Simple calculators made for Sri Lanka
Free online tools for everyday life in Sri Lanka
From salaries and electricity bills to university grades and important health dates, get a clear answer in seconds.
No sign-up or payment. Entries stay in your browser.
Quick starts
Popular starting points
Pick the question closest to yours and go straight to the answer.
There is more to explore
Tools for the different parts of life
Whether you are planning a budget, chasing a grade, running a small business, or checking a bill, start with the section that feels familiar.
Money matters
Make payday and repayments easier
Understand what comes in, what goes out, and what a financial decision may cost each month.
Explore all money tools- Income Tax (APIT) CalculatorEstimate monthly APIT, employee EPF, and take-home salary.
- Loan / EMI CalculatorWork out monthly instalments and total interest on a loan in LKR.
- Vehicle Lease EMI CalculatorCalculate your monthly vehicle lease installments, total interest, and loan-to-value ratio for Sri Lankan banks and finance companies.
Student life
Stay on top of grades and attendance
Turn marks, credits, and lecture counts into a simple next step you can act on.
Explore all student tools- Final Exam TargetCalculate exactly what you need to score on your final exam to achieve an A, B, or pass the module based on your assignment and mid-term marks.
- Attendance TrackerCalculate how many university lectures you can safely skip or need to attend to maintain the strict 80% UGC attendance requirement.
- Target GPA EstimatorEstimate the GPA average needed across your remaining university credits.
Health and wellbeing
Check useful dates and everyday health numbers
Get a helpful estimate for planning while keeping important health limitations in view.
Explore all health toolsWork and business
Price work and plan costs with confidence
Useful starting points for invoices, payroll, freelance work, and day-to-day business decisions.
Explore all business toolsEveryday answers
Sort out the small calculations quickly
Bills, dates, percentages, fuel, and the quick sums that should not need a spreadsheet.
Explore all everyday toolsWhy use HariTools?
Helpful answers without hidden details
Made for Sri Lanka
Local tax rules, tariffs, university needs, and LKR are built into the tools that need them.
Free and private
Use every calculator without payment or an account. Your calculator entries stay in your browser.
Clear calculation methods
Where rules matter, we show sources, review dates, assumptions, and practical limitations.
Recently reviewed
Tools checked against current sources
These regulated calculators include their source, effective date, method, and latest review date.
Worth knowing
A little help for the bigger decisions
Plain-language guides for the rules and choices behind the numbers.
Before you start
A few things people ask us
Still looking for something? Tell us what would make HariTools more useful through the contact page.