Pool alkalinity calculator: find how much baking soda (sodium bicarbonate) to add to raise total alkalinity from your current reading to your target. Enter the values shown in the calculator to get a practical planning estimate.
Free interactive calculatorWater Chemistry
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FREE ONLINE CALCULATOR
Baking Soda Pool Calculator
Estimate sodium bicarbonate needed to raise total alkalinity from a measured level to a selected target.
Na
YOUR ESTIMATE
Estimated baking soda amount
Planning estimate
Baking soda needed—pounds of sodium bicarbonate
Metric amount—kilograms
Alkalinity increase—ppm
Equivalent containers—at your selected size
Testing note: Sodium bicarbonate mainly raises total alkalinity and may change pH slightly. Retest after circulation before making another addition.
ABOUT THIS TOOL
What this calculator helps with
Water Chemistry
The baking soda pool calculator, also searched as a pool alkalinity calculator, estimates the sodium bicarbonate needed to raise total alkalinity (TA) from a measured value to a target. Enter the pool volume in gallons or litres plus your current and target alkalinity, and it shows pounds, kilograms and container counts.
Why this calculation matters
Total alkalinity buffers pool pH, so low alkalinity makes pH swing and corrosive water more likely. Baking soda is a common, inexpensive way to raise it. A fresh test result and an accurate pool volume make the adjustment easy to plan and help you avoid adding too much.
Details to have ready
Pool volume and the units used (gallons or litres).
The current total-alkalinity reading in ppm.
A target total alkalinity suited to your pool and sanitizer system.
The container or bag size you plan to buy.
How to prepare
Test total alkalinity first.
Confirm the pool volume.
Choose a sensible target for your pool system, using the chemical ranges guide if needed.
Add the baking soda in stages, circulate as directed and retest before another addition.
Note: The calculator uses an approximate sodium-bicarbonate dose relationship. Product labels and pool-specific water-care guidance should take priority.
CALCULATION GUIDE
How much baking soda raises pool alkalinity?
The calculator uses a common planning relationship for sodium bicarbonate: about 1.5 lb per 10,000 gallons for a 10 ppm increase in total alkalinity.
Baking soda (lb) ≈ Pool volume (gallons) ÷ 10,000 × (TA increase ÷ 10) × 1.5
For a 15,000-gallon pool increasing from 60 ppm to 90 ppm, the 30 ppm increase produces an estimate of 6.75 lb. The exact response depends on the water, product and test accuracy, so retest after circulation before making another change.
Baking soda and pool pH
Sodium bicarbonate is mainly used to raise total alkalinity and can raise pH slightly. It should not be treated as a replacement for a product intended specifically for a pH adjustment.
ALKALINITY CHART
Pool alkalinity chart: baking soda by pool size
Use this chart as a quick check of how much baking soda raises total alkalinity in common pool sizes. The calculator above does the same calculation for your own volume and readings.
Baking soda to raise total alkalinity (lb of sodium bicarbonate)
Pool size (US gal)
+10 ppm
+20 ppm
+30 ppm
+40 ppm
5,000
0.75 lb
1.50 lb
2.25 lb
3.00 lb
10,000
1.50 lb
3.00 lb
4.50 lb
6.00 lb
15,000
2.25 lb
4.50 lb
6.75 lb
9.00 lb
20,000
3.00 lb
6.00 lb
9.00 lb
12.00 lb
30,000
4.50 lb
9.00 lb
13.50 lb
18.00 lb
Uses about 1.5 lb per 10,000 gallons for each 10 ppm. Add large increases in stages and retest. Multiply pounds by 0.4536 for kilograms.
About 18 g of baking soda raises 1,000 litres of water by roughly 10 ppm of alkalinity. A 50,000 litre pool needing a 20 ppm increase would take about 1.8 kg. Change Volume units to litres in the calculator for an exact figure.
COMMON QUESTIONS
About Baking Soda Pool Calculator
How much baking soda should I add to my pool?
Enter pool volume, current total alkalinity and target alkalinity. The calculator uses about 1.5 lb of baking soda per 10,000 gallons for each 10 ppm increase. For example, raising a 15,000 gallon pool from 60 to 90 ppm takes about 6.75 lb.
How much baking soda raises alkalinity by 10 ppm?
A commonly used planning figure is about 1.5 lb per 10,000 gallons for a 10 ppm increase. The chart on this page shows the amount for common pool sizes and increases. Actual response varies, so retest before adding more.
What is a pool alkalinity calculator used for?
It estimates how much of a product is needed to move total alkalinity to a target. This one covers raising alkalinity with baking soda. To lower alkalinity, use the muriatic acid pool calculator.
What should my pool alkalinity be?
A common reference range for total alkalinity is about 80 to 120 ppm, although some pool types and sanitizer systems use a different range. See the pool chemical ranges guide before setting your target.
Does baking soda raise pool pH?
Sodium bicarbonate mainly raises total alkalinity and can raise pH slightly. Test both values before and after an adjustment and use the pool pH chart to interpret the pH reading.
Can I use baking soda in a pool measured in litres?
Yes. Change Volume units to litres and the calculator converts the volume for you, giving the result in both pounds and kilograms. As a rule of thumb, about 18 g of baking soda raises 1,000 litres by roughly 10 ppm.
How long should I wait before retesting alkalinity?
Run the pump so the baking soda dissolves and circulates, then retest after the time on the product label or after several hours. Large increases are usually made in more than one step.
Is baking soda the same as pool alkalinity increaser?
Pool alkalinity increaser is usually sodium bicarbonate, the same compound as baking soda. Check the label for the ingredient and any dosing directions.
What is a pool baking soda calculator used for?
A pool baking soda calculator estimates sodium bicarbonate for a measured total-alkalinity increase. It is also commonly searched as a pool alkalinity calculator.
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