All Calculators
Browse all 29 free online calculators, organized by category.
Percentage & Math Calculators
Use Calculator →Calculate percentages quickly and accurately: percentage of a number, increase, decrease, change, difference and more — each with the formula and worked examples.
Percentage Calculator
All-in-one percentage calculator: X% of a number, what percent X is of Y, and percentage change.
Use CalculatorPercentage Increase Calculator
Find the percentage increase from an original value to a new value, with the amount gained.
Use CalculatorPercentage Decrease Calculator
Find the percentage decrease from an original value to a new, smaller value.
Use CalculatorPercentage Change Calculator
Signed percentage change between two values — increase or decrease, clearly labeled.
Use CalculatorPercentage Difference Calculator
Symmetric relative difference between two values — neither value is the reference.
Use CalculatorPercentage Off Calculator
“X% off” made simple: see the discount amount and the final price instantly.
Use CalculatorPercentage of a Number Calculator
Dedicated calculator for “what is X% of Y” — fast, focused, one answer.
Use CalculatorFind Percentage Calculator
Find what percentage one number (the part) is of another (the whole).
Use CalculatorPercent Calculator
Convert between decimals and percentages in both directions instantly.
Use CalculatorReverse Percentage Calculator
X is P% of what number? Find the original whole from a part and its percentage.
Use CalculatorPercentage Error Calculator
Compare an estimated or measured value against the true value.
Use CalculatorPrice Increase Percentage Calculator
See how much a price went up — as a percentage and in money terms.
Use CalculatorPrice Decrease Percentage Calculator
See how much a price dropped — as a percentage and in money saved.
Use CalculatorFinance & Money Calculators
Use Calculator →Money calculators for everyday decisions: discounts, sales tax, VAT, markup, profit margin, ROI and salary increases, with currency selection and localized formats.
Discount Calculator
Calculate the discount amount and final price — or work backwards from a sale price.
Use CalculatorSales Tax Calculator
Add sales tax to a net price, or extract the pre-tax amount from a total.
Use CalculatorVAT Calculator
Add or remove VAT (GST) at any rate — net, VAT amount and gross in one view.
Use CalculatorMarkup Calculator
Calculate selling price from cost plus a percentage markup.
Use CalculatorProfit Margin Calculator
Calculate profit margin from revenue and cost, or find the price needed for a target margin.
Use CalculatorROI Calculator
Return on investment expressed as a percentage — the universal business metric.
Use CalculatorSalary Increase Calculator
Convert a raise percentage into an actual salary amount.
Use CalculatorEducation Calculators
Use Calculator →Student calculators for marks percentage, CGPA to percentage, GPA, weighted grades and attendance — with clear formulas for every education system.
Marks Percentage Calculator
Convert obtained marks and total marks into a percentage instantly.
Use CalculatorMarks to Percentage Calculator
Aggregate multiple subjects with different totals into one overall percentage.
Use CalculatorCGPA to Percentage Calculator
Convert CGPA to percentage using standard multipliers.
Use CalculatorGPA Calculator
Calculate weighted GPA from letter grades and credit hours.
Use CalculatorGrade Calculator
Calculate your overall grade from weighted assessments.
Use CalculatorAttendance Percentage Calculator
Track class attendance and find how many classes you can skip.
Use CalculatorHealth & Fitness Calculators
Use Calculator →Estimate body fat percentage and weight loss percentage. Results are informational estimates and are not medical advice.
Food & Hospitality Calculators
Use Calculator →Dining calculators for real life: tip calculator with bill splitting in your local currency.