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Exact helpers for the data-handling marks in practical questions. Everything runs in your browser; nothing you type is sent anywhere.
- Significant figures checkerCount the significant figures in any number, digit by digit, and round to any number of them.For example: 0.04050 → 4 s.f.
- Unit convertercm³ to dm³, g to kg, mm to µm, °C to K and more, with the multiply-or-divide rule shown.For example: 250 cm³ = 2.5 × 10⁻⁴ m³
- Mean without anomaliesSpot the anomalous repeat, leave it out and get the mean to the right number of decimal places.For example: 23.40, 23.60,
27.90→ 23.50 - Gradient from two pointsChange in y over change in x from two points on your line, with the unit and the intercept.For example: (2.0, 4.1) to (8.0, 16.3) → 2.03
- Percentage uncertaintyFrom a value and its uncertainty, from repeats or from a scale.For example: ±0.05 cm in 2.40 cm → 2.1 %