This collection brings together tools now organized into more specific categories. Browse it or explore the new categories.

Search for a tool

Matematica e studio

Explore tools

Online calculator

Calculate with percentages, decimals and parentheses.

Scientific calculator

Calculate powers, roots, logarithms and trigonometric functions.

Weighted average and ECTS

Calculate an Italian university grade average weighted by ECTS credits.

Italian graduation grade simulator

Estimate an Italian graduation grade from average, thesis points and bonuses.

Fraction calculator

Add, subtract, multiply and divide fractions with an exact simplified result.

Proportions and rule of three

Solve direct and inverse proportions using the rule of three.

Circle area

Calculate the area of a circle from its radius using A = πr². Enter a measurement, see the result in square units and check a worked example.

Circle circumference

Find a circle’s circumference from its radius. The calculator applies C = 2πr and shows the result with a formula and example, without an account.

Triangle area

Calculate triangle area from the base and perpendicular height using A = b × h ÷ 2. Use matching measurement units and get the area in square units.

Trapezoid area

Calculate trapezoid area from two parallel bases and perpendicular height. Apply A = (B + b) × h ÷ 2 and compare the result with a worked example.

Rectangle area

Find rectangle area by multiplying length and width. Enter both measurements in the same unit, see the result and check the formula and example.

Rhombus area

Calculate rhombus area from its two diagonals using A = D × d ÷ 2. Enter their lengths in matching units and check the result, formula and example.

Parallelogram area

Calculate parallelogram area from its base and perpendicular height. The height is not the sloping side; check the formula and example before entering values.

Sphere volume

Calculate sphere volume from its radius using V = 4πr³ ÷ 3. Get a result in cubic units and see how volume differs from the sphere’s surface area.

Cylinder volume

Calculate cylinder volume from the base radius and height using V = πr²h. Use matching measurement units and check the formula and worked example.

Cone volume

Find cone volume from the base radius and perpendicular height. Apply V = πr²h ÷ 3 and check a worked example with a result in cubic units.

Cube volume

Calculate cube volume by cubing its side length: V = s³. Enter the edge measurement and see the result, formula and example in cubic units.

Cuboid volume

Calculate the volume of a rectangular prism or cuboid from length, width and height. Use matching units for the three edges and check a worked example.

Pyramid volume

Calculate pyramid volume from the base area and perpendicular height. Apply V = A × h ÷ 3 and check an example with square and cubic units.

Square root

Calculate the square root of a non-negative number, including decimals. Enter the radicand and get the result with a formula and example.

Prime factorization

Find the prime factorization of an integer from 2 to 1 trillion. See the product of prime factors with their exponents and copy the result.

Equation solver

Solve linear and quadratic equations by entering coefficients a, b and c. Find real or complex roots and identify equations with no or infinitely many solutions.

Least common multiple

Calculate the least common multiple of two or more non-negative integers. Separate numbers with spaces or semicolons and get an exact integer result.

Greatest common divisor

Find the greatest common factor or divisor of two or more non-negative integers. Enter your number list and calculate an exact result, without an account.

Combination calculator

Calculate combinations without repetition using n choose k. Select k items from n when order does not matter, with exact results for up to 1,000 items.

Median calculator

Find the median of a number list, including decimals and negative values. See the observation count, minimum and maximum.

Mode calculator

Find the statistical mode, its frequency and every tied mode in a number list. Free, without an account.

Standard deviation calculator

Calculate population or sample standard deviation, with the mean, variance and denominator used in the calculation.

Variance calculator

Calculate population variance or corrected sample variance. Compare the mean and standard deviation alongside the result.

Event probability calculator

Calculate A or B, A and B, neither event and A given B. Choose independent, mutually exclusive or known-intersection events.

Permutation calculator

Calculate permutations of distinct or repeated elements. Exact integer answers for up to 1,000 elements, without rounding.

Triangle perimeter calculator

Calculate a triangle’s perimeter from three sides and check whether the lengths can form a valid triangle.

Regular hexagon area calculator

Calculate the area of a regular hexagon from its side length, with a formula, example and result in square units.

Sphere surface area calculator

Calculate a sphere’s surface area from its radius using 4πr². Includes a worked example and square-unit results.

Regular polygon area calculator

Calculate the area, perimeter and apothem of a regular polygon using its number of sides and side length.

Percentage calculator with formulas and steps

Calculate a percentage of a number, find the percentage between two values, or work out an increase or decrease with clear formulas and steps.

Discount calculator

Calculate sale price, savings and stacked discounts. Find the discount percentage from two prices or work back to the original price.

Long division calculator with steps and remainders

Solve long division with remainders and decimal places. Follow every subtraction, check the quotient and copy the working, including decimal inputs.

Scientific notation converter

Convert decimal numbers and exponential notation in either direction while preserving the digits you enter.

