NumLuma›Calculators›Math, Ratio & Percentage Calculators

Solve everyday math

Math, Ratio & Percentage Calculators

This collection covers the arithmetic relationships people search for most often: percentages, ratios, proportions, averages and common number conversions. Each tool exposes the relationship behind the answer instead of returning a number without context.

NumLuma Journey

A useful order, not just a list.

Start with the first question, then move through the connected calculations. You can jump in anywhere, but the sequence keeps the task coherent.

Step 1 of 6

01 Start here Percentage

Find X% of any number.

02 Next calculation Percentage Change

Measure percentage increase or decrease.

03 Next calculation Average

Find the average of several numbers.

04 Next calculation Ratio

Reduce a ratio to simplest form.

05 Next calculation Proportion

Solve for x in a proportion.

06 Next calculation Fraction to Decimal

Convert numerator and denominator to decimal.

Start calculating

Everything you need for this job.

Each tool is free, works without an account and links to its formula, assumptions and related calculators.

Browse all calculators →

ED Everyday

Percentage Calculator

Find X% of any number.

NL / ED Open

ED Everyday

Percentage Change Calculator

Measure percentage increase or decrease.

NL / ED Open

MT Math

Average Calculator

Find the average of several numbers.

NL / MT Open

MT Math

Ratio Calculator

Reduce a ratio to simplest form.

NL / MT Open

MT Math

Proportion Calculator

Solve for x in a proportion.

NL / MT Open

MT Math

Fraction to Decimal Calculator

Convert numerator and denominator to decimal.

NL / MT Open

MT Math

Decimal to Percent Calculator

Turn a decimal into percent.

NL / MT Open

MT Math

Percent to Decimal Calculator

Turn a percent into a decimal.

NL / MT Open

MT Math

Greatest Common Divisor Calculator

Find the GCD of two integers.

NL / MT Open

MT Math

Least Common Multiple Calculator

Find the LCM of two integers.

NL / MT Open

MT Math

Square Root Calculator

Calculate a square root.

NL / MT Open

MT Math

Exponent Calculator

Calculate powers and exponents.

NL / MT Open

Before you calculate

Useful context, not filler.

NumLuma groups tools around real tasks so you can move from one calculation to the next without starting your research over.

When should I use a ratio instead of a percentage?

A ratio compares quantities directly, while a percentage expresses a part relative to a base of 100. The most useful form depends on what you need to compare.

Why should I keep extra decimal places during a calculation?

Rounding intermediate values can compound small errors. Keep more precision during the calculation and round the final result to the level you need.