Dilution Ratio Calculator
Calculate exact concentrate and water amounts for any dilution ratio. Enter a ratio like 1:10, 1:32, or 1:128 with your desired total volume to get precise milliliter measurements — perfect for cleaning products, chemical solutions, laboratory serial dilutions, and agricultural spray mixing.
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What is a Dilution Ratio?
A dilution ratio specifies the proportion of concentrated substance (solute) to be mixed with a diluent, typically water. In a 1:10 dilution, one part concentrate is mixed with ten parts water, yielding eleven total parts of solution. The ratio controls the final concentration — getting it right ensures effectiveness for cleaning, safety for chemical handling, and accuracy for laboratory analyses.
Dilution ratios are essential across numerous fields: janitorial cleaning (1:32 to 1:128 for floor cleaners), agriculture (1:100 to 1:500 for pesticide sprays), medical laboratories (serial dilutions for blood titers and bacterial counts), photography (1:4 to 1:9 for film developers), food service (juice concentrates), and industrial manufacturing (coolant mixing). Incorrect dilution wastes product, reduces effectiveness, or creates dangerous concentrations.
使用される計算公式・方程式
この計算ツールは5つの主要な公式を使用しています：
1 Concentrate Amount ▼
For 1:10 dilution of 1 liter total: Concentrate = 1000ml / (10+1) = 90.9 ml.
2 Water Amount ▼
For 1 liter at 1:10: Water = 1000 - 90.9 = 909.1 ml.
3 Serial Dilution ▼
Starting at 1M with three 1:10 dilutions: Final = 1 × (1/10)³ = 0.001 M.
Explore all calculation options on the 比率計算ツール home page.
比率計算ツールの使い方
この比率計算ツールは、以下の3ステップで簡単にご利用いただけます：
数値を入力
入力欄に既知の比率の値を入力します。求めたい未知数の入力欄は空欄のままにしておきます。
モードを選択
比率モード（解く、簡素化、スケーリング）を選択します。各モードで異なる計算式が適用されます。
結果を確認
計算するボタンを押します。結果画面に答えと、視覚的な比率バー、円グラフ、詳細なステップバイステップの解決プロセスが表示されます。
実例問題と段階的な解説
本比率計算ツールを使って、以下の3つの例題をステップバイステップで解決するプロセスです：
入力 1 Mix 1:20 dilution of cleaner for 5 liters
入力 2 1:4 developer solution for 500ml total
入力 3 Serial dilution: 3 steps of 1:10 from 0.5M
よくある質問 (FAQ)
What does a 1:10 dilution ratio mean? ▼
A 1:10 ratio means 1 part concentrate mixed with 10 parts water, giving 11 total parts. To make 1 liter at 1:10: use 90.9 ml concentrate and 909.1 ml water. The resulting solution contains 9.09% concentrate by volume.
How do I convert a dilution ratio to percentage? ▼
Divide 1 by the total number of parts and multiply by 100. A 1:20 dilution = 1/(20+1) × 100 = 4.76% concentrate. A 1:4 dilution = 1/(4+1) × 100 = 20% concentrate. The total parts is always the ratio number plus one.
What is the difference between 1:10 and 1/10 dilution? ▼
In common/commercial usage, 1:10 means 1 part concentrate to 10 parts water (11 total parts, 9.09% strength). In scientific notation, a 1/10 dilution means 1 part in 10 total parts (1 part concentrate + 9 parts water, 10% strength). The difference is small but matters for precision work.
How do I dilute concentrated bleach for disinfecting? ▼
For general disinfection with regular 5.25-6% sodium hypochlorite bleach, the CDC recommends 1:48 (1 tablespoon per quart of water, ~1000 ppm chlorine). For heavy contamination or bloodborne pathogens, use 1:10 (~5000 ppm). Always verify your bleach concentration and check current CDC guidelines.
What is a serial dilution? ▼
A serial dilution performs multiple dilution steps sequentially. Each step dilutes by the same factor. Three 1:10 dilutions produce a total 1:1000 dilution (10 × 10 × 10). This technique is used in microbiology to count bacteria, in immunology for antibody titers, and in pharmacology for dose-response curves.
How much concentrate do I need for a 5-gallon bucket at 1:32? ▼
Five gallons = 640 oz. At 1:32 (33 total parts): Concentrate = 640 ÷ 33 = 19.4 oz. Water = 640 - 19.4 = 620.6 oz. So pour approximately 19.4 oz of concentrate into your bucket and fill with water to 5 gallons total.
What is C₁V₁ = C₂V₂? ▼
This is the dilution equation where C₁ = initial concentration, V₁ = volume of concentrate, C₂ = desired final concentration, V₂ = desired final volume. To dilute a 10% solution to 2% using 500ml: 10% × V₁ = 2% × 500ml, so V₁ = 100ml concentrate + 400ml water.
How do I make a 1:128 dilution for my floor cleaner? ▼
For 1 gallon (128 oz) at 1:128: Total parts = 129. Concentrate = 128 ÷ 129 ≈ 0.99 oz (approximately 1 oz or 2 tablespoons). Water = 128 - 0.99 = 127 oz. This is the standard dilution for many commercial quaternary disinfectant concentrates.
Can I mix different chemicals after diluting them? ▼
Never mix different chemicals without consulting their Safety Data Sheets (SDS). Some common combinations are dangerous — bleach + ammonia produces toxic chloramine gas, bleach + acid produces chlorine gas. Even mixing different commercial cleaners can create hazardous reactions.
How long does a diluted cleaning solution last? ▼
Most diluted cleaning solutions remain effective for 24-48 hours. Quaternary disinfectants may last up to 7 days if the container remains closed. Diluted bleach loses effectiveness within 24 hours. Always check the product label for specific shelf-life guidance after dilution.
What dilution ratio should I use for hand sanitizer? ▼
WHO-recommended hand sanitizer formulas use 80% ethanol or 75% isopropyl alcohol (approximately a 4:1 alcohol-to-water/glycerol ratio). Using less alcohol reduces effectiveness. Do not dilute commercial hand sanitizers below their labeled concentration.