Choose a ratio, a percent strength or the C1V1 = C2V2 formula, enter the volume you want to make, and get the exact amounts of concentrate and water in the units you use.
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A label that says 1:10 usually means 1 part concentrate to 10 parts water, which makes 11 parts in total. That's the default here. Some industries, especially photography and labs, write 1:10 to mean 1 part in 10 total, so the calculator lets you choose. Percent mode uses the relationship between strengths: to make 5% from a 100% concentrate, one-twentieth of the final volume is concentrate. The C1V1 = C2V2 formula generalizes this. The starting concentration times its volume equals the final concentration times the final volume, so you can solve for whichever value is missing.
Always add concentrate to water rather than water to concentrate for strong chemicals, wear gloves and eye protection, and never mix bleach with ammonia or acids.
Common sizes are 16 fl oz (473 ml), 24 fl oz (710 ml), 32 fl oz (946 ml) and 500 ml or 1 L in metric countries.
With 1 part concentrate to 10 parts water, you need 32 ÷ 11 ≈ 2.9 fl oz of concentrate and about 29.1 fl oz of water.
Not quite. 1 part in 11 total is about 9.1%. Only the "1 in X total" convention makes 1:10 exactly 10%.
The starting concentration times the starting volume equals the final concentration times the final volume. Any one unknown can be solved from the other three.
No. Adding water only makes a solution weaker, so the target strength must be lower than the stock.
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