15 Best Free Online Right Triangle Calculator Websites

Here is a list of the best free online right triangle calculator websites. A right triangle is a triangle that has a 90-degree angle in it. This angle is between the base and height of the triangle. The third side is also known as the hypotenuse of the triangle. The remaining two angles with the hypotenuse are called complementary angles.

A right triangle calculator can find out any side and angle of the triangle. It uses the Hypotenuse Theorem and trigonometry functions for the calculation. That means, you only need to know two values. Those two values can be two sides, complementary angels, or a combination of one side and one angle. Most calculators also include perimeter and the are of the triangle into the calculation. I’m covering 15 websites where you can find a right triangle calculator and use it to find the values of a right-angled triangle.

My Favorite Right Triangle Calculator

Calculator.net is my favorite right triangle calculator website on this list. This calculator can help you find the base, height, hypotenuse, complementary angles, perimeter, and the area of any given right triangle. For that, you have to enter any two known values out of these and it instantly finds the rest. The best part about this is that it also shows all the calculation steps. With a single click, you can view all the steps of the calculation and understand how to do it yourself using what formula.

You can also check out our list of the best free Online Quadratics Calculator Websites, Online Beam Spread Calculator Websites, and Online Depth of Field Calculator Websites.

Calculator.net

Calculator.net offers a free online right triangle calculator. This calculator has data fields for all three sides, two angles, hypotenuse, perimeter, and area. You can enter the known values into the calculator and find the unknown values. It takes a second and reloads the page to show the results. Along with the values, it also gives you an option to check out the calculation steps. This section explains all the steps involved in the calculation. This comes in handy to understand the calculation and know how it actually works.

Available Data Fields: Three Sides, Two Angles, Hypotenuse, Perimeter, and Area of a right triangle.

What you can calculate: Any Side, Angle, Hypotenuse, Perimeter, and Area of a right triangle.

Omni Calculator

Omni Calculator is a free website that has a vast collection of online calculators. It has a Trigonometry Calculator that you can use to calculate the sizes, angles, and even the area of a right triangle. This calculator lets you choose a mode based on what values you know. Then it gives you the flexibility to change the unit of each value separately. So, all you have to do is pick a mode as per your needs and then enter the known values in the respective fields. As soon as you do that, it instantly calculates the missing values and shows those values in the respective fields.

Available Data Fields: Three Sides, Two Angles, and Area of a right triangle.

What you can calculate: Any Side, Angle, or Area of a right triangle.

Keisan Online Calculator

Keisan Online Calculator is another free website with a collection of online calculators. The right triangle calculator on this website offers 10 different combinations to find the base, height, angle, hypotenuse, and area of the right triangle. Depending on what values you know in the triangle, you can pick a relevant combination. Then you can simply insert those values and calculate the rest of the values. Apart from that, this calculator lets you pick how many digital you want to see after the decimal for the fraction values. And, you also get an option to print or save the calculation page as a PDF.

Available Data Fields: Three Sides, Two Angles, Hypotenuse, and Area of a right triangle.

What you can calculate: Any Side, Angle, Hypotenuse, and Area of a right triangle.

Pi Day

Pi Day is a free website that has various mathematical calculators. It has an online right triangle calculator that you can use for free. This calculator is limited to calculating one side, angles, perimeter, and area of a right triangle. For that, you have to enter the base, height, and hypotenuse of the triangle. After that, when you click the Calculate button, it instantly shows the unknown values. This calculator lets you change the measuring unit of each value separately.

Available Data Fields: Base, Height, and Hypotenuse a right triangle.

What you can calculate: One Side, Angles, Perimeter, and Area of a right triangle.

Bauer.uh.edu

Bauer.uh.edu is one of the best websites to calculate and under the right triangle. From the values of an angle and one side, it can calculate the rest of the sides, complementary angle, and area of the triangle. Along with the results, it also plots the respective triangle on the screen. It uses color to represent each value clearly in the calculation as well as in the diagram. Along with that, it includes two cases for the right triangle calculation. Both cases follow the color code and explain the condition with the help of the respective formula.

Available Data Fields: One side and one angle of a right triangle.

What you can calculate: Two Sides, complementary Angle, and the Area of a right triangle.

RapidTables

RapidTables is a free website with a collection of online calculators and tools. It has an online right triangle calculator that you can use for free. This is a simple calculator where you can enter one side and angle or two sides, or another known combination of values to calculate the rest. As per your needs, you can enter the values of the sides and/or angles and then click the calculate button to get the rest of the values. Apart from that, you get an option to change the measuring unit of angles. It also features a Trigonometric functions calculator right below the Right Triangle Calculator.

