Carbon Dating Calculator

A carbon dating calculator estimates the age of organic materials based on remaining carbon-14 content.

Radiocarbon dating — a method for determining the age of organic materials by measuring carbon-14 decay.

A radioactive isotope of carbon that decays at a known rate.

The time required for half of the radioactive atoms to decay — 5,730 years for C-14.

The rate of radioactive decay, measured in disintegrations per minute.

Activity per unit mass of carbon in the sample.

The fraction of atoms that decay per unit time.

Natural radiation present in the environment that can affect measurements.

Adjusting radiocarbon dates using tree-ring or other records to account for atmospheric C-14 variations.

Age calculated using the Libby half-life (5,568 years) before calibration.

Actual chronological age after calibration.

A technique that directly counts C-14 atoms for more precise dating.

The original half-life value used in radiocarbon dating: 5,568 years.

The more accurate half-life value: 5,730 years.

When materials absorb carbon from sources with different C-14 concentrations.

Enter remaining C-14 percentage or activity. Calculator shows estimated age.

Input C-14 measurement. Click "Calculate" for age estimate.

As percentage of original or as activity relative to modern standard.

Use calibration curves to convert radiocarbon years to calendar years.

Some calculators support other radiometric methods.

Enter measured C-14 content for age estimation.

Use appropriate isotope for the time range.

Organic materials like wood, bone, shell, or charcoal.

C-14 dating works best for materials up to 50,000 years old.

Adjust for known contamination effects.

Lab-specific corrections may apply.

Use appropriate reference standard (e.g., Oxalic Acid).

Enter measurement uncertainty for confidence intervals.

Consider archaeological context when interpreting results.

Calculate each separately and compare.

Provides absolute dating for archaeological and geological specimens.

The known decay rate allows age calculation from remaining C-14.

Atmospheric C-14 has varied over time; calibration corrects for this.

Even small contamination can significantly affect age estimates.

Different materials have different reliability for dating.

Must be subtracted from measured activity for accurate results.

Small errors in measurement translate to large errors in age.

Archaeological context helps validate dating results.

Multiple dates provide more reliable chronologies.

Understanding limits prevents misinterpretation.

Yes. Wood, bone, shell, charcoal, seeds, and textiles.

Yes. Up to approximately 50,000 years.

Yes. Any remaining percentage or activity level.

Yes. Different organic materials with appropriate corrections.

Yes. Various reference standards.

Yes. Archaeological specimens and sites.

Yes. Late Quaternary geological samples.

Yes. With appropriate lab-specific corrections.

Yes. Include measurement uncertainty.

Yes. Convert radiocarbon to calendar years.

Yes. Calibration curves differ by hemisphere.

Yes. With marine reservoir corrections.

Yes. With freshwater reservoir corrections.

Yes. Learn about radiocarbon dating methods.

Yes. Academic and scientific research applications.

Yes. Uses standard radiocarbon dating formulas.

Yes. Completely free with no registration.

Yes. All calculations in your browser.

Yes. Based on established nuclear physics.

Yes. Used by archaeologists and geologists.

Yes. Updated with current calibration curves.

Yes. Works on all devices.

Yes. Provides calculated age vs relative dating.

Yes. Educational tool for learning dating methods.

No. Actual dating requires laboratory measurement.

Radiocarbon years use measured C-14; calendar years are actual chronological age.

AMS counts atoms directly; conventional measures decay events.

Libby is 5,568 years; Cambridge is 5,730 years.

Dating calculates radiocarbon age; calibration converts to calendar years.

Absolute gives specific age; relative gives order of events.

C-14 for organic materials up to 50,000 years; others for different ranges.

Dating gives age; provenance gives origin.

Dating gives absolute age; typology gives relative age based on style.

Dating gives age; stratigraphy gives relative position.

Both are absolute methods; TL for ceramics, C-14 for organic materials.

When dating organic archaeological or geological specimens.

For materials between 300 and 50,000 years old.

Always — calibration provides more accurate calendar ages.

When sample may have been contaminated with modern carbon.

For important chronologies or when results are ambiguous.

For marine or freshwater samples.

For important specimens or research publications.

Always — context helps validate and interpret results.

When comparing dates or building chronologies.

When interpreting results for materials outside C-14 range.

Yes. Estimated age in years.

Some versions include calibration curves.

Yes. Confidence intervals for age estimates.

Yes. All calculations in your browser.

No. For privacy, results are not stored.

Yes. Libby and Cambridge half-life options.

Yes. Compatible with all modern browsers.

Yes. Various organic material types.

Some versions visualize C-14 decay.

Some versions include calibration curve references.

Cambridge (5,730 years) is more accurate; Libby (5,568) for historical comparisons.

Depends on location and time period — IntCal20 for Northern Hemisphere.

Accurate age calculation and calibration options.

C-14 for organic materials; others for different materials and time ranges.

Select well-preserved, uncontaminated materials in clear context.

Enter 50%. Result: approximately 5,730 years (one half-life).

Enter 25%. Result: approximately 11,460 years (two half-lives).

Enter 10%. Result: approximately 19,030 years.

Enter 1%. Result: approximately 38,060 years.

Enter measured C-14 content for age estimate.

With collagen preservation and contamination correction.

With marine reservoir correction if applicable.

Enter measured C-14 content.

Small samples may require AMS dating.

With appropriate contamination assessment.

t = -8267 × ln(N/N0), where N/N0 is fraction of C-14 remaining.

N = N0 × e^(-λt), where λ is the decay constant.

λ = ln(2) / t½, where t½ is the half-life.

Compare measured age to calibration curve for calendar age.

Useful only up to ~50,000 years; requires organic material.

Ensure C-14 measurement is entered correctly.

Different calibration curves or half-lives may be used.

C-14 measurement must be positive.

Different calculators may use different formulas.

For important specimens or research applications.

The Carbon Dating Calculator uses standard mathematical formulas validated against authoritative references. The specific formula is displayed in the calculator interface with a detailed explanation of each variable.

Each calculator includes a step-by-step worked example showing exactly how the formula is applied. You can follow these steps with pen and paper to verify any result.

The Carbon Dating Calculator accepts numeric inputs including integers and decimals. Invalid inputs (letters, special characters) are rejected with clear error messages.