Bragg's law relates wavelength, lattice-plane spacing, and diffraction angle using n * lambda = 2 * d * sin(theta).

Should I enter theta or two-theta?

Most XRD instruments report two-theta. Enter the two-theta peak position and the calculator divides it by 2 internally.

Which wavelength should I use?

Use the wavelength for the radiation source used in the measurement, such as Cu K-alpha at 1.5406 angstrom.

ToolsConductScience tool

XRDFree in-browser calculator

Bragg's Law XRD Calculator.

Calculate d-spacing from wavelength, diffraction order, and two-theta for XRD and crystallography workflows. For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

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Validated2026-05-24

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Load example Bragg's law data to see the full workflow

Bragg inputs

Wavelength

Wavelength unitTwo-theta

deg

Order

Results

d-spacing

2.0257 A

d-spacing

0.20257 nm

theta

22.35 deg

Methods note

Uses n * lambda = 2 * d * sin(theta), where theta is one half of the entered two-theta value.

Scope and limitations

For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

Results are deterministic calculations from the values entered here. Review units, assumptions, and measurement quality before using outputs in reports or protocols.

Method

Uses the tool-specific formulas and assumptions shown in the calculator output.

Validated

Last validated 2026-05-24. Calculations are designed for planning and documentation support; verify procurement decisions against manufacturer specifications or institutional SOPs.

How to cite

How to Cite

Bragg's Law XRD Calculator (1.2.0). ConductScience, Inc. 2026. Available at: https://conductscience.com/tools/braggs-law-xrd-calculator

For materials research, education, and protocol documentation only. Not a certified inspection, compliance, asset-integrity, or final acceptance tool.

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