BC ⇄ AD Year Difference
Compute the time between a BC/BCE year and an AD/CE year. Formula: D = BC + AD − 1 (no year 0).
Inputs
(Label only; values unchanged)
BC/BCE year must be ≥ 1.
(Label only; values unchanged)
AD/CE year must be ≥ 1.
Computed as
D = BC + AD − 1 (there’s no year 0). Enter here (with any other field) to solve the third.Difference must be ≥ 0.
Quick summary
Inputs
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Time between
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Also equals
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Step-by-step derivation
Formula (no year 0): D = BC + AD − 1
Substitute: D = …
Solve: …
Actions
Reference table & sources
Notes
- There is no year 0. 1 BC is followed immediately by AD 1.
- Formula:
D = BC + AD − 1, where D counts full years between the given years. - Naming equivalencies: BC ≡ BCE; AD ≡ CE (labels only; values unchanged).