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Math & Scientific tool map

Arithmetic & algebra

Numbers, fractions, percentages, sequences, and equations.

Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.

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These tools cover the arithmetic that shows up in everyday decisions: percentages, fractions, averages, and powers of ten. Use the fraction calculator when you need exact, simplified results for adding, subtracting, multiplying, or dividing parts of a whole. For before-and-after comparisons, the percentage change calculator measures how far a value moved from its baseline, while the percentage increase calculator adds a known percent straight to an original value. When entries should not count equally — weighted grades, portfolio returns, lab repeats — reach for the weighted average calculator. More tools live in the Math & Scientific collection.

17 of 17 calculators

Arithmetic & algebra17 calculators

Average Percentage Calculator: Simple Mean of 2 to 5 Percentages

Find the average of two to five percentages, with the simple mean formula, equal-weight guidance, and when weighted totals are the honest answer.

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Verified

Binary to Hexadecimal Calculator

Convert binary numbers to hexadecimal and hexadecimal digits to binary while understanding four-bit grouping, base 2, base 16, padding, and width limits.

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Verified

Cross Product Calculator

Calculate the 3D cross product vector, components, and magnitude, with determinant derivation, right-hand-rule interpretation, units, and edge cases.

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Verified

Decibel Calculator: dB to Ratio & Combine Sound Levels

Convert decibels to power or amplitude ratios, convert ratios back to dB, and combine two sound levels with logarithmic formulas and safety context.

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Verified

Fraction Calculator

Popular

Add, subtract, multiply, and divide fractions with simplified results, mixed numbers, decimal values, denominator rules, and worked examples.

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Verified

Molarity Calculator

Popular

Calculate molarity from moles of solute and liters of solution, with amount concentration definition, units, lab cautions, and checked examples.

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Verified

Percent Off Calculator

Calculate sale price and savings from an original price and advertised percent-off discount, with clear formulas for markdowns, stacked deals, tax, and final cost.

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Verified

Percent to Goal Calculator

Calculate percent complete, remaining amount, percent remaining, and goal exceeded status for fundraising, savings, quotas, tasks, and measurable targets.

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Verified

Percentage Calculator

Popular

Calculate percent of a number, what percent one value is of another, and percent change with clear formulas, examples, domains, and interpretation.

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Verified

Percentage Change Calculator

Calculate percent increase or decrease from an original value to a new value, with absolute change and clear guidance on baseline, sign, and zero-value limits.

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Verified

Percentage Difference Calculator

Compare two values symmetrically with percentage difference, using the average baseline rather than an old or new value.

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Verified

Percentage Increase Calculator

Find the new value after adding a known percentage increase to an original value, with formulas, examples, edge cases, and comparison guidance.

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Verified

Random Number Generator

Popular

Generate pseudo-random integers or decimals within a chosen range, with optional no-duplicate draws for everyday sampling, games, and classroom examples.

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Verified

Scale Converter Calculator

Popular

Convert real-world measurements to model dimensions and model dimensions back to real size using a 1:X scale ratio and clearly labeled length units, with named presets for architectural drawing scales and model railroad scales.

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Scientific Notation Calculator & Converter

This scientific notation converter and calculator converts decimal numbers to scientific notation or expands scientific notation back to standard form, with E notation, exponent rules, examples, and edge-case guidance.

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Weighted Average Calculator

Perform a weighted average calculation (weighted mean) for grades, portfolios, lab measurements, survey scores, and any dataset where entries carry unequal importance.

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Weighted GPA Calculator

Calculate weighted and unweighted GPA from course grades and credits using clearly stated illustrative bonuses for honors and AP or IB courses.

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Verified

Frequently asked questions

What does the average percentage calculator do?
It calculates the simple arithmetic mean of two to five percentage values. Each entered percentage receives equal weight, so the calculator adds the selected percentages and divides by the number of values included in the calculator, then reports the result as a percent.
When is a simple average of percentages valid?
A simple average is valid when each percentage represents an equally important unit or the same denominator size. Examples include equally weighted assignments, repeated tests with the same maximum score, or monthly rates that you intentionally want to weight equally.
When should I not average percentages directly?
Do not directly average percentages that come from different denominators if each underlying observation should count equally. For example, averaging a class rate from 10 students with a class rate from 200 students gives the small class too much influence.

