Free online calculators and converters
A simple collection of free tools for everyday calculations. Built for quick answers, mobile use and clear results.
Simple tools for everyday calculations
Free Online Calculator is a growing set of practical tools designed to help with common questions around money, property, health, cooking and everyday measurements. Whether you are estimating mortgage repayments, checking your salary after tax, planning a student budget, converting units, or translating TikTok recipes into grams and millilitres, the calculators are designed to be fast and easy to use.
The tools run directly in your browser. There are no sign ups, no downloads and no complicated steps. You enter your figures, and the calculator shows clear results instantly. Many tools are designed with UK users in mind, but several can also be used internationally.
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Most popular calculators
Mortgage calculator
Estimate monthly mortgage repayments, total interest and affordability.
Open mortgage calculatorSalary after tax calculator
Estimate UK take home pay after tax and National Insurance.
Open salary calculatorStudent budget calculator
Plan your weekly budget using loan, rent, bills and income.
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All calculators and converters
Browse the full list of tools below. Each page includes a quick calculator plus helpful FAQs and guidance for common scenarios.
BMI calculator
Check Body Mass Index using kg or stone, and cm or feet and inches.
Use BMI calculatorMeasurement converter
Switch between cm, metres, feet, inches and common area units.
Convert measurementsUnit converters
Quick conversions for temperature, speed, volume and time.
Try unit convertersCooking measurement converter
Convert cups to grams, ounces, ml, tablespoons and teaspoons for TikTok and US recipes.
Open cooking converterStamp Duty calculator
Estimate Stamp Duty Land Tax (SDLT) on a property purchase.
Check Stamp DutyCouncil Tax band calculator
Estimate your Council Tax band and example yearly charge.
Check Council TaxLoan repayment calculator
Estimate repayments and total interest on a personal loan.
Check loan costsHow these calculators work
Calculations are performed in your browser and are intended as helpful estimates. The information you enter is not stored by the tools. Results should be used as guides and not as financial, medical or legal advice.
Who these tools are useful for
These tools are designed for quick everyday checks. They are useful for home buyers comparing mortgage costs, employees checking take home pay, students planning budgets, people tracking health related figures, and cooks converting online recipes into UK measurements.
Frequently asked questions
Is this site free to use?
Yes. All calculators and converters on this site are free and do not require registration.
Are the results accurate?
The tools use standard calculation methods and common conversion factors. Results are estimates intended for guidance.
Do I need to download anything?
No. Everything runs directly in your browser on desktop, tablet and mobile devices.
Is this site designed for UK users?
Yes. Many tools are designed around UK conventions, but several can also be used internationally.
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Free Online Calculator provides easy-to-use UK-focused calculators for mortgages, tax, budgeting, health, cooking and everyday conversions. All tools are free and designed to give quick, clear estimates.