免费测量工具和计算器

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精度计算器

基于基线长度和制造商规格估算RTK定位精度（水平和竖直方向）

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角度转换器

在度、弧度、梯度 (gon)、转和 DMS 之间转换。

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坡度与梯度计算器

从高度/水平、百分比、度数或比率计算坡度。

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方位角与象限角转换器

在测量象限角（N 45° E）和方位角（0-360°）之间转换。

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