pH Adjustment Calculator
Acid or base needed to shift pH.
Enter your values
Enter the volume in L.
Enter the current ph you are working with.
Enter the target ph you are working with.
Enter the reagent strength in mol/L.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Reagent needed
- 0.0001 L
- Moles required
- 0.00006
- Direction
- Add acid
- pH change
- 1
Quick answer
Shifting pH by one unit changes hydrogen ion concentration tenfold.
Δ[H+] = 10^−target − 10^−current
At a glance
| What it does | Acid or base needed to shift pH. |
|---|---|
| Category | Science |
| Inputs needed | Volume, Current pH, Target pH, Reagent strength |
| Main output | Reagent needed |
| Formula | Δ[H+] = 10^−target − 10^−current |
| Cost | Free — no sign-up, no download |
How to use the pH Adjustment Calculator
- 1Enter the solution volume.
- 2Enter current and target pH.
- 3Enter reagent molarity.
Inputs explained
- Volume(L)
- Enter the volume in L.
- Current pH
- Enter the current ph you are working with.
- Target pH
- Enter the target ph you are working with.
- Reagent strength(mol/L)
- Enter the reagent strength in mol/L.
Worked example
Using the values the calculator loads with:
Inputs
- Volume1000 L
- Current pH8.2
- Target pH7.2
- Reagent strength1 mol/L
Results
- Reagent needed0.0001 L
- Moles required0.00006
- DirectionAdd acid
- pH change1
Frequently asked questions
Why is my real dose higher?
Buffering capacity resists pH change — always dose gradually and retest.
Is this safe for pools?
Use it as a guide only and follow the product's dosing chart.
What do I need to enter into the pH Adjustment Calculator?
Just 4 values: volume, current ph, target ph, reagent strength. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the pH Adjustment Calculator work out the answer?
Shifting pH by one unit changes hydrogen ion concentration tenfold. It applies the formula Δ[H+] = 10^−target − 10^−current and shows the working so you can check each step by hand.
Is the pH Adjustment Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.