Percent error calculator

Compare a measured value with a reference. Calculate signed difference, absolute error, relative error and percentage error.

Finanza, lavoro e diritto

Explore tools

VAT calculator

Add VAT to a net amount using a rate of your choice.

Remove VAT

Extract VAT from a gross total to find the net amount and tax.

Compound interest calculator

Simulate compound interest with monthly contributions and an annual breakdown.

Tip calculator and bill splitter

Split a bill between people, add an optional tip and check the amount each person owes. See the total, tip and rounding adjustments.

Mortgage payment

Estimate a fixed nominal-rate mortgage payment with a monthly schedule. Rounded to cents with an adjusted final payment; fees and variable rates excluded.

Loan payment

Calculate a fixed nominal-rate loan payment and interest cost. 1–600 monthly payments; extra fees excluded. Final payment adjusted to the remaining balance.

Amortization schedule

Generate a fixed-payment monthly amortization schedule: principal, interest and remaining debt. Export CSV. Fixed nominal rate, exact cents, adjusted final payment.

APR calculator

Estimate APR from principal, equal monthly payments and entered fees. Solves cash-flow present value with equal months. Does not replace contractual APR.

Savings plan simulator

Simulate a savings plan with initial capital, monthly deposits and constant effective annual return. Annual table and CSV; excludes tax, costs and inflation.

ROI calculator

Calculate ROI as net profit divided by investment cost. Revenue or final value and costs must cover the same period; the return is not annualized.

ROAS calculator

Calculate attributed revenue divided by advertising spend. A 3× ROAS equals 300% of ad costs and does not measure net profit.

Margin and markup

Distinguish margin on price from markup on cost. Cost 60 and price 100 gives 40% margin and 66.67% markup. Use values excluding VAT for a consistent comparison.

Business break-even

Find units needed to cover fixed and variable costs. Rounds units up; unit price must exceed variable cost. Single-product model.

Selling price

Find selling price from cost and target margin or markup. Margin must be below 100%. Currency result rounded up to cents, without automatic VAT.

Italian salary: gross and net 2026

Estimate Italian net salary from gross pay or find gross pay from net income for 2026. Adjust contributions, local taxes and payments, with an annual breakdown.

Italian pension: gross and net 2026

Estimate Italian net pension from gross income for 2026, or reverse the calculation. View annual tax, pension deductions and the monthly average over 13 payments.

Simple interest calculator with your own rate

Calculate simple interest and the final balance from your principal, rate and time period. Review the formula and steps using the rate you provide.

Hourly wage calculator: gross pay and hours

Calculate gross pay from hours and your hourly rate, or work out an hourly wage from gross earnings. Set the hours and period; taxes are not calculated.

Inflation calculator and purchasing power

Compare money across years using official World Bank/IMF CPI data. Choose a country and available years to calculate cumulative inflation and purchasing power.

Mileage reimbursement calculator

Calculate mileage reimbursement with your own rate, IRS rates by travel date or French passenger car tables. Check distance units, sources and validity periods.

Unità e calcoli tecnici

Explore tools

EV charging cost calculator

Estimate charging costs using battery capacity, the charge percentage needed and your price per kWh. Adjust the tariff and charging losses.

EV charging time calculator

Estimate charging time from battery capacity, starting and target charge levels and effective power. Compare scenarios with clear assumptions.

Watts, amps and volts calculator

Calculate amps, watts or volts from the values you know. Choose DC or AC and include power factor when the selected circuit requires it.

Dimensional and volumetric weight calculator

Enter package dimensions and actual weight. Use your carrier’s divisor to calculate dimensional weight and compare the weight used for billing.

Fuel consumption

Calculate L/100 km, km/L and fuel cost from distance, fuel used and price. Distance and fuel must refer to the same trip; cost in euros.

Benessere e sport

Explore tools

BMI calculator

Calculate adult BMI from weight and height. A general index, not a diagnosis: it does not distinguish muscle and fat or apply in the same way during pregnancy or childhood.

Basal metabolic rate

Estimate resting energy with Mifflin–St Jeor (ages 19–78). Not a clinical measurement of basal metabolism. Not for pregnancy, breastfeeding or medical conditions.

Calorie needs

Indicative energy estimate: Mifflin–St Jeor × chosen PAL (1.4–2.4), for healthy adults 19–78. Not a diet prescription; excludes pregnancy, breastfeeding and medical conditions.

Running pace

Calculate average pace per km and mile and speed from distance and time. Projections assume constant pace and do not predict performance or endurance.

Date e tempo

Explore tools

Add days to a date

Add or subtract days from a date and find the resulting date and weekday. Includes weekends, holidays and leap years, with no registration.

Age calculator

Calculate age from a date of birth in years, months and days. Choose a reference date and see the number of days until the next birthday.