# Calculators

> Sizing calculators for home water treatment: grain capacity, flow rate, micron rating and more, with the formula shown.

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| Source | https://ownerspec.com/water/calculators/ |
| Publisher | OwnerSpec (https://ownerspec.com/) |
| Published | 2026-09-11 |
| Updated | 2026-09-11 |

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Inputs you already have, one formula, one answer. Every calculator shows its working and
names the source the formula came from, so you can check it rather than trust it.

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Citation: OwnerSpec, "Calculators", https://ownerspec.com/water/calculators/, updated 11 September 2026.
Reuse: quoting with attribution and a link is permitted. See https://ownerspec.com/legal/terms/.