Calculate percentages, discounts, VAT, salary, mortgage payments, loans, interest, tips, bills, age, dates, time and more.
🔒 Your calculations stay in your browser. No sign-up, no data collection, completely free.
Nothing you type ever leaves your device.
Results update as you type — no "Calculate" button.
No registration, no limits.
Desktop, tablet and mobile.
Find a percentage of a number, work out what percent one number is of another, or calculate a percentage increase or decrease.
Find out how much you'll save and what you'll actually pay after a discount.
Add or remove UK VAT correctly — removing VAT is not the same as subtracting a percentage.
Convert between annual, monthly, weekly and hourly gross pay.
Estimate income tax, National Insurance and net pay for a UK salary. Estimates only — see disclaimer below.
Estimate your monthly mortgage payment, total interest and loan-to-value.
Estimate your monthly repayment, or work out how much you could borrow.
Calculate simple interest or compound interest, with optional regular contributions.
Work out the tip, total and per-person share for a restaurant bill.
Split a bill evenly, or divide different amounts fairly with tip included.
Calculate exact age in years, months and days — correctly handling leap years.
Find the time between two dates, add or subtract time from a date, or count working days.
Find the time between two clock times, or add/subtract time — including crossing midnight.
Convert length, weight, temperature, area, volume, speed, data, time, energy and fuel economy.
Every calculator on this page runs entirely as JavaScript in your browser. Nothing you type — salary, bill amounts, dates, mortgage figures — is uploaded, stored, or sent to Salman IT Tools or anyone else.
Yes — every calculator on this page is completely free, with no sign-up, no account and no usage limits.
Yes. All calculations run directly in your browser using JavaScript. Nothing is uploaded or stored on any server.
Yes — every calculator is designed mobile-first, with full-width inputs, touch-friendly controls and a numeric keyboard where relevant.
Yes. Each calculator has its own URL (for example life-calculator.html#discount) that opens directly to that tool.