Geography Calculators
Last updated: September 2026
Time Zone Converter Calculator
Converts a clock time from one UTC offset to another, with optional daylight saving adjustment.
Population Density Calculator
Compute population density β people per unit area β from total population and area.
Coordinate Format Converter
Convert a decimal degree coordinate into degrees, minutes, and seconds (DMS) format.
Climate Zone Calculator
Classify a location into a broad climate zone using its average annual temperature and total annual rainfall.
Elevation Grade Calculator
Compute the steepness of a slope as a grade percentage, an angle in degrees, or a rise/run ratio given the horizontal distance and elevation gain.
Elevation Gradient Calculator
Calculate the slope or grade percentage between two geographic points given their elevations and horizontal distance.
Distance Between Coordinates Calculator
Compute the distance between two latitude/longitude points using Haversine (great-circle), Euclidean (flat-Earth approximation), or Manhattan (city-block) formulas.
Timezone Offset Calculator
Convert a time from one timezone to another given the UTC offsets of both.
Earthquake Distance Calculator
Estimate the distance from a seismograph station to an earthquake epicenter using the arrival time difference between P and S seismic waves.
Horizon Distance Calculator
Calculate the maximum distance at which an observer can see a target object over the horizon, based on both their heights above sea level.
Heat Island Effect Calculator
Estimate the intensity of the urban heat island effect by comparing city and rural temperatures, adjusted for wind speed.
Geographic Midpoint Calculator
Find the true geographic center between two GPS coordinates, with optional weighting for each location.
Sunrise Sunset Time Calculator
Estimates local sunrise, sunset times, and total daylight hours for any latitude, longitude, and date.
Great Circle Distance Calculator
Finds the shortest path between two points on Earth's curved surface using GPS coordinates.
Heat Index Climate Calculator
Calculate the apparent 'feels like' temperature by combining air temperature, humidity, and wind speed.
Map Scale Calculator
Convert a distance measured on a paper or digital map to the corresponding real-world distance using the map's scale ratio.
Urban Sprawl Index Calculator
Measure urban sprawl by comparing the percentage growth of built-up urban area to population growth.
Drainage Density Calculator
Calculate the drainage density of a watershed by dividing total stream length by drainage area.
Geographic Area Calculator
Calculate the area of rectangular, circular, or triangular regions in square kilometers, square miles, or hectares.
Watershed Drainage Area Calculator
Estimate the average annual runoff volume leaving a watershed from its drainage area, annual rainfall and a runoff coefficient.
Magnetic Declination Adjuster
Convert a compass (magnetic) bearing to a true bearing by applying the local magnetic declination.
Sun Angle Calculator
Estimate the sun's maximum elevation angle above the horizon for a given latitude and day of year.
Wind Chill Calculator
Calculate the wind chill temperature using the NWS/Environment Canada 2001 formula based on air temperature and wind speed.
Coastline to Area Ratio Calculator
Compute the coastline-to-area ratio of a landmass by dividing coastline length by the square root of land area.
Vegetation Index Calculator
Calculate the Normalized Difference Vegetation Index (NDVI) from near-infrared and red reflectance values.
River Gradient Calculator
Calculate the steepness of a river or stream in metres per kilometre.
Time Zone Difference Calculator
Compute the hour gap between two cities using their UTC offsets, with automatic wrap-around across the date line.