Calculator
A modern calculator app for basic arithmetic, parentheses, percentages, memory, history and keyboard control.
Arithmetic & Algebra
Calculators and tools in the Arithmetic & Algebra section.
Basic Arithmetic
Calculators in the Basic Arithmetic topic.
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Fraction Calculator
Add, subtract, multiply and divide fractions, reduce and expand them – calculated exactly, with a reduced result, mixed number and calculation steps.
Percentages
Calculators in the Percentages topic.
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.
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.
Surcharge Calculator
Calculate new value, base value, surcharge amount and surcharge percentage from price or value increases.
Proportions
Calculators in the Proportions topic.
Rule of Three Calculator
Calculate rule-of-three problems with value A, value B and the sought value for direct or inverse proportional relationships.