LiczarniaOnline calculators and tables
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Calculators, tables and worked examples in one place — everything is worked out as you type, with no calculate button to press.

Liczarnia is a set of calculators for the sums you need to do on the move: percentages and discounts, VAT and margin, loan payments, unit conversions, dates, and school mathematics too — fractions, geometry, equations and statistics. Every calculator shows the formula, the headline result and the values derived from it, so you can see straight away where the number came from.

Quick calculations

3

Percentage of a number

x = a · p / 100
%
18% of 25045
  • Number + p %295
  • Number − p %205

Net → gross (VAT)

gross = net · (1 + s / 100)
%
Gross1,230.00
  • VAT amount230.00
  • Net1,000.00

Percentage change between two values

Δ = (b − a) / a · 100 %
Increase+25.00%
  • Difference62.5
  • Ratio b / a1.25

Sections of the site

11
PercentagesPercentage of a number, percentage change, increases and discounts, percentage points. 9 calculators · 2 tables VAT and tradeNet, gross, margin, markup, discounts and unit price. 7 calculators · 2 tables FinanceCompound interest, interest, loan payments, inflation and rate of return. 6 calculators · 2 tables Fractions and ratiosConverting fractions to percentages, fraction arithmetic, the rule of three and scale. 7 calculators · 1 tables UnitsLength, mass, volume, area, speed, temperature, data and energy. 9 calculators · 2 tables Dates and timeDate difference, business days, age, time conversion and week number. 6 calculators · 1 tables NumbersGCD and LCM, prime factors, powers, number bases, Roman numerals and combinatorics. 8 calculators · 3 tables GeometryAreas and perimeters of shapes, volumes of solids, the Pythagorean theorem and trigonometry. 10 calculators · 3 tables Equations and sequencesLinear and quadratic equations, systems of two equations, arithmetic and geometric sequences. 5 calculators · 2 tables StatisticsMean, median, quartiles, standard deviation, weighted mean and points converted into grades. 4 calculators · 1 tables Tables and cheat sheetsTimes table, squares and roots, SI prefixes and a set of formulas. 4 tables

The site in numbers

74calculators that update as you type
23tables and cheat sheets
19worked examples with full solutions
11topic sections

See also

Tables and cheat sheetsTimes table, squares and roots, SI prefixes and a set of formulas.