": "Egyptian pole", "symbol": "pole", "system": "Egyptian", "metres": 0.5985696, "uncertainty_m": 0.00064, "period_label": "Pharaonic representative", "region": "Egypt", "source_name": "UCL Digital Egypt, length", "source_url": "https://www.ucl.ac.uk/museums-static/digitalegypt/weights/lenght.html", "basis": "thirty-two-digits", "confidence": "medium" }, { "id": "egypt-reed", "name": "Egyptian reed", "symbol": "reed", "system": "Egyptian", "metres": 1.0474968, "uncertainty_m": 0.0011200000000000001, "period_label": "Pharaonic representative", "region": "Egypt", "source_name": "UCL Digital Egypt, length", "source_url": "https://www.ucl.ac.uk/museums-static/digitalegypt/weights/lenght.html", "basis": "two-royal-cubits", "confidence": "medium" }, { "id": "egypt-iteru", "name": "Egyptian iteru", "symbol": "iteru", "system": "Egyptian", "metres": 10474.968, "uncertainty_m": 11.200000000000001, "period_label": "Pharaonic representative", "region": "Egypt", "source_name": "UCL Digital Egypt, length", "source_url": 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