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// LithoLab · Geological Toolbox

Browser-Based
Geoscience Tools

Nine free calculators covering sedimentology, geochemistry, hydrogeology, petrophysics, stratigraphy, and planetary geology. Click any card to open the tool — no login, no download, runs entirely in your browser.

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Sedimentology Tool 01
Grain Size Classifier
Classify sediment grain size using the Wentworth Scale. Accepts input in millimetres, micrometres, or Φ (phi) units. Returns sediment class, depositional environment interpretation, and phi equivalent.
Wentworth Scale mm / μm / Φ Depositional Env.
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Geochemistry Tool 02
CIA Calculator
Calculate the Chemical Index of Alteration (CIA) from major oxide weight percentages. Quantifies the intensity of silicate chemical weathering with geological interpretation.
Al₂O₃ · CaO* · Na₂O · K₂O Weathering Intensity
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Geochemistry Tool 03
Geochemical Indices
Compute five major geochemical weathering and maturity indices simultaneously — CIA, PIA, CIW, ICV, and WIP — from a single major oxide dataset.
CIA PIA CIW ICV WIP
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Hydrogeology Tool 04
Darcy's Law Calculator
Solve for groundwater flow rate Q, hydraulic conductivity K, or hydraulic gradient i using Darcy's Law (Q = K × i × A). Includes rock-type conductivity reference.
Flow Rate Q Conductivity K Gradient i
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Petrophysics Tool 05
Porosity Calculator
Calculate porosity from bulk/grain density or void/total volume. Optional Kozeny-Carman permeability estimation. Includes rock-type porosity reference table.
Density Method Volume Method Kozeny-Carman
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Φ
Sedimentology Tool 06
Phi Scale Converter
Bidirectional conversion between millimetres and the phi (Φ) scale using Φ = −log₂(d mm). Includes a full Wentworth grain-size reference table.
mm → Φ Φ → mm Reference Table
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Petrophysics Tool 07
Rock Density Estimator
Calculate bulk density from direct mass/volume measurements or estimate from mineral volume fractions. Returns rock-type inference with geological context.
Mass / Volume Mineral Mix Rock Inference
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Stratigraphy Tool 08
Geologic Time Scale
Interactive reference for the International Chronostratigraphic Chart. Filter by eon, search by period or era, and view key events and typical rock associations for each interval.
Eon / Era / Period Key Events Typical Rocks
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Planetary Tool 09
Impact Crater Calculator
Estimate final crater diameter from impactor properties using Pi-group scaling relations (Schmidt & Housen 1987; Melosh 1989). Supports Earth, Mars, Moon, and Venus gravity fields.
Pi-Scaling Earth · Mars · Moon · Venus KE Estimate
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