How it works
Use one length unit for all sides. Area formulas: s², lw, Heron, ½(b₁+b₂)h, πr², sector fraction, πab, bh.
A=s² · A=lw · √[s(s−a)(s−b)(s−c)] · ½(b₁+b₂)h · πr² · (θ/360)πr² · πab · bh
When to use
Use this tool when you need to: land example: 220×99 ft → 21,780 ft² (½ acre). Square side 10. Triangle: three 77 ft sides (Heron). Sector: 60° of a 16 in pie.
How to use this tool
- Enter your values in the fields above.
- Review the formula and any mode options for your problem.
- Read the result and the step-by-step solution.
Land example: 220×99 ft → 21,780 ft² (½ acre). Square side 10. Triangle: three 77 ft sides (Heron). Sector: 60° of a 16 in pie.
Frequently asked questions
- What is the Area Calculator?
- Use one length unit for all sides. Area formulas: s², lw, Heron, ½(b₁+b₂)h, πr², sector fraction, πab, bh.
- How do I use the Area Calculator?
- Enter the required values, then calculate. The Area Calculator shows results, formulas, and step-by-step work when available. No account is required.
- What formula does the Area Calculator use?
- A=s² · A=lw · √[s(s−a)(s−b)(s−c)] · ½(b₁+b₂)h · πr² · (θ/360)πr² · πab · bh
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