Free Geology Calculators & Earth Science Tools

Choose a free geology calculator

• Strike and dip calculator — Convert right-hand-rule strike and dip, draw the plane, and calculate apparent dip along a section.
• Stereonet plotter for planes and poles — Paste up to 250 RHR strike and dip measurements and plot planes, poles, or both on a lower-hemisphere equal-area net.
• True thickness calculator — Correct an apparent drill, core, outcrop, or section interval using intersection angle or full plane and line orientations.
• Slope and gradient calculator — Convert rise and horizontal run, percent grade, degrees, and 1:N ratio with a profile and distance check.
• Latitude longitude coordinate converter — Convert one coordinate pair between decimal degrees, DMS, and degrees decimal minutes with datum safeguards.
• WGS 84 UTM coordinate converter — Convert latitude and longitude to UTM easting and northing, or reverse UTM coordinates, with automatic zones.
• Map scale and ground distance calculator — Convert map and ground distance or derive a 1:N representative fraction using metric or imperial units.
• Distance between coordinates calculator — Calculate great-circle distance, initial and final bearing, and midpoint between two latitude/longitude points.
• Core recovery and RQD calculator — Calculate drill-core recovery and rock quality designation for one run with unit-aware threshold guidance.
• Rock Mass Rating (RMR89) calculator — Calculate basic and orientation-adjusted RMR89 from UCS, RQD, discontinuity spacing and condition, groundwater, and application context.
• Point load strength index Is(50) calculator — Calculate equivalent diameter, uncorrected point-load index, the 50 mm size correction, and the applicable RMR89 point-load band.
• Rock UCS and uniaxial compressive strength calculator — Calculate cylindrical intact-rock UCS from peak axial load and initial area with geometry, unit conversion, and RMR89 bands.
• Q-system rock mass calculator — Calculate the NGI Q value from RQD, Jn, Jr, Ja, Jw, and SRF with all three stability quotients and the rock-mass quality class.
• Ore grade unit converter — Convert assay mass fractions between ppm, ppb, percent, g/t, mg/kg, kg/t, and troy ounces per short ton.
• Contained metal calculator — Calculate arithmetic contained metal from matched tonnage and grade with metric, troy-ounce, and pound outputs.
• Mining cut-off grade and break-even grade calculator — Calculate a simplified single-product break-even head grade from a defined ore cost, metal price, recovery, and payability.
• Mine dilution and ore loss calculator — Calculate recovered ore, ore loss, added diluent, final mined tonnage, and mass-weighted diluted grade with an explicit dilution denominator.
• Mining stripping ratio calculator — Calculate waste-to-ore ratio from mass or bank volume, derive waste from total material, and optionally adjust for density.
• Weighted average drill intercept grade calculator — Length-weight assay intervals with gap and overlap checks, contribution weights, and reporting limits.
• Drill hole desurvey calculator — Calculate a minimum-curvature borehole trace, toe coordinates, TVD, displacement, dogleg, and dogleg severity.
• Specific gravity calculator — Calculate specimen specific gravity from suspended-water weights or water displacement.
• Rock weight calculator and density chart — Estimate boulder or rock mass and compare illustrative rock densities in metric and imperial units.
• Porosity and void ratio calculator — Calculate rock, soil, or sediment porosity and void ratio from density, volumes, porosity, or void ratio.
• Darcy's law groundwater flow calculator — Calculate hydraulic gradient, Darcy flux, groundwater discharge, and optional average linear pore-water velocity with explicit units.
• Aquifer transmissivity calculator — Solve T = Kb for transmissivity, representative horizontal hydraulic conductivity, or contributing saturated thickness with mixed units.
• Hydraulic conductivity and permeameter calculator — Calculate saturated hydraulic conductivity from constant-head or falling-head laboratory measurements with transparent equations and test limits.
• Lugeon and packer test calculator — Normalize stabilized rock-mass water take to one MPa per metre with effective-pressure safeguards and field-test limits.
• Theis equation well drawdown calculator — Calculate idealized confined-aquifer drawdown using the full Theis well function, metric or U.S. customary units, and a small-u check.
• Sediment grain size and phi calculator — Convert millimetres, micrometres, and phi, then classify a particle on the Udden-Wentworth scale.
• Sieve analysis and grain size distribution calculator — Paste percent-passing or mass-retained data, plot a semi-log gradation curve, and calculate bounded D10, D30, D60, Cu, and Cc.
• USCS soil classification calculator — Assign a transparent inorganic USCS group symbol from No. 4 and No. 200 passing, Atterberg limits, and bounded D-values.
• USDA soil texture triangle calculator — Enter sand, silt, and clay percentages, find the USDA texture class, and plot the composition.
• Atterberg limits and plasticity index calculator — Calculate PI, optional liquidity and consistency indices, and a conservative USCS plasticity-chart position from valid laboratory limits.
• Soil dry density and relative compaction calculator — Convert moist density to dry density, calculate percent compaction against an entered laboratory maximum, and evaluate an explicit project target.
• Earthquake magnitude and energy calculator — Compare moment magnitudes, approximate radiated energy and seismic moment, and understand the logarithmic scale.
• Radiometric dating and half-life calculator — Explore age, half-life, parent remaining, and corrected radiogenic daughter-to-parent ratios with official sources and clear limits.
• Geothermal gradient and formation temperature calculator — Solve target temperature, reference temperature, average geothermal gradient, or true vertical depth with mixed units and explicit model limits.
• Geologic time scale and age calculator — Look up an age from the present to Earth's formation and compare current ICS eons, eras, periods, and epochs.

Common questions

Are GeoMiner geology calculators free?

Yes. Every calculator on this page is free to use, requires no payment, and can be opened without signing in.

Do GeoMiner calculators upload my measurements?

The values entered into these calculators stay in the current browser. GeoMiner measures only bounded interaction categories and does not retain raw measurements or search text from this hub.

Can these calculators replace professional geological or engineering review?

No. They support arithmetic, conversion, teaching, and first-pass checks. Qualified review and fit-for-purpose workflows still govern consequential decisions.

How can I check a result?

Review the method, assumptions, units, limitations, and sources on the calculator page. Preserve original measurements and independently repeat consequential calculations.