Tools
Calculators
Online calculators
Calculators and unit converters for everyday life and technical work.
9 tools
Algebra calculatorSimplify, factor, solve equations and take derivatives symbolically.Graphing calculatorPlot mathematical functions and explore their graphs with zoom and pan.Number base converterConvert numbers between decimal, hexadecimal, binary and octal.Percentage calculatorWork out a percentage of an amount, what percentage one number is of another, increases, decreases and discounts.Scientific calculatorA full scientific calculator with trigonometry, logarithms and history.Spanish invoice calculator with VAT and IRPFWork out a freelancer invoice in Spain: net amount, VAT, IRPF withholding and total to receive, or the net amount from what you want to receive.Spanish net salary calculatorConvert a gross salary in Spain to net with 2026 Social Security and IRPF withholding: net per month, in 12 or 14 payments, and per year.Spanish VAT (IVA) calculatorAdd or remove Spanish VAT at 21 %, 10 % or 4 % and see the net amount, the VAT and the total.Unit converterConvert length, weight, temperature, volume, area, speed and data units.
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