Calculator Directory
Browse Sri Lanka calculators by category
Explore calculators for electricity bills, health, salary and tax, loans, fixed deposits, telecom usage, and vehicle costs from one organized hub.
Search across 92 calculators
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6 itemsSalary Tax CalculatorsSalary, APIT, PAYE-style withholding, EPF, ETF, and income-tax tools grouped in one place.Open cluster6 itemsElectricity and Energy CalculatorsElectricity, water, solar, LPG, and fuel-cost tools grouped for household and energy planning.Open cluster8 itemsLoans and Finance CalculatorsLoans, mortgage, leasing, pawning, savings, and deposit tools for Sri Lanka finance decisions.Open cluster7 itemsHome Improvement CalculatorsPaint, tile, concrete, flooring, wallpaper, roof, and AC sizing tools.Open cluster6 itemsPregnancy and Baby CalculatorsDue date, ovulation, feeding, sleep, baby age, and pregnancy planning tools.Open cluster6 itemsEducation CalculatorsStudent tools for GPA, grades, exams, study planning, and academic helpers.Open cluster7 itemsConversion CalculatorsLength, weight, temperature, volume, area, timezone, and file size converters.Open cluster7 itemsHealth CalculatorsHealth, fitness, hydration, calorie, and body-composition tools grouped in one section for everyday planning.Open cluster6 itemsSalary and Work CalculatorsSalary conversion, overtime, freelance pricing, work hours, and shift tools.Open cluster7 itemsTravel CalculatorsTrip budget, fuel, hotel, currency, baggage, and route planning tools.Open cluster7 itemsTech CalculatorsInternet speed, storage, downloads, battery, display, bitrate, and bandwidth tools.Open cluster1 itemsVehicle Import CalculatorsVehicle import cost and tax planning tools for CIF, duties, levies, and landed-cost estimation.Open cluster1 itemsProperty and Construction CalculatorsSpace for future mortgage, building-cost, rent, area, and construction-planning tools.Open cluster9 itemsBusiness CalculatorsPricing, profit, tax, invoicing, churn, and small-business planning calculators.Open clusterHubRatesPublished rate, tariff, and data-heavy pages.Open ratesHubCompareComparison landing pages for loans, deposits, solar, and imports.Open compareHubToolsLight utility tools such as Sinhala Unicode typing.Open tools
Utilities
Utilities
Billing, consumption, and household cost tools for Sri Lanka.
Electricity Bill CalculatorEstimate CEB or LECO bills with tariff, solar, and provider options.Open toolWater Bill CalculatorEstimate monthly household water charges with a Sri Lanka-focused layout.Open toolFuel PriceTrack Petrol 92, Auto Diesel, and Kerosene revisions in one chart.Open toolDraftSolar Savings CalculatorCompare import charges against solar export and savings assumptions.Open toolSolar CalculatorEstimate monthly and yearly solar generation from panel size in watts or kW.Open toolLPG Gas Cost CalculatorTrack refill costs and estimate monthly gas spending for home use.Open tool
Finance
Finance
Income, borrowing, and personal planning calculators.
Loan CalculatorEstimate monthly repayment, total interest, and total cost.Open toolLoan RatesView Sri Lanka bank personal-loan interest rates in a table without calculator inputs.Open toolSimple SalaryEnter one salary and instantly estimate APIT, EPF, ETF, and take-home pay.Open toolAPIT TaxUse the same quick salary logic with APIT-focused wording and results.Open toolAdvanced SalaryBuild a detailed payslip with earnings items, deductions, APIT, EPF, ETF, and employer cost.Open toolGov SalaryEstimate 2025 public-sector salary scales by code, step, and COLA.Open toolLeasing RatesCompare vehicle finance and leasing rates with repayment-focused checks.Open toolImport TaxEstimate CIF in rupees, import taxes, and total landed cost before you buy.Open toolMortgage RatesEstimate home-loan style mortgage repayments, total interest, and repayment structure.Open toolPawning RatesEstimate pledged amount repayment, monthly interest, and total pawning cost.Open toolSavings Goal CalculatorEstimate monthly savings needed to hit a target amount.Open toolFixed DepositCompare Sri Lanka fixed deposit rates across banks with maturity and monthly-interest options.Open toolFD RatesView Sri Lanka bank fixed deposit interest rates in a table without calculator inputs.Open toolTax CalculatorCalculate individual tax, APIT, VAT, SSCL, WHT, and company tax in one place.Open toolIncome TaxEstimate annual resident individual income tax with personal relief and monthly equivalent tax.Open tool
Health
Health
Body metrics, nutrition, hydration, and fitness planning calculators.
BMI CalculatorCheck body mass index using height and weight with standard adult BMI ranges.Open toolCalorie CalculatorEstimate daily calorie needs for maintenance, weight loss, or weight gain goals.Open toolBody Fat CalculatorEstimate body fat percentage from body measurements using standard formula-based methods.Open toolProtein Intake CalculatorEstimate daily protein intake targets based on weight, goal, and training intensity.Open toolTDEE CalculatorEstimate total daily energy expenditure from BMR and activity assumptions.Open toolIdeal Weight CalculatorEstimate an ideal weight range from height using common reference formulas.Open toolWater Intake CalculatorEstimate daily water intake targets based on body weight, activity, and climate assumptions.Open tool
Home Improvement
Home Improvement
Paint, tile, concrete, roof, wallpaper, flooring, and AC sizing tools.
