Calculator
A modern calculator app for basic arithmetic, parentheses, percentages, memory, history and keyboard control.
Mathematics
Rechnerpilot's math calculators solve everyday and school problems and show every step of the working. From a quick percentage to the statistical summary of a whole data set, each result is explained so you can follow exactly how it was reached.
Arithmetic & Algebra
Calculators and tools in the Arithmetic & Algebra section.
Open
Discount Calculator
Calculate final price, original price or discount percentage for free — for sales, coupons and price reductions with savings and step-by-step solution.
Fraction Calculator
Add, subtract, multiply and divide fractions, reduce and expand them – calculated exactly, with a reduced result, mixed number and calculation steps.
Percentage Calculator
Calculate shares, discounts, surcharges and changes with clear inputs and understandable results.
Percentage Change
Calculate the percentage change between two values — determine increase, decrease, new or old value instantly for free.
Rule of Three Calculator
Calculate rule-of-three problems with value A, value B and the sought value for direct or inverse proportional relationships.
Surcharge Calculator
Calculate new value, base value, surcharge amount and surcharge percentage from price or value increases.
Statistics & Data Analysis
Calculators and tools in the Statistics & Data Analysis section.
Grade Average Calculator
Quickly calculate a grade average: a simple mean of all grades or a weighted average with individual weights – including the best and worst grade and calculation steps.
Statistics Calculator
Analyse number lists with mean, median, variance, standard deviation, quartiles, percentiles, outliers, data quality and charts.
Units & Conversion
Calculators and tools in the Units & Conversion section.
Unit Converter
Convert length, weight, temperature and volume with value, source unit, target unit and step-by-step solution.
Everyday Mathematics
Calculators and tools in the Everyday Mathematics section.
Margin Calculator
Calculate trade margin, markup and gross profit from purchase and selling price, or determine the selling price from a target margin or markup – net, with calculation steps.
Price Comparison Calculator
Compare offers fairly: calculate the unit price per unit (kg, liter, piece), find the cheapest offer and see how much more the others cost in percent.
Recipe Converter
Convert recipe amounts to a different number of servings or a free factor – all ingredients are scaled proportionally, with calculation steps.
Tip Calculator
Calculate a tip as a percentage or round the bill up to an even amount – including total, amount per person and effective percentage.