Life & fun · September 17, 2014
An Uncertainty Calculator
Calculate uncertainties easily with this calculator - Just use it like a normal one!
An Uncertainty Calculator launched on September 17, 2014 with 13 votes and more than 75% of that year's launches. The site was still online in September 2026, 12 years on.
In plain words
An Uncertainty Calculator helps users perform standard mathematical calculations while tracking measurement uncertainties. Designed for students and anyone working with real-world measurements, it allows users to input values and their associated absolute uncertainties using a dedicated button. The tool accounts for the reality that measurements cannot be infinitely precise, helping users understand and propagate measurement error through their calculations in an intuitive, familiar calculator interface.
written from the facts on this page · September 2026
From the sources
The only big difference is that you can click the ± button and then enter the (absolute) uncertainty for that value. In real life, you can't measure something perfectly. Take a moment to think about that. Take a ruler for example - you can measure that a pencil is 15cm long, you can probably measure that it's 15.1cm if you look closely. But can we say that the pencil is 15.100000cm long? No, we can't, because we aren't sure if all those 0's are actually 0, they could be 5's, of 9's or anything! So what can we do about this? This is where uncertainties come in. when we can say that the pencil is 15.1cm long plus or minus 0.05cm! What this means is that the actual length of the pencil…from ollyfg.github.io
Does a similar job
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Unsure Calculator – back-of-a-napkin probabilistic calculator2025 · filiph.github.io · ▲930The Unsure Calculator is an online tool that lets you calculate with numbers you’re not sure about.
- ATA Tool for Communicating Uncertainty2018 · uncertain.io · ▲17
Technical CalculatorNov 2025 · technical-calculator.com · ▲6100% free, reliable & accurate calculators
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Source: Show HN post ↗
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