How do I simulate a tolerance check?

Open this page and use the live Tolerance Stack-Up tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.

Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.

Can I use my own numbers?

Absolutely — every input is adjustable, and with data import you can drive a tolerance check from your own measurements.

Use case · powered by Tolerance Stack-Up

Tolerance Stack-Up for a tolerance check

Simulate a tolerance check live in your browser. This runs the real Tolerance Stack-Up solver — adjust the inputs, watch it respond instantly, and export the result. No install, no account.

For:Students Researchers Educators Engineers Hobbyists & Makers K-12 Students First Responders

Tolerance Stack-UpLive

worst-case vs statistical

Controls

Presets

Number of parts

Tolerance per part (±mm)

When parts stack in an assembly, their tolerances accumulate. Worst-case analysis simply adds them — safe but pessimistic, since all parts rarely hit their extremes together. Statistical (root-sum-square) analysis adds them in quadrature, giving a much tighter, more realistic range. Choosing between them decides how much precision — and cost — each part really needs.

▶ Run in Python

Data Inspector

Worst-case total±0.50 mm

Statistical (RSS)±0.22 mm

RSS savings55% tighter

Governing equation

T_{w c} = \sum ∣ t_{i} ∣ = 5 \times 0.1 = 0.50, T_{r ss} = \sum t_{i}^{2} = 0.1 5 = 0.22 mm

Reading this result: Across 5 parts, RSS (±0.22 mm) is 55% tighter than the worst-case ±0.50 mm — enough headroom to relax individual part tolerances and cut cost.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

or unlock everything with Pro →

About this simulation

The full Tolerance Stack-Up tool models a tolerance check with the same numerics engineers and scientists use — running entirely client-side. Change any parameter and the result updates in real time, so you can build intuition, check a design, or teach the concept without spreadsheets or installs.

More you can do with Tolerance Stack-Up

Tolerance Stack-Up for a CNC part Tolerance Stack-Up for an assembly line Tolerance Stack-Up for an injection mold Tolerance Stack-Up for a 3D print Tolerance Stack-Up for a welding cell Tolerance Stack-Up for a paint booth Tolerance Stack-Up for a packaging line Tolerance Stack-Up for a bottling plant

Other ways to simulate a tolerance check

Process Capability for a tolerance check OEE for a tolerance check CNC Feeds & Speeds for a tolerance check Line Balancing for a tolerance check SPC Control Chart for a tolerance check Learning Curve for a tolerance check

Frequently asked questions

How do I simulate a tolerance check?: Open this page and use the live Tolerance Stack-Up tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.
Is it free?: Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.
Can I use my own numbers?: Absolutely — every input is adjustable, and with data import you can drive a tolerance check from your own measurements.