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Right Trapezoid Area Calculator.

Calculate area as the average of parallel bases times height.

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Set your values

Results update as you type.

02 / ANSWER

Base 1

Base 2

Height

Base 1 must be finite.

Results update automatically as you type.

Use Cases

Geometry homework and exams

Quickly verify your manual calculations for right trapezoid area problems in math classes or study sessions.

Example: Check your answer for a trapezoid with bases 8 and 12 units and height 5 units.

Construction and design projects

Estimate material needs or space for trapezoidal shapes in flooring, tiling, or landscaping.

Example: Calculate the area of a trapezoidal garden bed with bases 3 ft and 5 ft, height 4 ft.

Frequently Asked Questions

What is a right trapezoid?: A right trapezoid is a four-sided figure with one pair of parallel sides (bases) and two right angles. Its area is found by averaging the lengths of the two bases and multiplying by the height.
How do I use this calculator?: Enter the lengths of Base 1 and Base 2 (the parallel sides) and the Height (the perpendicular distance between them). The calculator instantly computes the area using the formula: Area = (Base1 + Base2) / 2 × Height.
What units should I use?: You can use any consistent unit for all inputs (e.g., inches, feet, meters). The area will be in square units of that same unit. For example, if inputs are in meters, the area is in square meters.

Tips & Common Mistakes

Tips

Ensure Base 1 and Base 2 are the parallel sides of the trapezoid.
Height must be the perpendicular distance between the bases, not the slanted side length.
Use the same unit for all three inputs to get the area in square units.
Double-check your inputs for accuracy before relying on the result.

Common Mistakes to Avoid

Entering the slanted side length as the height instead of the perpendicular distance.
Using different units for the bases and height, leading to incorrect area units.
Confusing the order of bases; the formula is symmetric, so order doesn't matter, but ensure both are correct.

Last updated: August 13, 2026

Use Cases

Geometry homework and exams

Quickly verify your manual calculations for right trapezoid area problems in math classes or study sessions.

Example: Check your answer for a trapezoid with bases 8 and 12 units and height 5 units.

Construction and design projects

Estimate material needs or space for trapezoidal shapes in flooring, tiling, or landscaping.

Example: Calculate the area of a trapezoidal garden bed with bases 3 ft and 5 ft, height 4 ft.

Frequently Asked Questions

What is a right trapezoid?

A right trapezoid is a four-sided figure with one pair of parallel sides (bases) and two right angles. Its area is found by averaging the lengths of the two bases and multiplying by the height.

How do I use this calculator?

Enter the lengths of Base 1 and Base 2 (the parallel sides) and the Height (the perpendicular distance between them). The calculator instantly computes the area using the formula: Area = (Base1 + Base2) / 2 × Height.

What units should I use?

You can use any consistent unit for all inputs (e.g., inches, feet, meters). The area will be in square units of that same unit. For example, if inputs are in meters, the area is in square meters.

Tips & Common Mistakes

Tips

Ensure Base 1 and Base 2 are the parallel sides of the trapezoid.
Height must be the perpendicular distance between the bases, not the slanted side length.
Use the same unit for all three inputs to get the area in square units.
Double-check your inputs for accuracy before relying on the result.

Common Mistakes to Avoid

Entering the slanted side length as the height instead of the perpendicular distance.
Using different units for the bases and height, leading to incorrect area units.
Confusing the order of bases; the formula is symmetric, so order doesn't matter, but ensure both are correct.

Use Cases

Geometry homework and exams

Quickly verify your manual calculations for right trapezoid area problems in math classes or study sessions.

Example: Check your answer for a trapezoid with bases 8 and 12 units and height 5 units.

Construction and design projects

Estimate material needs or space for trapezoidal shapes in flooring, tiling, or landscaping.

Example: Calculate the area of a trapezoidal garden bed with bases 3 ft and 5 ft, height 4 ft.

Frequently Asked Questions

What is a right trapezoid?

A right trapezoid is a four-sided figure with one pair of parallel sides (bases) and two right angles. Its area is found by averaging the lengths of the two bases and multiplying by the height.

How do I use this calculator?

What units should I use?

You can use any consistent unit for all inputs (e.g., inches, feet, meters). The area will be in square units of that same unit. For example, if inputs are in meters, the area is in square meters.

Tips & Common Mistakes

Tips

Ensure Base 1 and Base 2 are the parallel sides of the trapezoid.
Height must be the perpendicular distance between the bases, not the slanted side length.
Use the same unit for all three inputs to get the area in square units.
Double-check your inputs for accuracy before relying on the result.

Common Mistakes to Avoid

Entering the slanted side length as the height instead of the perpendicular distance.
Using different units for the bases and height, leading to incorrect area units.
Confusing the order of bases; the formula is symmetric, so order doesn't matter, but ensure both are correct.