Online Calculators & Simulators
Over 25 free tools for finance, home, work, education and health. No registration required.
Finance
Mortgage, income tax, investments, salary and personal budget.
Mortgage Calculator
Calculate your mortgage payment and see a full amortisation schedule.
Personal Loan Calculator
Calculate monthly payments and total cost of your personal loan.
Percentage Calculator
Calculate any percentage: what % of a number, % increase/decrease and more.
VAT Calculator
Add or remove VAT from any amount instantly.
Spanish Income Tax Calculator (IRPF)
Calculate Spanish income tax (IRPF) and your net take-home pay.
Compound Interest Calculator
See how compound interest grows your savings over time.
Net Salary Calculator (Spain)
Calculate your net take-home pay after taxes and Social Security in Spain.
Rent vs Buy Calculator
Compare renting vs buying a home over the long term.
Early Mortgage Repayment Calculator
Calculate interest saved by repaying your mortgage early.
APR / Nominal Rate Converter
Convert between APR and nominal rate for any compounding frequency.
Home
Car costs, electricity consumption and household expenses.
Work
Time tracking, overtime and work records.
Severance Pay Calculator (Spain)
Calculate your Spanish severance pay (finiquito).
Spanish DNI Letter Calculator
Calculate the check letter for a Spanish DNI or NIE number.
Spanish Freelancer Tax Calculator
Calculate your Spanish freelancer Social Security contribution (RETA) 2026.
Days Between Dates Calculator
Calculate days, weeks, months and working days between two dates.
Work Hours Calculator
Track work hours, calculate overtime and monitor your schedule.
Spanish Unemployment Benefit Calculator
Calculate your Spanish unemployment benefit amount and duration.
Spanish Retirement Pension Calculator
Estimate your Spanish state retirement pension.
Education
Physics, kinematics and unit converters.
Pythagorean Theorem Calculator
Calculate the hypotenuse or any side of a right triangle.
Rule of Three Calculator
Solve direct and inverse rule of three problems instantly.
Grade Average Calculator
Calculate your simple or weighted grade average.
Uniform Motion Calculator (ULM)
Solve distance, velocity and time problems for uniform motion.
Uniformly Accelerated Motion Calculator
Calculate position, velocity and acceleration in accelerated motion.
Unit Converter
Convert between metric and imperial: length, mass, temperature, volume.