--- title: "Triangle Calculator | Area Perimeter Side Tool | XTRAW Tools" description: "Calculate triangle area, perimeter, angles, and side relationships with a free browser-based triangle calculator." url: "https://xtraw.com/tools/calculators/science-calculators/engineering-calculators/triangle-calculator" date: "2026-05-22T00:34:27+00:00" language: "en-GB" --- [Wire Size Calculator](https://xtraw.com/tools/calculators/science-calculators/engineering-calculators/wire-size-calculator)[Capacitor Calculator](https://xtraw.com/tools/calculators/science-calculators/engineering-calculators/capacitor-calculator) [![Triangle Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/xtraw-triangle-calculator-360x360.jpg)](https://xtraw.com/images/virtuemart/product/xtraw-triangle-calculator-360x360.jpg "Triangle Calculator from XTRAW Tools") popular [Back to: Engineering Calculators](https://xtraw.com/tools/calculators/science-calculators/engineering-calculators "Engineering Calculators") # Triangle Calculator Calculate triangle area, perimeter, angles, and side relationships. Use this free browser-based triangle calculator from XTRAW Tools. **Triangle Calculator** helps you calculate triangle area, perimeter, angles, and side relationships. Use this free browser-based tool from XTRAW Tools to compare inputs, calculate results, and plan your next step. ## How to Use the Triangle Calculator 1. Enter the required inputs shown in the form. 2. Review the number, base, random range, matrix, probability, geometry, fraction, or integer assumptions. 3. Run the tool, then adjust one input at a time to compare scenarios or check your work. ## What This Tool Helps With Calculate triangle area, perimeter, angles, and side relationships. It is designed for students, teachers, engineers, builders, DIY users, and anyone solving triangle measurements who want a fast, browser-based result before relying on an instructor, textbook, calculator app, code library, professional source, or specialist. - Side a: 3 - Side b: 4 - Side c: 5 ## Common Uses People use this tool when they need a quick way to solve math, convert values, check formulas, generate random values, summarize number systems, or verify technical results. - **Math Solving:** Solve school, study, work, coding, technical, or everyday math problems using clear numeric inputs. - **Measurement:** Use dimensions, values, ratios, or measurements to calculate a specific result. - **Material Estimating:** Use geometry measurements to support rough material or layout estimates. ## Formula or Method Area can be calculated using base × height / 2 or Heron’s formula when three sides are known. ## Example **Example inputs:** Side a: 3; Side b: 4; Side c: 5 **Example result:** Using the default 3-4-5 triangle, perimeter is 12 and area is 6. ## Related Tools - [Pythagorean Theorem Calculator](https://xtraw.com/tools/pythagorean-theorem-calculator) - [Circle Calculator](https://xtraw.com/tools/circle-calculator) - [Distance Between Two Points Calculator](https://xtraw.com/tools/distance-between-two-points-calculator) - [Slope Calculator](https://xtraw.com/tools/slope-calculator) - [Midpoint Calculator](https://xtraw.com/tools/midpoint-calculator) - [Scientific Calculator](https://xtraw.com/tools/scientific-calculator) ## Triangle Calculator FAQ ### Is the Triangle Calculator free? Yes. This tool is free to use on XTRAW Tools. ### Do I need to create an account? No. XTRAW tools are designed for browser-based use without requiring an account. ### Are the results exact? Results may depend on the inputs, formula, rounding, and purpose of the tool. Always verify important results before relying on them. **Disclaimer:** This tool is provided for general informational, educational, and convenience purposes only. It is not legal, financial, medical, engineering, construction, academic, safety, or professional advice. Always verify important results with a qualified professional, instructor, authoritative source, or appropriate specialist before making decisions. **Related Products** ![Tooltip]() [![Pythagorean Theorem Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/resized/xtraw-pythagorean-theorem-calculator-360x360_230x230.jpg) Pythagorean Theorem Calculator](https://xtraw.com/tools/calculators/math-calculators/pythagorean-theorem-calculator "Pythagorean Theorem Calculator") Calculate the missing side of a right triangle using the Pythagorean theorem. Use this free browser-based pythagorean theorem calculator from XTRAW Tools. Custom prototype for related products [![Circle Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/resized/xtraw-circle-calculator-360x360_230x230.jpg) Circle Calculator](https://xtraw.com/tools/calculators/science-calculators/engineering-calculators/circle-calculator "Circle Calculator") Calculate circle area, circumference, diameter, and radius relationships. Use this free browser-based circle calculator from XTRAW Tools. Custom prototype for related products [![Scientific Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/resized/xtraw-scientific-calculator-360x360_230x230.jpg) Scientific Calculator](https://xtraw.com/tools/calculators/math-calculators/scientific-calculator "Scientific Calculator") Perform advanced arithmetic, powers, roots, logarithms, trigonometry, and scientific math. Use this free browser-based scientific calculator from XTRAW Tools. Custom prototype for related products **Related Categories** ![Tooltip]()[![Math Calculators category image](https://xtraw.com/images/virtuemart/category/17_math_calculators.jpg) Math Calculators](https://xtraw.com/tools/calculators/math-calculators "Math Calculators") Custom prototype for related categories [![Geometry Calculators category image](https://xtraw.com/images/virtuemart/category/146_geometry-calculators.jpg) Geometry Calculators](https://xtraw.com/tools/calculators/math-calculators/geometry-calculators "Geometry Calculators") Custom prototype for related categories [![Education Tools category image](https://xtraw.com/images/virtuemart/category/086_education_tools_350x350.jpg) Education Tools](https://xtraw.com/tools/industry-tools/education-tools "Education Tools") Custom prototype for related categories [![Engineering Calculators category image](https://xtraw.com/images/virtuemart/category/157_engineering-calculators.jpg) Engineering 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