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Minimum spanning tree calculator

The cheapest way to connect every node of a weighted graph with no cycles — the classic problem behind laying cable, roads or pipes. List the edges as “A B weight” and Kruskal's algorithm finds the minimum spanning tree, its total weight, and draws it, highlighting the chosen edges.

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Open Minimum spanning tree calculator and you get an answer straight away, with no account to create. You will find it under Discrete maths & graphs, with Find minimum and maximum and Bitwise Calculator for the neighbouring cases.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Minimum spanning tree calculator do?

The cheapest way to connect every node of a weighted graph with no cycles — the classic problem behind laying cable, roads or pipes. List the edges as “A B weight” and Kruskal's algorithm finds the minimum spanning tree, its total weight, and draws it, highlighting the chosen edges.

What does a concrete case look like?

A–B 1, B–C 2, A–C 3 → A–B–C, Σ = 3 — the tool shows every step in between, not just the final figure.

When would I actually use this?

Anything modelled as points and connections: a shortest route, a network's capacity, a schedule with dependencies, or a circuit reduced to its logic.

What is the most common mistake?

Assuming a shortest path stays shortest when a weight changes sign. Negative edges break the greedy argument Dijkstra rests on, and the algorithm returns a confident wrong answer rather than an error.

How is Minimum spanning tree calculator different from Find minimum and maximum?

They sit next to each other but answer different questions: Find minimum and maximum is the one to open when you need it to paste a list of numbers and get the smallest, the largest, the range between them, and how many values there are. Handles negatives and decimals. Pick whichever matches what you're starting from — both are free.

Where do the figures come from?

The algorithms are the textbook ones and their results are exact for the graph you enter. What varies is cost: several of these problems have no known efficient solution, so large inputs are answered by heuristic and the tool says when that is the case.

Further reading

All guides →
ExplainerThe Flat Pattern of a Cone Is a Sector, Not a CircleRoll a 50 mm cone 80 mm tall and its pattern is a 190.8° slice of a 94 mm circle. Flatten a nearly cylindrical lampshade and the pattern radius runs to 839 mm — the shallower the taper, the further away the apex.ExplainerA 1 % Drop Rate Does Not Mean One Hundred RunsAt 1 %, a hundred attempts give you 63.4 % — not certainty. Ninety per cent takes 230 attempts and ninety-nine takes 459, and more than a third of players are still empty-handed at a hundred.ExplainerFibonacci and the Golden RatioThe Fibonacci sequence adds each pair of terms to make the next; the ratio of neighboring terms homes in on the golden ratio φ ≈ 1.618. See how, and where the pattern turns up.ExplainerWhat Is a Z-Score? Standard Deviations Above the MeanA z-score is z = (x − μ) / σ — how many standard deviations a value sits from the mean. Learn how to compute it, read the standard normal curve, and turn it into a percentile.How-toHow to Find the Distance Between Two PointsUse the distance formula d = √((x₂−x₁)² + (y₂−y₁)²) to measure the straight-line distance between two points on a plane, with a worked example and the midpoint too.How-toHow to Calculate the Slope of a Line: Rise Over RunFind the slope of a line from two points with m = (y₂ − y₁) / (x₂ − x₁), and read what a positive, negative, zero, or undefined slope tells you.