Geography Calculators
Time Zone Calculator
Convert time between cities with daylight saving time, find local solar time by longitude (15° = 1 hour) and the time zone number.
Temperature and Pressure vs Altitude Calculator
Temperature change with altitude (6 °C per km) and air pressure change (1 mmHg per 10.5 m): geography problems with solutions.
Distance by Coordinates Calculator
Distance between cities and points by latitude and longitude along the great circle, and along a meridian or parallel.
Azimuth and Compass Direction Calculator
Compass direction from an azimuth and back, back azimuth, true azimuth from magnetic, azimuth between two points.
Noon Sun Height Calculator
The Sun's height above the horizon at noon at any latitude on equinoxes, solstices or any date; latitude from the Sun's height.
River Fall and Gradient Calculator
The fall of a river from the source and mouth elevations and the gradient in m/km (‰), with a solution.
Humidity Calculator: Relative, Absolute, Dew Point
Relative and absolute humidity, saturation deficit and dew point from the school table or the Magnus formula.
Coordinate Converter: DMS to Decimal Degrees
Convert latitude and longitude between degrees, minutes, seconds and decimal degrees, with a solution.
Population Density and Growth Calculator
Population density, natural increase, birth and death rates per mille, net migration and total increase.
Water Salinity Calculator
Water salinity in per mille, the mass of salts in seawater and the mass of water needed for a given amount of salt.
Mean Temperature and Range Calculator
Daily, monthly and annual mean temperature and temperature range from readings, with a solution.
Day Length Calculator
Length of daylight, sunrise and sunset in local solar time for any latitude and date, polar day and polar night.
Heat Index Calculator: Feels-Like Temperature in Humid Weather
Feels-like temperature in hot weather from air temperature and relative humidity, with a danger level.
Wind Chill Calculator: Feels-Like Temperature in Wind
How cold it feels in the wind: wind chill from air temperature and wind speed, with frostbite risk.
Sunrise and Sunset Calculator
Sunrise and sunset times, solar noon, day length and civil twilight for a city or coordinates on any date.
Map Scale Calculator: Map and Real Distance
Map scale calculator: real distance from the map, map distance from the real one, and the scale from two distances.
Percent, Per Mille and Fractions Converter
Parts converter: decimal and common fractions, percentages, per mille and ppm. Conversion with a solution and a table.
Pressure Converter: Pa, kPa, atm, bar, mmHg
Pressure converter: pascals, kPa, MPa, bars, atmospheres, mmHg. Exact conversion with a solution and a table.
Continents Table
The continents of the Earth: area and highest point.
Oceans Table
The oceans of the Earth: area, greatest depth and the deepest point.
Longest Rivers Table
The longest rivers of the world and their length, with the Volga for comparison.
Wind Force Converter: Speed and Beaufort Scale
Convert wind speed to the Beaufort scale and back.
Country Codes ISO 3166
Names of countries and territories with ISO 3166-1 codes: alpha-2, alpha-3 and numeric.
Geography calculators solve school problems with explanations: time in different time zones, distances by coordinates, temperature and pressure change with altitude, the Sun's height, air humidity and population indicators.
- Time zones and azimuth — time in world cities, local time by longitude, directions and compass points.
- Distance by coordinates and coordinate converter — the degree grid, degrees, minutes and seconds.
- Altitude temperature and pressure, humidity, mean temperature and range.
- Noon Sun height and day length for any latitude and date.
- Population, river fall and gradient, water salinity.
Distances on a map and on the ground are calculated by the map scale calculator.