Square Kilometers to Square Inches
An instant square kilometers-to-square inches converter, with the formula and a reference table below.
| Square Kilometers | Square Inches |
|---|---|
| 1 km² | 1550003100.0062 in² |
| 2 km² | 3100006200.0124 in² |
| 3 km² | 4650009300.0186 in² |
| 5 km² | 7750015500.031 in² |
| 10 km² | 15500031000.062 in² |
| 25 km² | 38750077500.154999 in² |
| 50 km² | 77500155000.309998 in² |
| 100 km² | 155000310000.619995 in² |
How to use
- Enter a value in the Square Kilometers field.
- The Square Inches figure appears immediately — no button to press.
- Typing in the Square Inches field converts back to Square Kilometers the same way.
- Use the reference table for the values that come up most often.
Square Kilometers to Square Inches formula
The factor from square kilometers to square inches is 1.5500031e+09.
in² = km² × 1.5500031e+09
Why this factor: the square kilometer and the square inch are both defined against the square meter, so dividing one definition by the other gives 1.5500031e+09 directly. Both definitions are set out in full below.
To go the other way, divide by 1.5500031e+09 — or use the Square Inches to Square Kilometers converter, which is the same calculation reversed.
Worked example
Given 1000 km², multiplying by 1.5500031e+09 yields 1.55e+12 in².
1000 km² × 1.5500031e+09 = 1.55e+12 in²
The converter above does this for any value you type, in either direction.
What is a square kilometer?
A square kilometer is the area of a one-kilometer square — one million square meters.
Definition: Exactly 1×10⁶ square meters. Note it is the kilometer that is squared, not the prefix applied to a square meter.
Where it is used: City, national park and country areas, population density, and land cover statistics.
What is a square inch?
A square inch is the area of a one-inch square, used for small areas and pressure.
Definition: Exactly 0.00064516 square meter, following from the exact 25.4 mm inch.
Where it is used: Print and label areas, gasket and seal faces, and the denominator in psi.
Square Kilometers vs Square Inches
The square kilometer is a metric unit while the square inch is an imperial unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many square inches are in a square kilometer?
One square kilometer equals 1.5500031e+09 square inches.
What is the formula to convert square kilometers to square inches?
Multiply the number of square kilometers by 1.5500031e+09. To reverse it, divide by 1.5500031e+09 instead.
How do I convert square inches back to square kilometers?
Divide by 1.5500031e+09, which is the same as multiplying by 6.4516e-10.
How many square inches are in 10 square kilometers?
10 km² works out to 15500031000.062 in².
How is the square kilometer defined?
Exactly 1×10⁶ square meters. Note it is the kilometer that is squared, not the prefix applied to a square meter.