Free online calculators

82 calculators that run entirely in your browser — free, no signup, no tracking. Part of the Finance & Math group.

• Age CalculatorAge Calculator — free online tool. Counted the way a calendar counts: the leap days and month lengths are handled, so the years/months/days answer is what you would write on a form. Works on mobile and offline.
• Percentage CalculatorPercentage Calculator — free online tool. This is the everyday percentage case: GST on a price, a tip, a discount, a salary hike. Works on mobile and offline.
• EMI CalculatorEMI Calculator — free online tool. The EMI is fixed for the whole tenure. Works on mobile and offline.
• GST CalculatorGST Calculator — free online tool. Use Add GST when you know the pre-tax price, and Remove GST when the bill already includes tax — the two directions give different answers, which is the most common GST arithmetic mistake. Works on mobile and offline.
• SIP CalculatorSIP Calculator — free online tool. The result depends entirely on how long you stay invested, not on timing the market. Works on mobile and offline.
• BMI CalculatorCalculate your BMI using your weight and height. Understand your weight category: underweight, normal, overweight, or obese.
• Date Difference CalculatorFind the difference between two dates. This calculator provides the total days, and the breakdown in years, months, and days.
• Discount CalculatorUse this free discount calculator to find the final price of an item after a discount. Enter the original price and the discount percentage.
• Simple Interest CalculatorCalculate simple interest. Enter principal, annual interest rate, and time in years to find interest and total amount.
• Compound Interest CalculatorCompound Interest Calculator — free online tool. Interest on interest is the whole story here. Works on mobile and offline.
• Loan Eligibility CalculatorLoan Eligibility Calculator — free online tool. Lenders use the FOIR rule: total EMIs should stay under about half of your monthly income. Works on mobile and offline.
• Random Number GeneratorRandom Number Generator — free online tool. Both the minimum and maximum can come up, and every whole number between them is equally likely. Works on mobile and offline.
• Fuel Cost CalculatorFuel Cost Calculator — free online tool. Real-world mileage is usually 10–15% lower than the claimed figure, especially in city traffic with the air-conditioner on. Works on mobile and offline.
• Tip CalculatorTip Calculator — free online tool. Splitting happens after the tip is added, and the per-person figure already includes both. Works on mobile and offline.
• Days Until CalculatorDays Until Calculator — free online tool. Both dates are normalised to midnight, so the answer does not shift depending on what time of day you check. Works on mobile and offline.
• Percentage Difference CalculatorPercentage Difference Calculator — free online tool. Percentage difference compares two values with neither treated as the starting point, and it is not the same as percentage change. Works on mobile and offline.
• Aspect Ratio CalculatorAspect Ratio Calculator — free online tool. Enter either dimension to get the matching one without distortion. Works on mobile and offline.
• Sales Tax CalculatorSales Tax Calculator — free online tool. Use it for VAT, sales tax, service tax or a state-level cess. Works on mobile and offline.
• FD CalculatorFD Calculator — free online tool. Quarterly compounding pays noticeably more than yearly on the same rate. Works on mobile and offline.
• PPF CalculatorPPF Calculator — free online tool. PPF is compounded annually and the interest is tax-free under EEE. Works on mobile and offline.
• Lumpsum CalculatorLumpsum Calculator — free online tool. A lumpsum grows on the whole amount from day one, so it beats a staggered monthly plan when markets rise steadily. Works on mobile and offline.
• SWP CalculatorSWP Calculator — free online tool. A SWP survives when the withdrawal rate stays below the return rate: ₹30,000/month from ₹50L needs only 7. Works on mobile and offline.
• Gratuity CalculatorGratuity Calculator — free online tool. Gratuity needs at least five years of continuous service, and the statutory exemption stops at ₹20 lakh. Works on mobile and offline.
• HRA Exemption CalculatorHRA Exemption Calculator — free online tool. HRA exemption only applies under the old tax regime. Works on mobile and offline.
• Income Tax CalculatorIncome Tax Calculator — free online tool. Both regimes are computed so you can compare — the cheaper one depends almost entirely on how large your deductions are. Works on mobile and offline.
• Salary In-Hand CalculatorSalary In-Hand Calculator — free online tool. The gap between CTC and in-hand comes from PF, gratuity, insurance and the variable part that is not guaranteed. Works on mobile and offline.
• Home Loan EMI CalculatorHome Loan EMI Calculator — free online tool. The EMI is fixed for the whole tenure. Works on mobile and offline.
• GST Calculator Reverse ChargeGST Calculator Reverse Charge — free online tool. Use Add GST when you know the pre-tax price, and Remove GST when the bill already includes tax — the two directions give different answers, which is the most common GST arithmetic mistake. Works on mobile and offline.
