---
title: "Water Treatment Unit Converter: LPH, GPD, m³/hr, TDS, Conductivity, Hardness | Filtsap"
description: "Convert LPH, LPM, m³/hr, KLD, GPD and GPM; TDS (ppm) and conductivity (µS/cm); and hardness in ppm CaCO₃, grains per gallon, °dH and °fH."
source: https://www.filtsap.com/tools/water-unit-converter/
updated: 2026-10-23
---

Free calculator

# Water treatment unit converter

Convert the units you meet in water treatment: flow (LPH, LPM, m³/hr, KLD, GPD, GPM), TDS and conductivity, and water hardness (ppm as CaCO₃, grains per gallon, German and French degrees).

## Result

Results appear here as you type.

## Conversion factors

- 1 m³/hr = 1,000 LPH = 16.67 LPM = 24 KLD = 4.403 US GPM = 6,340 US GPD.
- TDS (ppm) ≈ conductivity (µS/cm) × factor. The factor is 0.5 to 0.7 depending on the salts; 0.64 is a common default for natural water.
- 1 grain per US gallon = 17.12 ppm as CaCO₃; 1 °dH = 17.85 ppm; 1 °fH = 10 ppm.

Related: [TDS and conductivity meters](https://www.filtsap.com/monitor/water-quality-monitoring/) , [water softener calculator](https://www.filtsap.com/tools/water-softener-calculator/) , [RO plant calculator](https://www.filtsap.com/tools/ro-plant-calculator/) .

## FAQs

How many LPH is 100 GPD?

About 15.8 LPH, or roughly 380 litres per day.

How do I convert conductivity to TDS?

Multiply conductivity in µS/cm by a factor between 0.5 and 0.7. With 0.64, 1,000 µS/cm is about 640 ppm TDS.

What is 1 KLD?

One kilolitre per day, which is 1 m³ (1,000 litres) per day.

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