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Related comparisons

All Math & Scientific comparisons →
Average Percentage vs Statistics CalculatorCompare the average percentage and statistics calculators: one computes the equal-weight mean of a few percentages, the other summarizes a whole data set with spread and order statistics.Average Percentage vs Weighted AverageCompare the average percentage calculator's equal-weight mean of percentages with the weighted average calculator's mean weighted by importance, credits, or sample size.Binary vs Binary to HexadecimalCompare the multi-base Binary Converter with the focused binary-to-hexadecimal tool: four-base conversion with arbitrary-size unsigned integers versus dedicated four-bit nibble grouping with a 16-bit limit.Decibel Calculator vs Sound Level ConverterCompare the decibel calculator's logarithmic dB math — ratio conversion and combining sound levels — with the sound level converter's dB, phon, and sone loudness-scale translation.Long Division vs Fraction CalculatorCompare the long division and fraction calculators: one splits a whole-number division into quotient and remainder, the other performs exact fraction arithmetic with simplified results.Matrix vs Cross Product CalculatorCompare the matrix calculator and the cross product calculator: 2 by 2 matrix operations for transformations and grids versus a perpendicular 3D vector product for normals and torque.Molarity Calculator vs PPM CalculatorCompare molarity, the amount of solute per liter of solution in mol/L, with ppm, a dimensionless parts-per-million ratio, for chemistry concentration questions.Noise Exposure vs Decibel CalculatorCompare noise exposure and decibel calculators: one totals occupational noise dose under a chosen OSHA or NIOSH criterion from levels and durations, the other converts dB to ratios and combines sound levels logarithmically.Percent Off vs PercentageCompare the percent off and percentage calculators: a sale-price-and-savings tool built from a discount rate versus a general percent-of, part-of-whole, and percent-change tool.Percentage Calculator vs Percent to GoalCompare the general percentage calculator with the percent to goal calculator: percent-of, ratio, and percent-change math versus progress-toward-a-target tracking.Percentage Change vs Percentage DifferenceCompare percentage change, which divides by the original value and reports direction, with percentage difference, which divides the gap by the average of two equal-status values.Percentage Increase vs Percent OffCompare the percentage increase calculator — a known percent added to an original value — with the percent off calculator — a discount subtracted from a price.Percentage Increase vs Percentage ChangeCompare the percentage increase and percentage change calculators: applying a known percent to a starting value versus solving for the signed percent between an old and a new value.Percentage Increase vs Percentage DifferenceCompare the percentage increase calculator's forward arithmetic — applying a known percent to a starting value — with the percentage difference calculator's symmetric gap between two equal-status values.Percentage vs Average PercentageCompare the all-in-one percentage calculator with the average percentage calculator: solving percent-of, what-percent, and percent-change questions versus combining several percentages into an equal-weight mean.Percentage vs Fraction CalculatorCompare the percentage calculator and fraction calculator: percent-of, ratio, and percent-change problems versus exact fraction arithmetic with simplified results and mixed numbers.Percentage vs Percentage ChangeCompare the all-in-one percentage calculator with the focused percentage change calculator: percent of a number, what percent one value is of another, and before-and-after change.Percentage vs Percentage Difference CalculatorCompare the percentage calculator's part-whole and change questions with percentage difference's symmetric average-baseline gap between two equal-status values.Percentage vs Percentage Increase CalculatorCompare the percentage calculator and the percentage increase calculator: percent-of, ratio, and percent-change problems versus forward increases applied to a known original value.Percentage vs Weighted AverageCompare the percentage calculator and the weighted average calculator: when a simple percent relation answers the question versus when values must be counted in proportion to their importance.Random Number Generator vs Statistics CalculatorCompare the random number generator for drawing pseudo-random values within a chosen range against the statistics calculator for summarizing an existing data set with mean, median, mode, and spread.Scale Converter vs Measurement ConverterCompare the scale converter and measurement converter: proportional real-to-model scaling at a 1:X ratio versus direct unit conversion across length, area, mass, volume, time, and speed.Scientific Notation vs Number to MillionCompare representing large numbers as a coefficient times a power of ten with scaling them into million, billion, and thousand labels — exact notation versus human-readable reporting scale.Statistics vs Weighted Average CalculatorCompare statistics and weighted average: the statistics calculator summarizes a data set with mean, median, mode, and spread, while weighted average counts some values more than others.Weighted Average vs Weighted GPA CalculatorCompare weighted average and weighted GPA: one computes a mean with arbitrary values and weights, the other applies the same idea to course grades, credits, and honors or AP/IB boosts.

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