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[Compound Interest Calculator](/apps/compound-interest-calculator)\n- [Investment Calculator](/apps/investment-calculator)\n- [Retirement Calculator](/apps/retirement-calculator)\n- [Future Value Calculator](/apps/future-value-calculator)\n- [Net Present Value Calculator](/apps/net-present-value-calculator)\n- [Inflation Calculator](/apps/inflation-calculator)\n- [Salary Calculator](/apps/salary-calculator)\n- [Income Tax Calculator](/apps/tax-calculator)\n- [Sales Tax Calculator](/apps/sales-tax-calculator)\n- [Tip Calculator](/apps/tip-calculator)\n- [Percentage Calculator](/apps/percentage-calculator)\n- [APR to APY](/apps/apr-to-apy)\n- [Money Converter](/apps/money-converter)\n- [Send Money](/apps/send-money)\n- [Invoice Generator](/apps/invoice-generator)\n- [Calculator](/apps/calculator)\n\n\u003c!--THE END--\u003e\n\n- Health\n- [BMI Calculator](/apps/bmi-calculator)\n- [Body Fat Calculator](/apps/body-fat-calculator)\n- [Calorie 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END--\u003e\n\n- Fun\n- [Age Calculator](/apps/age-calculator)\n- [Date Calculator](/apps/date-calculator)\n- [What Day Is It](/apps/what-day-is-it)\n- [Lottery Number Generator](/apps/lottery-number-generator)\n\n\u003c!--THE END--\u003e\n\n- Productivity\n- [Pomodoro Timer](/apps/pomodoro-timer)\n\n\u003c!--THE END--\u003e\n\n- Math\n- [Pythagoras Theorem](/apps/pythagoras-theorem)\n- [Roman Numeral Converter](/apps/roman-numeral-converter)\n\nPythagorean Theorem Calculator\n\n# Pythagorean Theorem Calculator\n\nCalculate any side of a right triangle using the Pythagorean theorem by entering the other two sides. Essential for math students, engineers, and construction professionals. See step-by-step solutions with visual triangle diagrams.\n\na b c (hypotenuse)\n\nSide a\n\nFind\n\nSide b\n\nFind\n\nHypotenuse c\n\nFind\n\nResult\n\n—\n\nRight Triangle Verification\n\nEnter all three sides to verify\n\n## Solution Steps\n\nSteps will appear after calculation.\n\n📋 Copy Results\n\nCopied to clipboard!\n\n📱 Install Tejji for quick access to this tool Install\n\n📱\n\nQuick Access\n\nInstall this tool on your device for instant access\n\nInstall App\n\n📱\n\nQuick Access\n\nInstall this tool on your device for instant access\n\nInstall App\n\n## Related Products\n\n[📘 Math Textbooks →](https://www.amazon.com/s?k=math%20textbook%20geometry\u0026tag=tejji-20) [📐 Geometry Sets →](https://www.amazon.com/s?k=geometry%20set%20compass%20protractor\u0026tag=tejji-20) [🔢 Scientific Calculators →](https://www.amazon.com/s?k=scientific%20calculator%20school\u0026tag=tejji-20)\n\n*As an Amazon Associate, tejji.com earns from qualifying purchases.*\n\n## Frequently Asked Questions\n\n### What is the Pythagorean theorem?\n\nThe Pythagorean theorem states that in a right triangle, the square of the hypotenuse (c) equals the sum of the squares of the other two sides: a squared + b squared = c squared.\n\n### How do I find the hypotenuse?\n\nEnter the two shorter sides (a and b) and click \"Find\" next to the hypotenuse. The formula is c = sqrt(a squared + b squared). For example, sides 3 and 4 give c = sqrt(9 + 16) = sqrt(25) = 5.\n\n### How do I find a missing leg?\n\nEnter the hypotenuse and one leg, then click \"Find\" on the missing side. For example, to find b: b = sqrt(c squared - a squared). If c = 13 and a = 5, then b = sqrt(169 - 25) = sqrt(144) = 12.\n\n### What are common Pythagorean triples?\n\nCommon triples include (3, 4, 5), (5, 12, 13), (8, 15, 17), (7, 24, 25), and their multiples. These are integer sets that satisfy a squared + b squared = c squared.\n\n### What is the best free Pythagorean theorem calculator?\n\nThis Pythagorean Theorem Calculator is one of the best free tools available. It finds any missing side, shows step-by-step solutions, verifies right triangles, and calculates angles — all without sign-up.\n\n### Is this Pythagorean theorem calculator accurate and safe?\n\nYes. All calculations use standard floating-point arithmetic in your browser. No data is sent to any server, and no personal information is collected.\n\n## Related Tools\n\n[Ⅳ Roman Numerals math](/apps/roman-numeral-converter) [% Percentage Calculator finance](/apps/percentage-calculator) [🎓 GPA Calculator education](/apps/gpa-calculator) [📅 Age Calculator utility](/apps/age-calculator) [⚖ BMI Calculator health](/apps/bmi-calculator)\n\n📱\n\nQuick Access\n\nInstall this tool on your device for instant access\n\nInstall App","footer":"\n\n📱 Install Tejji for quick access to this tool Install\n\nTools\n\n- [All Apps](/apps/)\n- [Converters](/convert/)\n- [IP Tools](/ip/)\n- [Calculator](/apps/calculator)\n\nExplore\n\n- [Time \u0026 Date](/time-date/)\n- [Postal Codes](/zip-codes/)\n- [Typing](/typing/)\n- [Extensions](/browser/chrome/extensions/)\n\nCompany\n\n- [About](/home/about)\n- [Contact](/home/contact)\n- [Privacy](/home/privacy)\n- [Terms](/home/terms)\n\nSupport\n\n- [Feedback](/home/contact)\n- [Buy me a coffee](https://buymeacoffee.com/tejji)\n\n© 2026 [Tejji.com](/) — Free online tools for everyone.\n\nWe use cookies for analytics and ads. By clicking \"Accept\", you consent to our use of cookies. [Privacy Policy](/home/privacy)\n\nReject Accept"},"metadata":{"title":"Pythagorean Theorem – Find Any Side \u0026 Verify Right Triangles | Tejji","description":"Free online Pythagorean theorem calculator — find any side of a right triangle instantly. Enter two sides to calculate the third with step-by-step solution. No sign-up required.","imageUrl":"https://tejji.com/page/og-default.png","author":null,"published":null,"modified":null},"rate":{"price":{"priceMicros":0,"currency":""},"license":{"cuid":"","licenseType":"","licensePath":"","permissions":[],"validUntil":""},"error":""}}]