• PAN Card ValidatorPAN Card Validator — free online tool. The validator reads the structure rather than a government database, so a format-valid PAN may still be cancelled or inactive. Works on mobile and offline.
• What is X Percent of YWhat is X Percent of Y — free online tool. This is the everyday percentage case: GST on a price, a tip, a discount, a salary hike. Works on mobile and offline.
• Aadhaar Number ValidatorAadhaar Number Validator — free online tool. The checksum catches the common mistakes — a mistyped digit or two swapped digits — without any database lookup. Works on mobile and offline.
• GSTIN ValidatorGSTIN Validator — free online tool. The last character is a checksum computed from the other fourteen, so a single mistyped character is caught immediately. Works on mobile and offline.
• IFSC Code ValidatorIFSC Code Validator — free online tool. Format validation catches the everyday errors: a missing 0 in the middle, a lowercase letter, or a swapped branch code. Works on mobile and offline.
• Indian Mobile Number ValidatorIndian Mobile Number Validator — free online tool. Numbers starting 1–5 are landlines or special services, which is the most common fake-number giveaway in forms. Works on mobile and offline.
• PIN Code ValidatorPIN Code Validator — free online tool. The first digit alone narrows the address to a region — 1 for Delhi–Punjab, 4 for Maharashtra, 6 for Tamil Nadu–Kerala. Works on mobile and offline.
• Vehicle Number ValidatorVehicle Number Validator — free online tool. The decoder reads which state and RTO office issued the plate. Works on mobile and offline.
• Land Area Converter (India)Land Area Converter (India) — free online tool. Land units are genuinely regional in India: a bigha in Bihar is roughly half of the pucca bigha used here, and parts of Bengal use a smaller one again. Works on mobile and offline.
• Numerology Number CalculatorNumerology Number Calculator — free online tool. This is the classic Pythagorean system used by most numerology charts. Works on mobile and offline.
• UPI Payment Link GeneratorUPI Payment Link Generator — free online tool. The link is a web standard that any UPI app — GPay, PhonePe, Paytm, BHIM — understands. Works on mobile and offline.
• IMEI ValidatorIMEI Validator — free online tool. The Luhn check catches every single-digit typo and most transpositions. Works on mobile and offline.
• Number to WordsNumber to Words — free online tool. The two systems group digits differently, which is why 1,50,00,000 and 15,000,000 are the same number written two ways. Works on mobile and offline.
• Event Countdown CalculatorEvent Countdown Calculator — free online tool. The countdown is calendar-accurate across months and leap years. Works on mobile and offline.
• Income Tax Calculator New RegimeIncome Tax Calculator New Regime — free online tool. Both regimes are computed so you can compare — the cheaper one depends almost entirely on how large your deductions are. Works on mobile and offline.
• Age Calculator in MonthsAge Calculator in Months — free online tool. Counted the way a calendar counts: the leap days and month lengths are handled, so the years/months/days answer is what you would write on a form. Works on mobile and offline.
• BMR CalculatorBMR Calculator — free online tool. BMR is the energy you would burn lying still all day. Works on mobile and offline.
• Percentage to Marks CalculatorPercentage to Marks Calculator — free online tool. This is the everyday percentage case: GST on a price, a tip, a discount, a salary hike. Works on mobile and offline.
• GST Number CheckerGST Number Checker — free online tool. The last character is a checksum computed from the other fourteen, so a single mistyped character is caught immediately. Works on mobile and offline.
• Instagram Engagement Rate CalculatorCalculate your Instagram engagement rate. Input likes, comments, shares, and followers to get your post's performance.
• Affiliate Commission CalculatorAffiliate Commission Calculator — free online tool. This is the everyday percentage case: GST on a price, a tip, a discount, a salary hike. Works on mobile and offline.
• Car Loan EMI CalculatorCar Loan EMI Calculator — free online tool. The EMI is fixed for the whole tenure. Works on mobile and offline.
• GST Inclusive CalculatorGST Inclusive Calculator — free online tool. Use Add GST when you know the pre-tax price, and Remove GST when the bill already includes tax — the two directions give different answers, which is the most common GST arithmetic mistake. Works on mobile and offline.
• Income Tax Calculator Old RegimeIncome Tax Calculator Old Regime — free online tool. Both regimes are computed so you can compare — the cheaper one depends almost entirely on how large your deductions are. Works on mobile and offline.
• X is What Percent of YX is What Percent of Y — free online tool. Use this when you know the two numbers and want the ratio as a percentage — test scores, conversion rates, what share of revenue a product brings in. Works on mobile and offline.
