# BC to AD Calculator - BC Year — BCE CE Historical Duration

> BCE CE Historical Duration (iPhone/iPad app by Seulki Eom.)

- Source: https://appshunter.io/ios/app/bc-to-ad-calculator-bc-year/id6746085711 (this page in markdown: same URL + `.md`)
- Developer: [Seulki Eom](https://appshunter.io/developer/1718927408)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 20 MB
- Languages: American English
- Released: 2025-05-21
- Data updated: 2026-08-23
- User reviews in markdown: https://appshunter.io/ios/app/bc-to-ad-calculator-bc-year/id6746085711/reviews.md

## What is BC to AD Calculator?

BC to AD Calculator: Accurate Historical Year & Duration Calculator

Struggling to calculate the exact number of years between BC (BCE) and AD (CE) dates?
Because there is no year zero in the Gregorian or Julian calendar systems (1 BC is immediately followed by 1 AD), simple subtraction results in a 1-year error. BC to AD Calculator accounts for this historical calendar rule (Duration = BC + AD - 1), providing exact, error-free year and duration calculations instantly.

How to Use
1. Calculate Duration Mode: Enter a BC year and an AD year to calculate the precise total elapsed years between the two historical points.
2. Calculate AD Year Mode: Enter a starting BC year and duration in years to calculate the target AD year.
3. Calculate BC Year Mode: Enter a target AD year and duration in years to calculate the preceding BC year.

Key Features
- No Year Zero Formula: Built-in algorithm handling the transition from 1 BC to 1 AD accurately without calculation errors.
- 3 Flexible Modes: Easily calculate duration, future AD years, or past BC years based on your input.
- Real-Time Live Calculation: Instant calculation results as you type without extra button taps.
- Large Number Formatting: Thousands separators for clear visibility when working with ancient historical dates.
- Clean & Intuitive Design: User-friendly interface designed for history students, researchers, and history enthusiasts.

Recommended For
- History students studying World History, Ancient History, and European History.
- Researchers, educators, and authors building historical timelines and chronology charts.
- Anyone reading historical books or watching documentaries who wants to verify accurate year gaps between BC and AD events.

Download BC to AD Calculator today to calculate exact historical years and duration effortlessly!


## Version history (last 3 releases)

### 1.0.3 — 2026-08-06

Stability improvements.

### 1.0.1 — 2025-12-14

Age Rating Update

### 1.0 — 2025-05-21

No release notes.

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All apps by Seulki Eom: https://appshunter.io/developer/1718927408

## Related topics

[bc to ad date converter](https://appshunter.io/ios/topics/bc-to-ad-date-converter)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*