PaintEstimate paint quantity from wall area, coats, and coverage.Open toolTileEstimate tile count, box count, and waste from area.Open toolConcreteEstimate concrete volume for slabs and simple pours.Open toolFlooringEstimate flooring coverage, packs, and waste.Open toolWallpaperEstimate wallpaper rolls from wall size and waste.Open toolRoof AreaEstimate roof surface area from footprint and pitch.Open toolAC BTUEstimate AC BTU size from room dimensions and heat load.Open tool
Pregnancy and Baby
Pregnancy and Baby
Due date, ovulation, feeding, sleep, baby age, and pregnancy planning tools.
Due DateEstimate due date from LMP or conception date.Open toolOvulationEstimate fertile window timing from cycle length.Open toolWeight GainEstimate recommended pregnancy weight gain ranges.Open toolFeeding AmountEstimate feeding amounts from age, weight, and frequency.Open toolSleep ScheduleEstimate baby or toddler nap timing and total sleep.Open toolBaby AgeCalculate baby age in weeks, months, and days.Open tool
Education
Education
Student tools for GPA, grades, exams, study time, and academic planning.
GPACalculate weighted or simple GPA from course grades and credits.Open toolGrade %Convert earned marks and total marks into a percentage.Open toolExam ScoreEstimate exam percentage or weighted score from sections.Open toolStudy TimeEstimate daily study hours needed before an exam.Open toolCitationsCount and total citations across sources or paper sections.Open toolFinal Exam ScoreCalculate the score needed on a final to reach a target grade.Open tool
Conversion
Conversion
Global unit and value converters for length, weight, area, time, and storage.
Cm to InchesConvert centimeters into inches instantly.Open toolKg to LbsConvert kilograms into pounds quickly.Open toolC to FConvert Celsius temperatures into Fahrenheit.Open toolLiters to GallonsConvert liters into gallons for capacity comparisons.Open toolSq Ft to Sq MConvert square feet into square meters.Open toolTime ZoneConvert times between time zones.Open toolFile SizeConvert KB, MB, GB, and TB across storage units.Open tool
Language
Language
Typing, script, and language-support tools for Sri Lanka.
Telecom
Telecom
Package and usage tools inspired by Sri Lankan bill-checking workflows.
Internet CalculatorBrowse internet, fibre, and mobile package-focused tools.Open toolDialog Package CalculatorCompare reload value against common mobile package assumptions.Open toolDialog Tax CalculatorEstimate effective tax on Dialog bills by service category.Open toolMobitel Tax CalculatorEstimate effective tax on Mobitel billed services by official category.Open toolMobitel Package CalculatorEstimate value from data and voice package choices.Open toolAirtel Package CalculatorCheck package cost against expected data use.Open toolHutch Package CalculatorCompare Hutch-style reload and usage patterns.Open toolSLT Fibre Usage CalculatorEstimate broadband usage balance and expected overage behavior.Open toolSLT Tax CalculatorEstimate effective tax on SLT internet, voice, and PEOTV bills.Open tool
Business
Business
Profit, markup, break-even, VAT, ROI, churn, and invoicing calculators.
TaxCalculate individual tax, APIT, VAT, SSCL, WHT, and company tax in one place.Open toolProfit MarginCalculate profit margin from revenue and cost values.Open toolMarkupCalculate markup percentage and selling price from cost.Open toolBreak-EvenEstimate break-even units or revenue from fixed and variable costs.Open toolVAT/TaxAdd or remove VAT or sales tax from prices.Open toolInvoice Due DateCalculate invoice due dates from issue dates and terms.Open toolROICalculate return on investment from cost and gain.Open toolChurn RateCalculate customer churn rate from customer counts.Open tool
Salary and Work
Salary and Work
Hourly, overtime, freelance, shift, and work-hour planning calculators.
Hourly to SalaryConvert hourly pay into weekly, monthly, and annual salary.Open toolOvertimeEstimate overtime earnings from pay rate and extra hours.Open toolTake-Home PayEstimate net pay from gross pay, taxes, and deductions.Open toolFreelance RateEstimate freelance rates from income targets and billable time.Open toolWork HoursCalculate total work hours from clock-in, break, and clock-out times.Open toolShift DifferentialEstimate extra pay for night, weekend, or premium shifts.Open tool
Travel
Travel
Trip budget, hotel, fuel, baggage, and currency fee calculators.
Bus Fare 2026Check the March 2026 Sri Lanka bus fare revision by service type and fare stage.Open toolTrip BudgetEstimate total trip cost from transport, hotel, food, and activities.Open toolFuel CostEstimate fuel cost for a trip from distance and efficiency.Open toolMiles to KmConvert trip distance between miles and kilometers.Open toolHotel CostEstimate total hotel spend including nights, taxes, and fees.Open toolExchange FeeEstimate currency exchange fees and effective rates.Open toolLuggage WeightEstimate baggage totals against airline allowance limits.Open tool
Tech
Tech
Internet, download, storage, battery, bitrate, and bandwidth calculators.
Internet SpeedConvert between Mbps, MB/s, and transfer speeds.Open toolStorageEstimate storage needs from files, media, and retention.Open toolDownload TimeEstimate download duration from file size and internet speed.Open toolBattery LifeEstimate battery runtime from capacity and power draw.Open toolScreen SizeEstimate screen dimensions from diagonal size and aspect ratio.Open toolBitrateEstimate bitrate from file size and duration.Open toolBandwidthEstimate required bandwidth from users, bitrate, or usage.Open tool