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HomecalculatePythagorean Theorem Calculator

Pythagorean Theorem Calculator

Find the hypotenuse of a right triangle from its two shorter sides, using the Pythagorean theorem a² + b² = c².

Imperial

Triangle legs

Hypotenuse5.00unit

Mathematical model

hypotenuse = sqrt(legA * legA + legB * legB)

Main equation used by this calculator. Numeric steps follow the page's precision and rounding rules.

Term Glossary

Leg a
Leg a is a declared input for Pythagorean Theorem Calculator, measured in unit. Check this value and its unit before reusing the result.

Verification & transparency

Automated checks: engine-validated output
Last updated:2026-07-31
|
Calculation method:Formula-based calculation
|
Reference:hypotenuse = sqrt(legA * legA + legB * legB)
|Rounding & precision policy
Inputs Reference
  • Leg a (unit)
  • Leg b (unit)
Formula

hypotenuse = sqrt(legA * legA + legB * legB)

On This Page
  • Primary output (Hypotenuse)
  • calculatorInputsTitle
  • reverseSolveLabel
  • calculatorFormulaTitle
  • Computation graph
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Leg b
Leg b is a declared input for Pythagorean Theorem Calculator, measured in unit. Check this value and its unit before reusing the result.
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Methodology

Data & accuracy

Unit conversions follow SI and common measurement standards. We use careful numeric handling to reduce rounding surprises.

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Privacy policy
Hypotenuse decision comparison
  • Result chart
  • calculatorMultiOutputTitle
  • Common Questions
    • When is this mathematical calculation context enough?
    • What should I record with the result?
    • When should I use a specialized modifier?

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    Release 2.5Market: United States

    Primary output (Hypotenuse)

    Hypotenuse

    5

    Computed from default inputs using graph `synth-pythagorean-theorem`.

    Calculator inputs

    Leg a
    3 unit
    Leg b
    4 unit

    Reverse Solve

    Solve for Leg a

    Leg a: 3.7704 for Hypotenuse 5.5

    Formula and method

    Right-triangle hypotenuse formula.

    hypotenuse=legA⋅legA+legB⋅legB hypotenuse=\sqrt{ legA\cdot legA+ legB\cdot legB}hypotenuse=legA⋅legA+legB⋅legB​

    Computation graph

    1. hypotenusesqrt(legA * legA + legB * legB)

    Hypotenuse decision comparison

    Hypotenuse decision comparison

    itemvaluenote
    Stress low4Leg a: 0
    Downside4.83Leg a: 2.7
    Base case5Leg a: 3
    Upside5.19Leg a: 3.3000000000000003

    Result chart

    Visual Analysis1 series8 points

    Expanded chart built from the same sensitivity run as the table, so users can read the trend and verify the numbers in one place.

    Trend
    Upward
    Min

    How to use this calculator

    Calculate the hypotenuse of a right triangle.

    Pythagorean Theorem Calculator turns Leg a and Leg b into Hypotenuse. Confirm the units and assumptions match your situation before relying on the result.

    Pythagorean Theorem Calculator turns Leg a and Leg b into Hypotenuse with one documented method, so repeated runs stay comparable and arithmetic slips cannot creep in between them. Consistency matters most when several people need the same answer or when the result feeds a later calculation.

    Interpret the output against its assumptions: note which inputs you measured and which you estimated, then rerun with the estimated ones at their plausible high and low values. If the decision changes across that range, improve the input before acting — and where regulation, safety, or contract terms apply, treat the result as preliminary until formally validated.

    Academic performance optimization

    Important: Part-time work exceeding 20 hours/week is correlated with GPA decline (BLS data).

    Enter your values, then check the formula, scenarios, and FAQ to confirm the assumptions fit your case. For medical, financial, legal, or safety-critical decisions, treat the output as an estimate and verify it against the relevant professional standard.

    A result from Pythagorean Theorem Calculator is only as reproducible as its record: keep the exact inputs, their units, and the date alongside any output you share. Then rerun the case with your least certain input at its plausible high and low values — if the decision would change across that range, that input needs a better source before the number is fit to act on.

    Verify this result

    This answer is computed by CalculationEngine (v1.0.0). The same inputs always produce the same figure and the same fingerprint below, so you can reproduce and cite it.

    Assumptions

    • Scenariodefault inputs
    • Methodformula-graph evaluation
    • Formulahypotenuse = sqrt(legA * legA + legB * legB)

    Inputs & outputs

    • in · legA3
    • in · legB4
    • out · Hypotenuse5

    Related Tools

    Percentage Calculatorgraph

    Pythagorean Theorem Calculator context FAQ

    When is this mathematical calculation context enough?
    Use it when the result only depends on base value, comparison value, rate and no local rule changes the interpretation.
    What should I record with the result?
    Record the input values, base definition, rounding, order of operations, output unit, and rounding rule used in the calculation.
    When should I use a specialized modifier?
    Use a specialized modifier when base value, rounding precision, inverse formula, and interpretation wording materially changes how the same result should be explained.

    Worked Examples — Pythagorean Theorem Calculator

    ScenarioInputsResultInterpretation
    Squaring a deck frame with the 3-4-5 checkAlong side A: 3 ft mark; Along side B: 4 ft mark; Expected diagonal: 5 ftDiagonal = 5 ft exactly when the corner is 90°3² + 4² = 9 + 16 = 25 = 5², so a triangle with sides 3-4-5 is guaranteed right-angled. Mark 3 ft along one side and 4 ft along the other; if the diagonal between marks reads over 5 ft the corner is wider than square, under 5 ft it is tighter. Any multiple works — 6-8-10 or 9-12-15 spreads the same check over a larger frame, where a small angle error shows up as a bigger length error.
    How high a ladder reaches
    Math Calculators
    • Percentage Calculator
    • Tip Calculator
    Stress high6.02Leg a: 4.5
    4
    Max
    4.5177
    Insight
    Hypotenuse shows an upward pattern, with a visible peak around 2.1 at 4.5177.
    44.12944.25894.38834.517700.30.60.91.21.51.82.1
    X-axis: Leg aY-axis: Hypotenuse

    Visual response curve for Hypotenuse.

    Computation fingerprint (SHA-256)

    d5dd97ccac4575cada0b7504d064227662e765d10049f6b29abc714e50fdb2a3

    Ladder length (hypotenuse): 20 ft; Base distance from wall: 5 ft
    Reach height = √(20² − 5²) = √375 ≈ 19.4 ft
    Solving for a leg subtracts before taking the root: height = √(c² − b²). Adding by mistake gives √425 ≈ 20.6 ft — taller than the ladder itself, an impossible answer that flags the error. The 5 ft setback (a 1:4 ratio) costs only about 7 inches of reach.
    Actual width of a 55-inch TVScreen diagonal: 55 in; Aspect ratio: 16:9Width ≈ 47.9 in, height ≈ 27.0 inScreen sizes quote the diagonal. For 16:9, width = 55 × 16 ÷ √(16² + 9²) = 47.9 in and height = 27.0 in — check: √(47.9² + 27²) = 55. A '55-inch' TV therefore needs about 48 inches of shelf width, before the bezel.
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