Free Surveying Tools & Calculators

Professional-grade online tools for surveyors. No registration, no ads, completely free.

Coordinate Converter

Convert between Lat/Lon (WGS84), UTM, and ECEF coordinate systems.

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DMS to Decimal Converter

Convert between Degrees-Minutes-Seconds (DMS) and decimal degree format for latitude and longitude coordinates.

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Distance Calculator

Calculate the distance and bearing between two geographic points using Haversine or Vincenty formulas.

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Triangle Calculator (SSS)

Calculate all angles, area, perimeter, and heights of a triangle from its three sides.

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Back-Azimuth Calculator

Calculate the back-azimuth (reverse direction) from any forward azimuth.

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Horizontal Curve Calculator

Calculate arc length, tangent, chord, external, and middle ordinate of a circular horizontal curve.

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Vertical Curve Calculator

Calculate PVC, PVT, turning point, and elevations of a parabolic vertical curve from grades and length.

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Polygon Area Calculator

Calculate the area of any polygon from its vertex coordinates using the Shoelace formula.

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Stockpile Volume Calculator

Estimate stockpile volumes for cones, truncated cones, and triangular prisms using standard geometric formulas.

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Cut and Fill Calculator

Calculate net earthwork volume, shrinkage-adjusted quantities, and material balance for construction sites.

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Cross-slope / Superelevation Calculator

Calculate required cross-slope (superelevation) for road curves based on design speed, radius, and side friction (AASHTO method).

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Length Unit Converter

Convert length between meters, feet, yards, miles, chains, links, rods, fathoms and more.

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Area Unit Converter

Convert area between square meters, hectares, acres, square feet, square miles and more.

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Volume Unit Converter

Convert volume between cubic meters, liters, cubic feet, cubic yards, gallons and acre-feet.

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Pressure Unit Converter

Convert pressure between Pa, kPa, bar, atmospheres, PSI, mmHg and inHg. Useful for barometric corrections.

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Temperature Unit Converter

Convert temperature between Celsius, Fahrenheit, Kelvin, Rankine and Réaumur.

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Roof Pitch Calculator

Convert roof pitch between rise:run, percentage, and angle in degrees. Useful for surveying building facades and construction.

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Volume Calculator (Cross-Sections)

Calculate earthwork volumes using the average end-area method from cross-section data.

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GDOP / PDOP / HDOP Calculator

Convert GNSS dilution of precision values into expected horizontal, vertical, and 3D positioning uncertainty.

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NMEA 0183 GGA Parser

Decode GNSS NMEA GGA sentences into readable position, fix quality, satellite count and HDOP.

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GPS Time Converter

Convert between UTC, GPS week/second-of-week, Julian date, and Unix timestamp for satellite data processing.

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Level Height Difference Calculator

Calculate cumulative elevation changes from backsight/foresight readings in differential leveling surveys.

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Trigonometric Leveling Calculator

Compute height difference between two points from slope distance, vertical/zenith angle, and instrument heights.

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Reciprocal Leveling Calculator

Compute the true height difference between two points by averaging forward and backward leveling measurements, canceling curvature and refraction errors.

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Traverse Closure Calculator

Compute linear closure error, precision ratio, and classification for closed-loop or connecting traverses.

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Stationing Calculator

Convert between engineering stationing notation (e.g. 15+00.250) and decimal distances for roads, railways, and linear projects.

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Offset Calculator

Compute coordinates of a point offset perpendicularly from a centerline, given start point, bearing, distance along and offset distance.

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Concrete Volume Calculator

Calculate concrete volume for slabs, columns, footings, and cylindrical elements with wastage allowance and material estimates.

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Staking Calculator

Compute bearing and distance from a reference control point to a target point for total station or GNSS setout.

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Standard Deviation Calculator

Compute mean, standard deviation, variance, standard error and confidence intervals from repeated measurements.

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Rise / Run Calculator

Compute slope, gradient, and hypotenuse length from two point coordinates. Useful for ramps, roofs, and terrain analysis.

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Parcel Bearing & Area Calculator

Compute parcel area, perimeter, and closure from a sequence of bearings and distances. Standard for cadastral and boundary surveys.

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Closure Ratio Classifier

Compute the closure ratio (1:N) of a traverse or parcel from linear misclosure and perimeter, and classify by geodetic accuracy order.

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Grid Convergence Angle Calculator

Compute the convergence angle between true north and grid north at any location in a transverse Mercator projection (UTM, state plane).

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Map Scale Calculator

Convert between map distances, real-world distances, and map scale ratios (1:25000, 1:10000, etc.) in multiple units.

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Error Propagation Calculator

Combine individual measurement uncertainties (σ) using standard error propagation rules for sums, products, and weighted means.

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Satellite Visibility / Elevation Mask Calculator

Estimate the elevation angle blocked by an obstacle and recommend the GNSS cutoff angle for your site.

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RTK Accuracy Calculator

Estimate horizontal and vertical RTK positioning accuracy based on baseline length and manufacturer specifications.

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Angle Converter

Convert between degrees, radians, gradians (gon), turns, and DMS. Instant multi-unit conversion.

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Slope & Gradient Calculator

Calculate slope gradient from rise/run, percentage, degrees, or ratio. Instant conversion between all formats.

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Bearing & Azimuth Converter

Convert between surveyor bearings (N 45° E) and azimuths (0-360°). Includes compass direction and quadrant.

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