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Math Calculators
Last updated: October 7, 2026
Percentages, fractions, ratios, quick math without the textbook.
Math calculators are the most-searched category in this entire site, and for good reason, everyone needs to calculate a percentage, convert a fraction, or work out a tip from time to time, and nobody enjoys doing it on paper. CalcHive's math tools are built for those exact moments.
Each calculator gives the answer instantly and then shows the work below, useful if you're a student trying to learn the method, or a parent helping with homework, or just someone who wants to double-check the math. No login, no "upgrade for step-by-step," no ads on top of the answer.
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How to choose a math calculator
Percent questions look alike and are not. If you have an original price and a discount percent, use percent off. If you have two values and want the change as a percent of the first, use percent change. If you are adding a percent to a restaurant bill, use the tip calculator. If you only need to rewrite a fraction as a decimal or a percent, use the converter. A ratio, an average, and a GPA are the other three tools, and none of them is a percent in disguise. The tip calculator lives here under Math. It is not in the DIY section.
The seven tools
The Fraction, Decimal, and Percent Converter rewrites a single number among those three forms. Use it when the homework or the recipe already gives you one form and you need another. It does not compare two prices. Half, double, and a third of common cup and tablespoon amounts are listed on the recipe halving, doubling, and thirding chart. This converter does not scale a recipe.
The Percent Change Calculator computes ((new − old) ÷ old) × 100. The old value is the base. A 25 percent increase does not undo with a 25 percent decrease, because the base moved. If the old value is zero, the percent is undefined and the page says so.
The Percent Off Calculator turns an original price and a discount percent into a sale price and the dollars saved. Stacked discounts have to be run one at a time, because the second percent applies to the sale price, not to the original. Tax and shipping are not included.
The Tip Calculator multiplies a bill by a tip percent and can split the total across people. Enter the pre-tax subtotal or the post-tax total depending on which base you tip on. It will not decide the custom for you. Check the receipt for a gratuity that is already included before you add another percent.
The Average and Median Calculator gives the mean and the median of a list you paste. The mean moves with outliers. The median stays with the middle value. A weighted average, including a GPA, is not what this page computes.
The Ratio Calculator simplifies a ratio, scales it, or splits a quantity in a given proportion. Order matters: 2:3 is not 3:2. Use it for mixes, screen sizes, and shares of a bill when the shares are not equal.
The GPA Calculator combines course grades and credits into a grade-point average. Use it for a term or a cumulative set of courses. Comparing two test scores as a percent is percent change, not a GPA.
Percents that look alike and are not
Start from the sentence, not from the percent sign. "This was $80 and now it is $100" is percent change: (new − old) ÷ old × 100, and a 25 percent rise does not undo with a 25 percent drop because the base moved. "Take 20 percent off $80" is percent off: the discount comes off the original price, and a second discount has to be run again because it applies to the sale price. "Add 20 percent to this restaurant bill and split it" is the tip calculator. It rounds every dollar line to the nearest dollar, so 15 percent of $50, which is $7.50, displays as $8. The 20 in its tip box is a placeholder, not a rule. Rewriting 3/8 as a decimal or a percent, with no second number to compare, is the fraction converter.
The other three tools are not percents in disguise. The average page gives the mean and the median of a list you paste, each value counting once. A comma inside 1,000 splits it into 1 and 0. It will not weight a 4-credit class above a 1-credit class. That is the GPA calculator. The ratio page simplifies a pair, scales one side, and reports A as a percent of B. For 3 and 5 that percent is 60, meaning 3 ÷ 5, not 3 ÷ 8. It will not split a dollar total. The tip tool's split is equal shares only.
The tip calculator is under Math. It is not in DIY. If a page you remember from somewhere else sent you looking for a tip splitter among the paint and lumber tools, come back here.
FAQ
Which percent tool do I want?
Percent change compares two values and uses the first as the base. Percent off takes a discount off one price. The tip calculator adds a percent to a bill and can split the total equally. The fraction converter rewrites a single number. They are not interchangeable.
Does the average page weight grades by credits?
No. Every number you paste counts once. A comma inside a thousands separator splits the value. Credit-weighted grades are the GPA calculator.
The ratio page shows 60 percent for 3:5. Is that each person's share?
No. That percent is the first number divided by the second. Three is 60 percent of five. The page does not divide by 3+5, and it does not split a pile of dollars.
Why does the tip tool hide cents?
Each dollar line rounds to the nearest dollar. Fifteen percent of $50 is $7.50 and displays as $8. The grand total of $57.50 displays as $58. Type the percent you mean. The 20 already in the box is a placeholder.
Where is the tip splitter?
Under Math, on the tip calculator. It is not a DIY tool. The split is equal. An unequal ratio is not computed on the ratio page either. That page only simplifies and scales a pair of numbers.
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