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Mixing Ratio Calculator

The Mixing Ratio Calculator determines exact amounts of each component when combining materials at a specified ratio. Enter a mixing ratio like 3:1:1 and total volume to get precise measurements — perfect for paint mixing, epoxy, concrete, resin, and chemical solutions.

Mixing Ratio Calculator — Live Preview
Component Amounts
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Widgets

Quick interactive ratio calculators — solve proportions, scale values, and simplify ratios.

Proportion Solver

Provide any three values below to calculate the fourth in the ratio A : B = C : D.

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Solved Proportion
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Simplified
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Percentages
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Decimal
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Fraction
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Visual Ratio
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    Scale Multiplier

    Scale a ratio up or down by a multiplier.

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    Scaled Ratio
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    Original
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    Factor
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    Percentages
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    Visual Ratio
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      Simplifier

      Reduce any ratio to its simplest form.

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      Simplified Ratio
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      GCD Used
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      Fraction
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      Visual Ratio
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        What is a Mixing Ratio?

        A mixing ratio specifies the proportional amounts of each component in a mixture. A 3:1 epoxy ratio means 3 parts resin to 1 part hardener by volume or weight. Accurate mixing ratios are critical — incorrect proportions can cause epoxy that never cures, paint that won't dry, or concrete that crumbles.

        Mixing ratios appear in automotive paint (4:1:1 base:reducer:hardener), construction (1:2:3 cement:sand:gravel), bartending (2:1 spirit:mixer), and chemical manufacturing. Some ratios are by volume and others by weight — always check which unit the ratio references.

        Formulas & Equations Used

        This Mixing Ratio Calculator uses the following core equations:

        1 Component Amount ▼
        Component = Total Amount × (Part / Sum of All Parts)

        For 3:1 ratio and 1 gallon total: Part A = 1 gal × (3/4) = 0.75 gal; Part B = 1 gal × (1/4) = 0.25 gal.

        2 Total from Component ▼
        Total = Known Component × (Sum of Parts / Component Parts)

        If Part A is 600ml and ratio is 3:1: Total = 600 × (4/3) = 800ml.

        3 Three-Part Mix ▼
        Part_i = Total × (Ratio_i / (Ratio_1 + Ratio_2 + Ratio_3))

        For 4:1:1 and 3 liters: Part A = 3 × (4/6) = 2L; Parts B&C = 0.5L each.

        How to Use This Mixing Ratio Calculator

        Follow these 3 simple steps:

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        Enter Your Values

        Type the known values into the input fields above. The Mixing Ratio Calculator accepts any positive numbers.

        2

        Choose Calculation Mode

        Select Solve, Simplify, or Scale mode in the calculator. Each applies different equations to your inputs.

        3

        View Results

        Click Calculate to see your answer with a visual ratio bar, pie chart, and step-by-step solution breakdown.

        Example Problems & Step-by-Step Solutions

        Here are 3 worked examples using this Mixing Ratio Calculator:

        Example 1 Mix 2-part epoxy at 3:1 ratio for 500ml total
        1 Total parts: 3 + 1 = 4
        2 Resin: 500 × (3/4) = 375 ml
        3 Hardener: 500 × (1/4) = 125 ml
        ✓ 375 ml resin + 125 ml hardener = 500 ml epoxy
        Example 2 Automotive paint: 4:1:1 ratio, need 800ml
        1 Total parts: 4 + 1 + 1 = 6
        2 Base coat: 800 × (4/6) = 533.3 ml
        3 Reducer: 800 × (1/6) = 133.3 ml
        4 Hardener: 800 × (1/6) = 133.3 ml
        ✓ 533 ml base + 133 ml reducer + 133 ml hardener
        Example 3 Mortar mix: 1:3 cement to sand, 50 kg cement available
        1 Ratio 1:3, cement is 1 part
        2 Sand needed: 50 × 3 = 150 kg
        3 Total mix: 50 + 150 = 200 kg
        ✓ 50 kg cement + 150 kg sand = 200 kg mortar

        Frequently Asked Questions

        How do I calculate a mixing ratio? ▼

        Divide each component amount by the smallest amount. If you mix 750ml of A with 250ml of B: divide both by 250 to get 3:1. This simplification gives you the ratio in its simplest form.

        Is mixing ratio by weight or volume? ▼

        It depends on the product. Epoxy and paint ratios are usually by volume. Concrete and food ratios may be by weight. Always check the product label — mixing by the wrong unit can cause failures.

        What happens if I mix epoxy at the wrong ratio? ▼

        Incorrect ratios cause incomplete curing. Too much resin leaves a sticky, soft surface. Too much hardener creates a brittle, yellowed result. Most epoxies have very little tolerance — stay within 5% of the specified ratio.

        How do I convert a mixing ratio to percentage? ▼

        Divide each part by the total. A 3:1 ratio = 3/4 = 75% Part A and 1/4 = 25% Part B. A 5:3:2 ratio = 50% + 30% + 20%.

        Can I scale a mixing ratio up or down? ▼

        Yes. Multiply all parts by the same factor. If 3:1 uses 300ml + 100ml, doubling gives 600ml + 200ml. The ratio stays 3:1 regardless of total volume.

        Learn About Ratios

        What is a ratio?

        A ratio is a comparison between two or more quantities showing the relative size of one to another. Written as A : B, it means 'for every A units of the first quantity, there are B units of the second.' For example, a ratio of 3 : 4 means for every 3 parts of A, there are 4 parts of B. Ratios are used in cooking, construction, finance, science, and everyday life.

        How do I solve a proportion?

        A proportion is an equation that says two ratios are equal: A : B = C : D. To solve for a missing value, use cross-multiplication. If D is unknown: D = (B × C) / A. This works because in equal ratios, the cross products are always equal: A × D = B × C. Our Proportion Solver does this automatically — just enter any 3 values and it finds the 4th.

        How do I simplify a ratio?

        To simplify a ratio, find the Greatest Common Divisor (GCD) of both numbers and divide each by it. For example, 24 : 36 — the GCD of 24 and 36 is 12. So 24 ÷ 12 = 2 and 36 ÷ 12 = 3, giving the simplified ratio 2 : 3. Our Simplifier automatically finds the GCD and reduces your ratio to its lowest terms.

        What is ratio scaling and when is it useful?

        Scaling a ratio means multiplying both parts by the same factor to create an equivalent, larger (or smaller) ratio. For instance, scaling 2 : 5 by a factor of 3 gives 6 : 15. This is extremely useful for recipes (tripling a recipe), construction (scaling blueprints), mixing solutions, or any scenario where you need to maintain the same proportion at a different magnitude.

        What's the difference between a ratio and a fraction?

        A ratio A : B compares two quantities to each other (part-to-part), while a fraction A/B typically represents a part-to-whole relationship. However, any ratio can be expressed as a fraction: 3 : 4 is equivalent to 3/4 = 0.75. The key difference is context — ratios compare quantities side-by-side, while fractions represent a portion of a total.