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Home, building & household

Solar panel area calculator

Estimate roof area and panel count for a target system size.

Your result

Complete the fields and calculate.

Calculation method and formula

round up(Target capacity [kWp] × 1000 ÷ Power per panel [W]) × Area per panel [m²] × (1 + Installation allowance [%] ÷ 100)

Understand the inputs

Target capacity
Unit: kWp. Use a measured value or your own assumption.
Power per panel
Unit: W. Use a measured value or your own assumption.
Area per panel
Unit: m². Use a measured value or your own assumption.
Installation allowance
Unit: %. Use a measured value or your own assumption.

Assumptions and limitations

Panel count is rounded up before applying panel area and mounting allowance. Pitch, shading, clearance and structural suitability need separate planning.

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

Worked example

Illustrative values. Replace them with your own inputs for your calculation.

Target capacity
10 kWp
Power per panel
440 W
Area per panel
2 m²
Installation allowance
10 %
Example result50.6 m²

Approximately 23 panels are required.

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does Solar panel area calculator work?+

round up(Target capacity [kWp] × 1000 ÷ Power per panel [W]) × Area per panel [m²] × (1 + Installation allowance [%] ÷ 100). Panel count is rounded up before applying panel area and mounting allowance. Pitch, shading, clearance and structural suitability need separate planning.

What assumptions should I consider for this result?+

Panel count is rounded up before applying panel area and mounting allowance. Pitch, shading, clearance and structural suitability need separate planning. The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

How accurate is the result?+

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation. Prices, measurements and model assumptions determine how well the result represents your situation.

Is this calculator free?+

Yes. Calculations and PDF export work without an account or registration.

What happens to my inputs?+

Calculations run in your browser. Results are saved locally only when you add them to My results; favourites and history are also local. Shared links contain your values. The currency tool requests the selected currencies from its rate provider without sending your amount.

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