Ratio Calculator: Solve & Simplify Ratios Online | Free Tool

A Yes, you can use decimal numbers like 2.5:3.75 or fractions like 1/2:3/4. The tool solves proportions instantly regardless of format. Just type them in directly. One caveat: if you're simplifying a ratio with decimals, convert everything to whole numbers first by multiplying all terms by 10 or 100. That gives cleaner results.

A The tool will tell you if the ratio is proportional or not. For instance, entering 2:4 and 3:6 shows they match, so you get a confirmation. Type 2:4 and 3:5, and it flags the mismatch. No magic here — just a quick sanity check. Smart if you're double-checking work or grading.

A Absolutely. If the instructions say 3 parts cement to 1 part water (3:1) and you need 12 parts total, set the solver to 3:1 = ?:12. It tells you to use 9 parts cement and 3 parts water. Just keep the units consistent—liters, buckets, whatever. Pro tip: always add liquid gradually when mixing concrete, since the calculator assumes perfect ratios.

A Not at all. The calculator treats A:B = C:D as two pairs of related numbers. Just keep your logic consistent — if flour is always on the left, keep it there. Swap them for one calculation, and you'll get a different result (which might be right for a different problem). Pro tip: label your values mentally before typing. A common screw-up is flipping the order mid-calculation.

A That's exactly how it works. Type any three numbers into A:B = C:D, leave the last spot blank, and hit calculate. For example, if you know 3:5 = 12:?, the tool fills in 20 instantly. Common mistake: people accidentally leave more than one field empty, which won't work—the solver needs exactly one missing value. Tip: double-check your blanks before clicking.

A It shouldn't. A properly simplified ratio always uses whole numbers. If you're seeing decimals, you likely have numbers like 2.5:5 that need scaling first. Multiply every term by 2 to get 5:10, then simplify to 1:2. Our tool simplifies based on what you feed it, so feed it whole numbers for clean results. Tip: multiply by 10 or 100 to shift the decimal before simplifying.

A A ratio compares two quantities directly, like 1:4, while a percentage expresses one number as a fraction of 100. To convert 1:4 to a percentage, add the parts (1+4=5), divide the first part by the total (1/5=0.2), then multiply by 100—you get 20%. Many users ask because they're calculating body fat or loan interest, where percentages dominate. But ratios shine when you need relative proportions without a fixed base. Tip: use this tool to find the missing term in a ratio, then do the percentage math separately. Two quick steps beat one confusing formula.

A Input your home currency value on the left and the current exchange rate on the right. For example, typing 1 USD to 0.92 EUR sets your baseline. Leave the fourth box empty to calculate unfamiliar prices instantly. You'll avoid costly mental math at foreign markets. Tip: check rates daily since currency values fluctuate constantly.

A Yes, you can easily calculate shipping rates for different package weights. If sending a 2kg box costs $15, type 2:15 into the first half of the solver. Put your new 5kg package weight on the other side to find the exact postage price. This prevents you from overcharging customers at checkout. Tip: always round package weights up to the nearest hundred grams before typing.

A No, scaling numbers up keeps the exact same mathematical proportion every time. If you start with 2:3 and multiply both sides by 4, you get 8:12. Both inputs yield identical results when entered into this solver. Teachers often use this property to explain equivalent fractions to students. Tip: always multiply both sides by the exact same factor to avoid breaking your math.