Historical English measures
Convert rods, chains, furlongs, and other English lengths using a modern SI yard reference.
Your inputs
Enter an amount and select the source and target units. Results update as you edit.
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How it works
- Converted estimate = × Conversion factor
- Yard = 0.9144 m; Rod / pole / perch = 5.5 × Yard
- Chain = 22 × Yard; Furlong = 220 × Yard; Mile = 1,760 × Yard
- Worked example: Convert ten chains using 22 yards per chain and the modern 0.9144 m yard. Ten chains also equal one furlong in this normalized system.
- 10 × 22 × 0.9144 = 201.168 m.
Input and formula key
Your result
Complete the inputs to see your result.
Assumptions and limitations
Historical English ratios are normalized to the 1,963 SI yard (0.9144 m). This does not reconstruct medieval or pre-1963 physical standards.
Sources
- UK Weights and Measures Act 1878 — traditional ratios Sources reviewed: 2026-10-05
- UK Weights and Measures Act 1963 — modern SI yard reference Sources reviewed: 2026-10-05
- NIST — Revised imperial length conversion factors Sources reviewed: 2026-10-05