• Age Difference CalculatorAge Difference Calculator — free online tool. Counted the way a calendar counts: the leap days and month lengths are handled, so the years/months/days answer is what you would write on a form. Works on mobile and offline.
• BMR Calculator FemaleBMR Calculator Female — free online tool. BMR is the energy you would burn lying still all day. Works on mobile and offline.
• Test Score CalculatorTest Score Calculator — free online tool. Use this when you know the two numbers and want the ratio as a percentage — test scores, conversion rates, what share of revenue a product brings in. Works on mobile and offline.
• YouTube Money CalculatorCalculate your potential YouTube ad revenue. Input monthly views, CPM, monetized playback share, and your revenue share.
• Image Aspect Ratio ResizerImage Aspect Ratio Resizer — free online tool. Enter either dimension to get the matching one without distortion. Works on mobile and offline.
• Content Freshness CalculatorContent Freshness Calculator — free online tool. Both dates are normalised to midnight, so the answer does not shift depending on what time of day you check. Works on mobile and offline.
• Personal Loan EMI CalculatorPersonal Loan EMI Calculator — free online tool. The EMI is fixed for the whole tenure. Works on mobile and offline.
• GST Calculator 5 PercentGST Calculator 5 Percent — free online tool. Use Add GST when you know the pre-tax price, and Remove GST when the bill already includes tax — the two directions give different answers, which is the most common GST arithmetic mistake. Works on mobile and offline.
• Percentage Increase CalculatorPercentage Increase Calculator — free online tool. The base is always the old value, so a rise and a following fall of the same percent do not cancel out. Works on mobile and offline.
• Age Calculator by Date of BirthAge Calculator by Date of Birth — free online tool. Counted the way a calendar counts: the leap days and month lengths are handled, so the years/months/days answer is what you would write on a form. Works on mobile and offline.
• Ideal Weight CalculatorIdeal Weight Calculator — free online tool. The Devine formula gives a single reference number for drug dosing and clinical use, so it is narrow by design. Works on mobile and offline.
• Cut Off Mark CalculatorCut Off Mark Calculator — free online tool. This is the everyday percentage case: GST on a price, a tip, a discount, a salary hike. Works on mobile and offline.
• HSL to HEX ConverterHSL to HEX Converter — free online tool. Fast, private, no signup. Works on mobile and offline.
• Screen Resolution CalculatorCalculate screen resolution. Find aspect ratio or new width/height from original dimensions. Maintain aspect ratio for scaling.
• Print Size CalculatorPrint Size Calculator — free online tool. The same 1920 px image is a sharp 6×4-inch print at 300 DPI and a blurry A3 poster. Works on mobile and offline.
• Two Wheeler Loan EMI CalculatorCalculate your bike loan EMI. Enter the loan amount, interest rate, and tenure to get your monthly payment, total interest, and total amount payable.
• IGST CalculatorIGST Calculator — free online tool. Use Add GST when you know the pre-tax price, and Remove GST when the bill already includes tax — the two directions give different answers, which is the most common GST arithmetic mistake. Works on mobile and offline.
• CMYK to RGB ConverterCMYK to RGB Converter — free online tool. Fast, private, no signup. Works on mobile and offline.
• Percentage Change CalculatorPercentage Change Calculator — free online tool. The base is always the old value, so a rise and a following fall of the same percent do not cancel out. Works on mobile and offline.
• Date Calculator Add DaysDate Calculator Add Days — free online tool. Adding days is calendar-aware, so month ends and leap years just work — 2026-01-31 plus 30 days lands on 2026-03-02. Works on mobile and offline.
• Days Between Two DatesDays Between Two Dates — free online tool. Returns both the calendar breakdown and the raw day count. Works on mobile and offline.
• Water Intake CalculatorDetermine your daily water intake. This calculator uses your weight and activity level to estimate how much water you need.
• Graduation Percentage CalculatorCalculate your graduation percentage. Enter the marks you obtained and the total maximum marks to find your percentage.
• Pomodoro Schedule Planner
• Study Session PlannerStudy Session Planner — free online tool. Fast, private, no signup. Works on mobile and offline.
• Work Hours and Pay CalculatorWork Hours and Pay Calculator — free online tool. Fast, private, no signup. Works on mobile and offline.
• Shift Pay CalculatorShift Pay Calculator — free online tool. Fast, private, no signup. Works on mobile and offline.
• Nap PlannerNap Planner — free online tool. Fast, private, no signup. Works on mobile and offline.
• Coffee Nap PlannerCoffee Nap Planner — free online tool. Fast, private, no signup. Works on mobile and offline.