Convert Square Kilometer to Microbarn
Convert square kilometers to microbarns instantly. 1 square kilometer = 1e+40 microbarn — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Microbarn to Square Kilometer converter for the reverse conversion.
Units explained
Square Kilometer
A square kilometer is a metric unit of area equal to 1,000,000 m² (one million square meters), or 100 hectares. It is used for measuring large land areas, regional geography, and country-scale statistics.
Derived by squaring the kilometer (1000 m). The kilo- prefix comes from the Greek 'chilioi' (thousand).
Square kilometers express the area of cities, districts, lakes, forests, and entire countries. India's total area is approximately 3,287,263 km². 1 km² equals 100 hectares or about 247.105 acres.
Kilometer has been part of the metric system since 1795.
Microbarn
A microbarn is a scientific unit of area equal to exactly 10⁻³⁴ m² (10⁻⁶ barn).
Derived from the barn using the standard SI micro- prefix. Identical in value to the humor unit 'outhouse'.
Microbarns appear in particle physics for moderately rare process cross-sections. They are widely used in heavy-ion physics and electroweak cross-section measurements.
Standard derivative of the barn unit.
Square Kilometer to Microbarn conversion formula
The relationship between square kilometers and microbarns:
To convert square kilometers to microbarns, multiply the value in square kilometers by 1e+40. To reverse, multiply microbarns by 1e-40.
How to use this converter
Type a value into the calculator. The result in microbarns updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Microbarn to Square Kilometer converter for the reverse direction.
Step-by-step: convert square kilometers to microbarns
- Write down the value in square kilometers (km²).
- Multiply that value by the factor 1e+40.
- The product is the equivalent value in microbarns (µb).
- To reverse, multiply the microbarn value by 1e-40.
Worked examples
Example 1 — Convert 1 km² to µb:
1 × 1e+40 = 1e+40 µb
Example 2 — Convert 100 km² to µb:
100 × 1e+40 = 1e+42 µb
Square Kilometer to Microbarn conversion table
Standard reference values for converting square kilometers to microbarns:
| Square Kilometer [km²] | Microbarn [µb] |
|---|---|
| 0.01 | 1e+38 |
| 0.1 | 1e+39 |
| 1 | 1e+40 |
| 2 | 2e+40 |
| 3 | 3e+40 |
| 4 | 4e+40 |
| 5 | 5e+40 |
| 10 | 1e+41 |
| 20 | 2e+41 |
| 30 | 3e+41 |
| 40 | 4e+41 |
| 50 | 5e+41 |
| 100 | 1e+42 |
| 500 | 5e+42 |
| 1000 | 1e+43 |
Frequently asked questions
How many microbarns is 1 square kilometer?
How do I convert square kilometers to microbarns?
How do I convert microbarns back to square kilometers?
How many microbarns is 100 square kilometers?
Popular area unit conversions
Convert Square Kilometer to other area units
Show all Square Kilometer conversions
Metric / SI (15 units)
Imperial / US Customary (15 units)
US Survey (5 units)
Indian Subcontinent (16 units)
Other Regional (10 units)
Scientific / Physics (5 units)
Sources & references
Conversion factor (1 km² = 1e+40 µb) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.