Maths Calculators 2026 - Percentage, Fraction, Ratio
What makes the maths category useful
This category groups calculators that solve closely related real-world tasks, so you can move from a quick estimate to a more specific planning tool without restarting the process.
Solve percentage increase, decrease, and reverse percentage problems in one click
Add, subtract, multiply, and divide fractions with mixed numbers and auto-simplification
Compare ratios and proportions side by side with worked-out cross multiplication
Apply sig fig rules for addition, subtraction, multiplication, and division accurately
See the formula and a step-by-step solution beside every numeric answer
School and homework
Check answers and follow each step so you can rework similar problems on tests and assignments.
Quick everyday math
Calculate tips, splits, ratios, and percent changes without setting up the working by hand.
Sig figs and lab work
Apply significant figure rules to lab measurements and engineering work without rounding errors.
All Maths Calculators
3D Graphing Calculator
Visualize mathematical functions in 3D.
Rounding Calculator
Round numbers to any precision or significant figure.
Percentage Calculator
Calculate percentages, increases, decreases instantly.
Percentage Increase Calculator
Find the percentage increase between two values.
Percentage Decrease Calculator
Find the percentage decrease between two values.
Reverse Percentage Calculator
Find the original number before a percentage change.
Percentage Difference Calculator
Find the percentage difference between two values.
Ratio Calculator
Simplify ratios and find equivalent ratios.
Proportion Calculator
Solve for the missing value in a proportion.
Fraction Calculator
Perform arithmetic operations on fractions.
Basic Online Calculator
Simple, large free calculator for everyday maths.
Scientific Calculator
Evaluate advanced mathematical expressions.
Decimal to Fraction Calculator
Convert decimals to simplified fractions.
LCM Calculator
Find the least common multiple of numbers.
GCD Calculator
Find the greatest common divisor of numbers.
Exponent Calculator
Calculate powers and exponents instantly.
Mixed Number to Decimal Converter
Convert mixed numbers like 2 3/8 to decimal.
Irrational Number Checker
Check if a number is rational or irrational.
Common Factors Calculator
Find common factors of two numbers.
Simplified Radical Form Calculator
Simplify square roots into radical form.
Sig Fig Rounding Calculator
Round any number to N significant figures.
Sig Fig Rules Calculator
How many sig figs? Count significant figures instantly.
Sig Fig Multiplication Calculator
Multiply numbers with correct sig fig rounding.
Sig Fig Division Calculator
Divide numbers with correct sig fig rounding.
Sig Fig Addition Calculator
Add numbers with correct sig fig rounding.
Sig Fig Subtraction Calculator
Subtract sig figs with correct precision rounding.
Sig Fig Scientific Notation Calculator
Convert numbers to scientific notation with sig figs.
Log Sig Fig Calculator
Logarithm and pH calculator with correct sig figs.
Sig Fig for Logs Calculator
Calculate antilogs with correct sig figs.
Chemistry Sig Fig Calculator
Calculate moles with correct sig figs for chemistry.
Nth Root Calculator
Any root: square, cube, 4th, nth.
Factorial Calculator
Factorial (n!) for any integer.
Arctan Calculator
Inverse tangent angle from sides.
Arccos Calculator
Inverse cosine angle from ratio.
Sine Calculator
Sine value from angle in degrees.
Tangent Calculator
Tangent value from angle in degrees.
Cosine Calculator
Cos(x) for any angle in degrees with unit circle reference.
Add Angles Calculator
Sum angles in degrees with normalization to 0-360 and radian conversion.
Square Root Calculator
Find the square root of any number, real or complex.
Gigabyte Converter
Convert GB to MB, KB, bytes, and TB in decimal or binary.
Storage Converter
Convert between bytes, KB, MB, GB, and TB in any direction.
TB to GB Calculator
Convert terabytes to gigabytes in decimal or binary.
MB to GB Calculator
Convert megabytes to gigabytes and back.
Bits to Bytes Calculator
Convert bits to bytes and larger storage units.
KB vs MB Calculator
Compare KB and MB to see which is bigger.
Petabyte Converter
Convert petabytes to TB, GB, MB, KB, and bytes.
Golden Ratio Calculator
Divide any length into golden ratio proportions using phi.
Subnet Calculator
Find network address, broadcast, host range, and subnet mask from IP and CIDR.
Distance Between Coordinates Calculator
Haversine great-circle distance in km and miles from lat/long coordinates.
Limit Calculator
Solve standard calculus limits with exact algebraic answers.
Derivative Calculator
Find derivative of a polynomial and evaluate at any x value.
LED Resistor Calculator
Find the right resistor value and power rating for any LED circuit.
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Read articleCategory FAQ
How do I calculate a percentage of a number?
Multiply the number by the percentage as a decimal. 25 percent of 80 is 0.25 times 80, or 20. Use the percentage calculator to handle increase, decrease, and reverse percent in one step.
How do I add fractions with different denominators?
Find a common denominator, convert each fraction, then add the numerators. For 1/3 plus 1/4, the common denominator is 12: 4/12 plus 3/12 equals 7/12.
What is the percentage difference between 80 and 100?
Percentage difference uses the average of the two values. The difference between 80 and 100 is 20, divided by their average of 90, equals about 22.2 percent.
What is the difference between LCM and GCD?
LCM is the smallest number both values divide into evenly, like LCM of 4 and 6 is 12. GCD is the largest number that divides both evenly, like GCD of 12 and 18 is 6.
Do these maths calculators show the steps?
Yes. Most maths tools display the formula, the substituted values, and a worked example. The AI assistant can also walk through the solution if you need a deeper explanation.
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