Free Online Calculators & Everyday Tools
Fast, mobile-friendly calculators for math, finance, construction, conversions, dates and everyday tasks. Built for users in the US, UK, Canada and Australia.
Popular Calculators
View AllBasic Calculator
Free online basic calculator for addition, subtraction, multiplication and division. Simple, fast and mobile-friendly for users in the US, UK, Canada and Australia.
Receipt Generator
Create professional receipts with business details, items, discount and tax. Print or save as PDF. Free for small businesses in the US, UK, Canada and Australia.
Percentage Calculator
Free percentage calculator for US, UK, Canada & Australia. Find percentages, percentage increase, decrease and percent of a number instantly. No signup required.
Salary Calculator
Free salary calculator for US, UK, Canada & Australia. Convert annual income into monthly, biweekly, weekly, daily and hourly pay instantly. Try it now.
Mortgage Calculator
Free mortgage calculator for US, UK, Canada & Australia. Estimate monthly payments, total interest and total loan cost. Ideal for first-time home buyers.
EMI Calculator
Free EMI calculator for US, UK, Canada & Australia. Work out monthly installments, total interest and total repayment for a fixed-rate loan. Instant results.
Age Calculator
Free age calculator for US, UK, Canada & Australia. Find your exact age in years, months and days from your date of birth. Simple, fast and mobile-friendly.
Currency Converter
Free currency converter for USD, GBP, CAD and AUD. Convert between US Dollar, British Pound, Canadian Dollar and Australian Dollar with editable rates.
Plot Area Calculator
Calculate plot area in sq ft, sq m, sq yd, marla, kanal, acre and hectare with ground coverage and total built-up area.
Tip Calculator
Free tip calculator for US, UK, Canada & Australia. Work out restaurant tips, total bill and per-person payment. Perfect for dining out with friends and family.
Discount Calculator
Free discount calculator for US, UK, Canada & Australia. Find the sale price, discount amount and final price from an original price and discount percentage.
Land Area Converter
Convert square feet, square meters, square yards, marla, kanal, acre and hectare.
BMI Calculator
Calculate Body Mass Index from height and weight.
All Main Calculators
Basic Calculator
Free online basic calculator for addition, subtraction, multiplication and division. Simple, fast and mobile-friendly for users in the US, UK, Canada and Australia.
Percentage Calculator
Free percentage calculator for US, UK, Canada & Australia. Find percentages, percentage increase, decrease and percent of a number instantly. No signup required.
Salary Calculator
Free salary calculator for US, UK, Canada & Australia. Convert annual income into monthly, biweekly, weekly, daily and hourly pay instantly. Try it now.
Receipt Generator
Create professional receipts with business details, items, discount and tax. Print or save as PDF. Free for small businesses in the US, UK, Canada and Australia.
Overtime Calculator
Free overtime calculator for US, UK, Canada & Australia. Work out regular pay, overtime pay, overtime rate and total earnings from hourly rate and hours.
Tip Calculator
Free tip calculator for US, UK, Canada & Australia. Work out restaurant tips, total bill and per-person payment. Perfect for dining out with friends and family.
Discount Calculator
Free discount calculator for US, UK, Canada & Australia. Find the sale price, discount amount and final price from an original price and discount percentage.
Age Calculator
Free age calculator for US, UK, Canada & Australia. Find your exact age in years, months and days from your date of birth. Simple, fast and mobile-friendly.
Date Calculator
Free date calculator for US, UK, Canada & Australia. Find the difference between two dates and calculate dates by adding or subtracting days, months and years.
Construction Calculator
Free construction calculator for US, UK, Canada & Australia. Estimate building costs from area and cost per square foot. Useful for homeowners and builders.
Currency Converter
Free currency converter for USD, GBP, CAD and AUD. Convert between US Dollar, British Pound, Canadian Dollar and Australian Dollar with editable rates.
Mortgage Calculator
Free mortgage calculator for US, UK, Canada & Australia. Estimate monthly payments, total interest and total loan cost. Ideal for first-time home buyers.
EMI Calculator
Free EMI calculator for US, UK, Canada & Australia. Work out monthly installments, total interest and total repayment for a fixed-rate loan. Instant results.
VAT Calculator
Free VAT calculator for UK and international businesses. Add VAT to a net price or remove VAT from a VAT-inclusive amount using the percentage you enter.
GST Calculator
Free GST calculator for Australia, Canada and international businesses. Add GST to a net price or remove GST from a GST-inclusive amount instantly.
Built for Users in the US, UK, Canada & Australia
ProCalculatorz provides general-purpose calculations for everyday use. Enter the amount, rate, unit or other value that applies to your situation. Currency and tax calculations may depend on local rules or current exchange rates in your country.
Free Online Calculators for USA, UK, Canada & Australia
ProCalculatorz is a free international calculator platform designed for users across the United States, United Kingdom, Canada and Australia. Whether you're a student, professional, small business owner, homeowner, or anyone who needs fast and accurate calculations — our tools are built to help you get answers instantly. All calculators work with universal global units, and our currency converter supports USD, GBP, CAD and AUD seamlessly.
Why Choose ProCalculatorz?
- 100% Free Forever — No subscriptions, no premium tiers, no credit card.
- No Signup Required — Start calculating instantly without creating an account.
- Privacy-First — All calculations run in your browser. Your data never leaves your device.
- Mobile-Friendly — Works perfectly on iPhone, Android, tablets and desktops.
- Fast & Accurate — Instant results using industry-standard formulas.
- International — Supports USD, GBP, CAD, AUD and universal units.
Calculation Categories
- Finance: Mortgage, EMI, salary, compound interest, retirement, inflation
- Business: Receipt generator, markup, profit margin, break-even
- Math: Percentage, average, random number generator
- Property: Plot area, land converter, building area, construction cost
- Date & Time: Age, date difference, hours, days, countdown
- Health: BMI, calorie calculator
- Education: GPA, grade calculator
- Conversion: Currency, unit, length, weight, temperature, speed
Frequently Asked Questions
Are these calculators free to use in the US, UK, Canada and Australia?
Yes. All ProCalculatorz calculators are 100% free for users in the United States, United Kingdom, Canada, Australia and worldwide. No signup, no subscription, no credit card required.
Do you store my inputs or calculation data?
No. All calculations are performed locally in your browser using JavaScript. Your numbers are never sent to our servers, never stored, and never shared with third parties.
Are the currency and tax results official?
No. Currency exchange rates and tax rates are editable inputs. Always verify the applicable official rate in your country (USD, GBP, CAD, AUD) before making financial decisions.
Can I use these calculators on a mobile phone?
Yes. The site is fully mobile-friendly and works perfectly on phones, tablets and desktop browsers.
How many calculators do you offer?
ProCalculatorz currently offers over 40 free online calculators across finance, math, health, education, construction, conversion and date categories.