Population Geography - Quick Revision Sheet
Quick revision
Formulas
- Density of population = total population / total area
- Nutritional density = total population / total cropped area
- Net migration rate N = 1000 x (I - E) / P
- Growth rate = (CBR - CDR +/- net migration) / 1000
- RNI = CBR - CDR (no migration)
- Dependency ratio = (under 15 + over 65) / (15-64)
- Doubling time = 70 / growth rate (Rule of 70)
Key numbers
| Fact | Value |
|---|---|
| High / moderate / low density | >100 / 10-80 / <10 per sq.km |
| World arable land, nutritional density | 13.3%, 325 per sq.km |
| India arable land, nutritional density | 48.83%, 753 per sq.km |
| World population 1750 / now | 550 million / 7.6 billion |
| Projections 2030 / 2050 / 2100 | 8.6 / 9.7 / 11.2 billion |
| 6 billion / 7 billion | 12 Oct 1999 / 31 Oct 2011 |
| India sex ratio (2011) | 933 females per 1000 males |
| India literacy (2011) | 74.04% |
| India density, urban share | 455 per sq.km, 33.6% |
Records
- Niger: highest fertility (6.49); Singapore: lowest fertility (0.83) and highest nutritional density
- South Sudan: highest growth rate (3.83%, 2017)
- Monaco: highest life expectancy; Chad: lowest
- Burkina Faso: lowest literacy (21.8%)
- Qatar: highest male to female ratio; Latvia: highest sex ratio
- Tripura: highest literacy in India (94.65%)
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Study NotesConcepts & methods
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10 Map Projection
11 Thematic Mapping
12 Representation of Geographical Data
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