Calculators
Everyday calculations, ready to use. Each one is an Axioma formula you can run with your own numbers, look inside and adapt to your case.
Loans and savings
Loan payment calculator
Work out the fixed monthly payment on a loan from the amount borrowed, the annual interest and the term in months.
capital * (interes / 100 / 12) / (1 - (1 + interes / 100 / 12) ^ -meses)Compound interest calculator
See what a sum grows to when it earns an annual return over several years and the gains are reinvested.
capital * (1 + tasa / 100) ^ aniosSimple interest calculator
Work out what is repaid on a loan whose interest is always charged on the original principal.
capital + capital * tasa * anios / 100Monthly savings calculator with returns
See what your monthly saving grows to once it also earns a return.
aporte * ((1 + tasa / 100 / 12) ^ meses - 1) / (tasa / 100 / 12)Convert an effective annual rate to a monthly rate
Turn an effective annual interest rate into the equivalent monthly rate, the one actually charged or earned each month.
((1 + tasa_anual / 100) ^ (1 / 12) - 1) * 100
Work and payroll
Colombian statutory bonus calculator (prima de servicios)
Work out the Colombian prima de servicios from salary, transport allowance and days worked.
(salario + auxilio) * dias / 360Colombia net salary calculator 2026: contributions and withholding
Work out net pay in Colombia under an employment contract, an all-inclusive salary or a services contract: health, pension, transport allowance and withholding.
salario + auxilio - salud - pension - solidaridad - arl - retencionColombian employment settlement calculator 2026, all included
Work out a final settlement in Colombia: severance pay and its interest, service bonus, vacation and dismissal compensation by contract type and how it ended.
cesantias + intereses_cesantias + prima + vacaciones + salario_pendiente + indemnizacion
Prices and spending
VAT calculator: add tax to a price
Add VAT to a price and see what the total comes to.
base * (1 + iva / 100)Discount calculator
Find out what something costs once a percentage discount has been taken off.
precio * (1 - descuento / 100)Split the bill calculator, tip included
Share a restaurant bill between several people with the tip already added in.
cuenta * (1 + propina / 100) / personasSelling price calculator from your margin
Work out what to charge for a product so that you keep the margin you want on the sale.
costo / (1 - margen / 100)Trip fuel cost calculator
Work out what a trip costs in fuel, from the distance and how far your car goes on a gallon.
distancia / rendimiento * precio_galonRemove VAT from a price: price before tax calculator
Work out the price before VAT from a total that already includes it, and how much of what you pay is tax.
precio_con_iva / (1 + iva / 100)
Percentages and ratios
Rule of three calculator: work out a proportion
If one amount equals another, find what a third amount comes to at the same rate.
equivale_a * cantidad / referenciaPercentage calculator: what is a % of a number
Work out what a percentage of an amount comes to, such as 15 % of 250,000.
valor * porcentaje / 100Percentage change calculator: how much it rose or fell
Work out the percentage a figure rose or fell between two points, such as a price or a salary.
(valor_final - valor_inicial) * 100 / valor_inicialPercentage calculator: what percent is one number of another
Work out what percentage one amount is of another, such as how much 37,500 is of 250,000: 15 %.
parte / total * 100
Health, school and units
BMI calculator (body mass index)
Work out your body mass index from your weight in kilograms and your height in metres.
peso / altura ^ 2What grade do I need on the final exam
Work out the grade you need on the remaining exam to reach the final grade you are after.
(nota_objetivo * 100 - nota_actual * (100 - peso_examen)) / peso_examenCelsius to Fahrenheit converter
Convert a temperature from degrees Celsius to Fahrenheit, such as 25 °C which is 77 °F.
celsius * 9 / 5 + 32Fuel economy converter: mpg, km/L, L/100 km and km per gallon
Convert fuel economy between miles per gallon (US or UK), kilometres per litre, kilometres per gallon and litres per 100 km, with exact factors.
unidad_destino == "l_100km" ? 100 / (unidad_origen == "l_100km" ? 100 / consumo : consumo * buscar(km_por_litro, unidad_origen)) : (unidad_origen == "l_100km" ? 100 / consumo : consumo * buscar(km_por_litro, unidad_origen)) / buscar(km_por_litro, unidad_destino)Convert pounds to kilograms: lb to kg calculator
Convert a weight in pounds to kilograms with the exact factor, such as 150 pounds, which is 68.04 kilograms.
libras * 0.45359237