Radiocarbon Date Calibrator

Convert radiocarbon years BP to approximate calendar age with uncertainty ranges and reservoir correction.

Radiocarbon Age

yr BP

± Uncertainty

Reservoir Correction

Tab to move between fields

Calibrated Age (cal BP)

3,725 cal BP

Calendar Date

1775 BCE

Corrected ¹⁴C Age3,500 yr BP

1σ Range (older)3,769 cal BP

1σ Range (younger)3,681 cal BP

2σ Range (older)3,813 cal BP

2σ Range (younger)3,637 cal BP

Remaining ¹⁴C65.48%

How to Use This Calculator

Enter Radiocarbon Age, ± Uncertainty, and Reservoir Correction.
Review Calibrated Age (cal BP) and Calendar Date.
Use Corrected ¹⁴C Age (yr BP) and 1σ Range (older) (cal BP) to inform your decision.
Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Radiocarbon Age

Radiocarbon Age: Conventional radiocarbon age in years before present (1950).
± Uncertainty: Laboratory reported 1-sigma uncertainty.
Reservoir Correction: Marine or freshwater reservoir offset (ΔR). 0 for terrestrial samples.

Identify Input Parameters
Radiocarbon Age = 3500, ± Uncertainty = 40, Reservoir Correction = 0 = 3 input(s) provided
Calculate Calibrated Age
Calibrated Age
3725 = 3725
Calculate Calendar Date
Calendar Date
1775 BCE = 1775 BCE
Calculate Corrected ¹⁴C Age
Corrected ¹⁴C Age
3500 = 3500
Calculate 1σ Range
1σ Range
3769 = 3769