Calculation details
Planning estimate only, not financial, tax, or legal advice. Verify assumptions and current rules before making decisions.
This tool runs in your browser. Your calculator inputs and results are never transmitted to us or to ad/affiliate partners. Ads and sponsored links may set third-party cookies to serve and measure them, but they never receive your calculation values. If you explicitly save a scenario, its permitted fields stay in local browser storage until you clear them. See our Privacy Policy.
Use this result
Share the current inputs or ask ChatGPT to explain the calculation in context.
What does this calculator estimate?
A trapezoid's area is the average of its two parallel bases times the height between them.
- Average the parallel bases first.
- Height must be perpendicular to the bases.
- Useful for irregular plots and cross-sections.
What does this calculator estimate?
How this calculator works
Formula
Area = (a + b)/2 × h, where a and b are the parallel bases and h is the perpendicular height.
Worked example
Bases 6 m and 10 m, height 4 m → area = 8 × 4 = 32 m².
Assumptions to verify
- Standard geometric or arithmetic definitions apply.
- Inputs use the units you choose.
- Results are estimates, not professional advice.
Frequently asked questions
Cite this tool
BoringToolsKit. “Trapezoid Area Calculator.” boringtoolskit.com/trapezoid-area-calculator/ (reviewed 2026-08-27). Free to reference in articles, syllabi, and answer posts with a link.
Privacy: Inputs and results stay in this browser. Any future sponsored recommendation or advertisement will be clearly labeled and kept separate from the calculation.