Available Data Fields: Three Sides and Two Angles of a right triangle.

What you can calculate: Any Side or Angle of a right triangle.

Everyday Calculation

Everyday Calculation is a website with free calculators and unit converters for general and everyday use. It has a right-angle triangle calculator that you can use to calculate any side, angles, and area of the triangle. It has input fields for 3 sides, two, angles, and are of the triangle. You can input the value in any possible combination and find the rest of the values. Right next to the output, it also shows the Pythagoras’ Theorem, Trigonometric functions, and other related formulas.

Available Data Fields: Three Sides, Two Angles, Hypotenuse, and Area of a right triangle.

What you can calculate: Any Side, Angles, and Area of a right triangle.

CarbideDepot

CarbideDepot is a free online right triangle calculator website. This calculator has five input fields for three sides and two angles of a right triangle. You can enter all the known values of the triangle and calculate the rest. Based on those values, this calculator calculates the missing values and then displays those values in the respective fields. This way, you can easily calculate any side or angle of a right triangle using this free calculator.

Available Data Fields: Three Sides and Two Angles of a right triangle.

What you can calculate: Any Side or Angle of a right triangle.

Byjus

Byjus is an educational platform that provides free and paid learning materials and online classes for every age group. It has an online right triangle calculator that you can use for free. You can enter two sides of the triangle. Based on that, it calculates the third side, 2 angles, perimeter, and area of the triangle. That’s pretty much all. There is no option to change the measuring unit or calculate other combinations of values.

Available Data Fields: 2 Sides of a right triangle.

What you can calculate: One Side, Angles, Perimeter, and Area of a right triangle.

Easy Calculation

Easy Calculation offers a free online right triangle calculator. This is a simple calculator where you can pick what you want to calculate. It gives two fields to pick a combination of either side and angle of the triangle. After selecting what values you want to calculate, you have to enter the known values into the calculator. Based on the input values, it instantly shows the other values within the calculator.

Available Data Fields: Three Sides and Two Angles of a right triangle.

What you can calculate: Any Side and Angle of a right triangle.

Cleave Books

Cleave Books is another free website with a free online right-angled triangle calculator. This calculator has 7 input data fields for all three sides, two angles, and the area of the triangle. You can enter any two values out of 7 and find the rest. Apart from that, you can also set how many digits you want to include after the decimal for respective values. This website also shows additional information explaining the properties of a right triangle, formulas, and more.

Available Data Fields: Three Sides, Two Angles, Hypotenuse, and Area of a right triangle.

What you can calculate: Any Side, Angles, and Area of a right triangle.

123calculus

123calculas is another free website with an online right triangle calculator. This calculator offers 6 combinations of three sides and two complementary angles of a right triangle. You have to pick a combination based on what values you know. Then you can enter those values and calculate the rest of the value of the triangle including perimeter and area as well. Apart from the calculator, this website also explains the features of a right triangle. It includes various formulas with guides to learn the calculations.

Available Data Fields: Three Sides and Two Angles of a right triangle.

What you can calculate: Any Side, Angle, Perimeter, and Area of a right triangle.

Math Warehouse

Math Warehouse is a free website with various calculators, tools, games, and learning materials for math. It has a triangle calculator that can find either all three sides or all three angles of a triangle. You have to enter either all three sides or all three angles. After that, when you click the Calculate button it shows the remaining values on the screen. Along with the calculation, it also creates a diagram of the respective triangle. In the case of a right-angled triangle, one angle is always 90 degrees. So, you can enter the rest of the value and use this calculator for the right triangle as well.

Available Data Fields: Three Sides, or Three Angles of a right triangle.

What you can calculate: All sides or all angles of a right triangle.

Analyze Math

Analyze Math offers a free online right triangle calculator. This calculator is a combination of 5 calculators. These calculators are basically a combination of two sides, one side and one angle of the triangle. So, based on the known values, you can pick a calculator and insert your values. Based on that, you can calculate the rest of the values including the perimeter and the area of the triangle.

Available Data Fields: Two Sides and an Angle of a right triangle.

What you can calculate: Two Sides, Complementary Angles, Perimeter, and Area of a right triangle.

Inch Calculator

Inch Calculator is another free website with a collection of online calculators. It has a right triangle calculator that you can use to find the sides, complementary angles, perimeter, and the area of any given right-angled triangle. It has input data fields for all these values. You just have to enter any two values to know the rest. It shows the calculator right below the calculator. Along with that, it also gives you a link to share your calculation online.

Available Data Fields: Three Sides, Two Angles, Perimeter, and Area of a right triangle.

What you can calculate: Any Side, complementary Angles, Perimeter, and Area of a right triangle.