Salt to reach 3,200 ppm (from 0 ppm)
Fresh fill| Pool size (US gal) | Liters | Salt (lb) | Salt (kg) |
|---|---|---|---|
| 5,000 | 18,927 | 134 | 61 |
| 10,000 | 37,854 | 267 | 121 |
| 15,000 | 56,781 | 401 | 182 |
| 20,000 | 75,708 | 534 | 242 |
| 25,000 | 94,635 | 668 | 303 |
| 30,000 | 113,562 | 801 | 363 |
Pool Salt Calculator
How much salt should you add to your saltwater pool? Enter your pool volume, current salt reading and target salinity to find the exact amount of pool-grade salt to add — or, if your pool is over-salted, how much water to drain and refill to bring it back to the ideal 3,200 ppm.
Created by
Daniel Whitman
Reviewed by
Hannah Brooks
Pool salt calculator
≈ 37854 liters
Read this from your chlorine generator or a digital salinity meter.
Recommended: 2,700 – 3,400 ppm. Ideal: 3,200 ppm.
Salt to add
100lb
≈ 45.4 kg · about 2.5 × 40 lb bags
- Pool volume37854 L
- Concentration to add+1200 ppm
- Salt mass45.4 kg / 100 lb
Use pool-grade NaCl (≥99% pure, non-iodized, no anti-caking agents). Run the pump for 24 hours after adding, then re-test before adding more.
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How this pool salt calculator works
Salt concentration in a pool is measured in parts per million (ppm) — the milligrams of salt per liter of water. To raise your pool from one ppm to another, the calculator multiplies your pool volume (converted to liters) by the difference between your current and desired salt levels, then divides by one million. The result is shown in both pounds and kilograms, plus a handy estimate of how many 40-lb bags of pool-grade salt to buy.
The exact formula: salt (kg) = volume (L) × (desired ppm − current ppm) ÷ 1,000,000. If your current reading is higher than the desired level, salt cannot be chemically removed — the calculator switches to water-replacement mode and tells you what fraction of the pool to drain and refill with fresh water: replace fraction = 1 − desired ÷ current.
The acceptable range for a saltwater pool is 2,700–3,400 ppm, with 3,200 ppm being the ideal value most chlorine generators are tuned for. Always run the pump for 24 hours after adding salt and re-test before adding more.
Pool salt reference tables
Quick-glance tables for the most common questions: how much salt for a fresh fill, how much to top up a typical 10,000-gal pool, the safe salinity range, and unit conversions for any pool-volume measurement.
10,000 US gal pool → 3,200 ppm
Top-up| Current ppm | Add (lb) | Add (kg) | 40 lb bags |
|---|---|---|---|
| 0 | 267 | 121 | 6.7 |
| 500 | 225 | 102 | 5.6 |
| 1,000 | 184 | 83 | 4.6 |
| 1,500 | 142 | 64 | 3.5 |
| 2,000 | 100 | 45 | 2.5 |
| 2,500 | 58 | 26 | 1.5 |
| 2,700 | 42 | 19 | 1.0 |
| 3,000 | 17 | 8 | 0.4 |
Saltwater pool salinity bands
Range| Salt level | Status | What it means |
|---|---|---|
| < 2,700 ppm | Too low | Generator under-produces chlorine — algae risk |
| 2,700 – 3,000 ppm | Acceptable | Lower end of recommended band |
| 3,200 ppm | Ideal | Sweet spot for most chlorine generators |
| 3,000 – 3,400 ppm | Acceptable | Upper end — re-test before adding more |
| > 3,400 ppm | Too high | Salty taste, corrosion — dilute with fresh water |
Pool volume unit conversions
Convert| Unit | In liters | In US gal |
|---|---|---|
| 1 US gal (US gallons) | 3.7854 L | 1 |
| 1 UK gal (UK gallons) | 4.5461 L | 1.2009 |
| 1 L (liters) | 1 L | 0.2642 |
| 1 m³ (cubic meters) | 1,000 L | 264.1721 |
| 1 cu ft (cubic feet) | 28.3168 L | 7.4805 |
Frequently asked questions
What is the ideal salt level for a saltwater pool?
The acceptable range is 2,700–3,400 ppm, with about 3,200 ppm being the sweet spot most chlorine generators target. The calculator above defaults to 3,200 ppm.
How much salt do I add to a 10,000-gallon pool?
Roughly 267 lb (121 kg) of salt to take a fresh 10,000-gallon pool from 0 to 3,200 ppm. From 2,000 ppm you'd only need about 100 lb.
What if my salt level is already too high?
Salt can't be removed — you have to dilute it. The calculator tells you exactly how much water to drain and refill to bring the level back to your target.
What kind of salt should I use?
Use pool-grade sodium chloride at ≥99% purity, non-iodized, with no anti-caking or rust-inhibitor additives.
How long does it take for added salt to register?
Run the pump for 24 hours after adding salt, then re-test with a meter or strip. Generator readings stabilize once the water has fully circulated.
Is this pool salt calculator free?
Yes — free, no account, runs in your browser. For commercial pools, follow your pool professional. Have feedback? Contact the team.
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