Calcolatrici online
Calcolatori online gratuiti per età, percentuale, media, sconto, imposta sulle vendite, interesse semplice e probabilità. Risposte accurate all'istante. Provali subito!
Calcolatrici online gratuite – Età, percentuali e interessi
Calcolatrici online gratuite – Età, percentuali e interessi
- 🧰 7 free tools
- 💸 100% free
- 🔓 Nessuna registrazione
- 📱 Funziona su qualsiasi dispositivo
- 🔒 Secure HTTPS
Online calculators give fast, accurate answers for everyday maths – from exact age and percentages to discounts, tax and interest.
All 7 Free Online Calculators
Calcolatore dell’etàCalculate your exact age in years, months and days from your date of birth
Calcolatore di percentualiCalculate percentages instantly – X% of Y, percentage change and what percent one number is of another
Calcolatore della mediaFind the average (mean) of a list of numbers instantly
Calcolatore dell’imposta sulle venditeCalculate sales tax, GST or VAT and the total price instantly
Calcolatore di scontiCalculate the discount amount and final sale price instantly
Calcolatore di probabilitàCalculate the probability of single and multiple events online
Generatore di numeri casualiGenerate random numbers within any range instantly
| Tool | What it does | Input / Best for |
|---|---|---|
| Calcolatore dell’età | Calculate your exact age in years, months and days from your date of birth | numbers → answer |
| Calcolatore di percentuali | Calculate percentages instantly – X% of Y, percentage change and what percent one number is of another | numbers → answer |
| Calcolatore della media | Find the average (mean) of a list of numbers instantly | numbers → answer |
| Calcolatore dell’imposta sulle vendite | Calculate sales tax, GST or VAT and the total price instantly | numbers → answer |
| Calcolatore di sconti | Calculate the discount amount and final sale price instantly | numbers → answer |
| Calcolatore di probabilità | Calculate the probability of single and multiple events online | numbers → answer |
| Generatore di numeri casuali | Generate random numbers within any range instantly | numbers → answer |
Calcolatore dell’età
An age calculator subtracts your birth date from today (or any date) and shows the exact difference. It is used for forms, exams, job eligibility and birthdays.
Open Age Calculator →Calcolatore di percentuali
A percentage expresses a part of 100. The calculator handles common questions such as marks percentage, discounts, profit and growth.
Open Percentage Calculator →Calcolatore della media
The average is the sum of all values divided by how many values there are. It is used for marks, sales, expenses and statistics.
Open Average Calculator →Calcolatore dell’imposta sulle vendite
A sales tax calculator applies a tax rate to a price. It helps shoppers, shop owners and freelancers know the exact amount to pay or charge.
Open Sales Tax Calculator →How to Use Our Online Calculators
- Enter the required numbers or dates in the input fields.
- Select any options such as units or calculation type.
- Click the calculate button.
- Read the answer instantly and repeat with new values if needed.
Online Calculators – Quick Reference
| Calculation | Formula |
|---|---|
| Percentage | Value × Percent ÷ 100 |
| Average | Sum of values ÷ Count |
| Discount price | Price − (Price × Discount ÷ 100) |
| Price with tax | Price + (Price × Tax rate ÷ 100) |
| Simple interest | Principal × Rate × Time ÷ 100 |
Why Use Our Calculators?
- Accurate formulas Uses standard mathematical formulas for reliable answers.
- Instant answers Results appear immediately after you click calculate.
- Free forever The tool is free with no limits on use.
- No app needed Runs in your browser on any phone or computer.
- Easy to read Clear results that are simple to understand and share.
- Great for study and work Useful for students, shoppers, teachers and professionals.
Tips for Using Online Calculators
- Double-check the numbers you type – most errors come from input mistakes.
- Use decimal points rather than commas for fractions.
- For money decisions, round the final value only at the end.
- Bookmark the calculator so it is ready when you need it.
Online Calculators – Worked Example
Example: a jacket costs ₹2,499 with 30% off. The discount is 2,499 × 30 ÷ 100 = ₹749.70, so the final price is ₹1,749.30. If 18% tax is then added, multiply the discounted price by 0.18 and add the result.
Online Calculators Glossary
- Percentage
- A part of 100, written with the % sign.
- Mean (average)
- The sum of all values divided by how many values there are.
- Principal
- The original amount of money borrowed or invested.
- Rate
- The percentage charged or earned per period, usually per year.
- Probability
- How likely an event is, from 0 (impossible) to 1 (certain).
Helpful Guides for Online Calculators
- 📘How to Calculate Exact Age from Date of BirthWork out exact age in years, months and days from a date of birth – by hand or with a free calculator – including leap-year cases.
- 📘How to Calculate Percentage: Formulas and ExamplesPercentage formulas made easy: percent of a number, percentage change, increase and discount, with clear worked examples you can reuse.
- 📘Simple Interest Explained: Formula, Examples and UsesSimple interest explained: the formula, worked examples for loans and savings, and how it compares with compound interest over time.
Domande frequenti
Are these calculators free?
Yes. Every tool in this category is free to use on pdfseotools.com with no sign-up.
Do the tools work on mobile?
Yes. They work in any modern browser on Android, iPhone, Windows and Mac.
Is my data safe?
Yes. Connections use HTTPS and uploaded files are removed after processing.
Devo installare software o creare un account?
No. Tutto viene eseguito nel tuo browser web su Windows, Mac, Android e iPhone – non c'è nulla da scaricare, nulla da installare e nessun account da creare.
Is there a limit on how often I can use these tools?
You can use the tools as often as you need for normal everyday tasks. Very large files or extreme usage may be limited to keep the service fast for everyone.
Where can I find more free tools?
Open the menu or the categories on pdfseotools.com to browse 150+ free tools for PDFs, images, text, SEO and development.