Geometry & Shapes
Trapezoid Calculator
Trapezoid Calculator is a browser-based calculator tool on CalcToolsBase. Free, browser-based Trapezoid Calculator with instant, clearly-labelled results. No signup, no uploads. To use it, enter your values and view the result directly in your browser — no signup and nothing to install.
Trapezoid Calculator helps you find the area of a trapezoid. Enter your parallel side a, parallel side b and height and it returns the area instantly, right in your browser with nothing uploaded.
About this calculator
Trapezoid Calculator makes it easy to find the area of a trapezoid. Enter your parallel side a, parallel side b and height, and it uses the trapezoid area formula to show the area instantly. Everything is computed in your browser, for both speed and privacy.
Made for students, designers and DIYers, it gives the area from your parallel side a, parallel side b and height in one step — clearly laid out, free to use, and computed entirely on your device.
How to use
- Enter the first parallel side (a).
- Enter the second parallel side (b).
- Enter the perpendicular height.
- Press Calculate to find the trapezoid's area.
Why use Trapezoid Calculator
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Accurate
Uses standard formulas where applicable; check critical results before relying on them.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Honest disclaimers wherever browser limits or regional rules apply.
Common uses
Trapezoid when comparing two shapes' areas
Trapezoid for flooring and surface estimates
Trapezoid when sizing a room or panel
Trapezoid when teaching shape area
Trapezoid for craft and woodworking projects
Trapezoid when checking a homework answer
Technical notes
Trapezoid Calculator uses area = ½ × (a + b) × height from the two parallel sides and the height you enter.
Results assume exact, idealised shapes; real-world measurement error is not included.
Nothing you type is uploaded — the calculation happens entirely on your device.
FAQ
How is the area of a trapezoid calculated?
The area is the average of the two parallel sides multiplied by the perpendicular height: ((a + b) / 2) times h.
Which sides are a and b?
Sides a and b are the two parallel sides; the height is the perpendicular distance between them.
Does it matter which parallel side I enter first?
No. Adding a and b gives the same result regardless of order.
Does the Trapezoid Calculator send my data to a server?
No. The Trapezoid Calculator runs entirely in your browser, so nothing you enter is uploaded, stored, or shared.
Worked example
Parallel sides 6 and 10, height 4: area = ½ × (6+10) × 4 = 32.