🧮 Calculators tools

136 free Calculators tools. Each one runs right in your browser: no sign-up, no watermark, and your files stay on your device.

• ٪ Percentage Calculator Work out X% of Y, what percent one number is of another, and percentage change.
• 🎂 Age Calculator Your exact age in years, months and days, total days lived and days to your next birthday.
• 📅 Days Between Dates Count the days, weeks and months between two dates, or add days to a date.
• 💵 Simple Interest Calculator Interest and total amount on a principal at simple interest.
• 📈 Compound Interest Calculator Grow a sum with yearly, quarterly, monthly or daily compounding, plus optional monthly additions.
• 🏷️ Discount Calculator Sale price and savings after a discount, even “20% + extra 10% off”.
• 🍽️ Tip Calculator and Bill Splitter Tip amount, total and each person’s share of a restaurant bill.
• 🧾 GST Calculator (India) Add or remove GST at 0.25%, 3%, 5%, 12%, 18%, 28% or 40% with the CGST/SGST or IGST split.
• 🌍 VAT Calculator Add or remove VAT with the standard rate of 20+ countries, or any rate.
• 🇺🇸 Sales Tax Calculator (US) Add state and local sales tax to a price, or find the price before tax.
• ⚖️ BMI Calculator Body Mass Index in kg/cm or lb/ft, your category and healthy weight range.
• 🔥 BMR Calculator Basal metabolic rate and daily calories for each activity level.
• 📐 Body Fat Calculator Estimate body fat % from a few tape measurements.
• 🤰 Pregnancy Due Date Calculator Estimated due date, how many weeks pregnant you are, and your trimester.
• 🌸 Ovulation Calculator Your likely ovulation day and fertile window for the next six cycles.
• 💧 Water Intake Calculator Daily water in litres, glasses and ounces for your weight, exercise and climate.
• 🎓 GPA and CGPA Calculator GPA on the 4.0 scale, CGPA on the 10-point scale, and CGPA to percentage.
• 📝 Final Grade Calculator The score you need on the final exam to reach the grade you want.
• 📊 Average Calculator Mean, median, mode, standard deviation, range and sum of a list of numbers.
• ➗ Ratio Calculator Solve proportions, simplify a ratio and turn it into 1 : n.
• 💼 Salary and Hourly Wage Calculator Turn any pay into hourly, daily, weekly, monthly and yearly figures.
• 🎈 Inflation Calculator What something will cost in the future, and what your money will be worth.
• ⛽ Fuel Cost Calculator Fuel and money needed for a trip in km/l, L/100 km or mpg, and each person’s share.
• 💡 Electricity Bill Calculator Units and cost of running an appliance per day, month and year.
• 💹 Profit Margin Calculator Profit, margin and markup, or the selling price for the margin you want.
• ⚖️ Break-even Calculator How many units you must sell to cover fixed costs.
• 📈 ROI Calculator Total and yearly return on any investment.
• ⏱️ Hours and Minutes Calculator Add or subtract times like 1:30 + 2:45 and see the total in hours and minutes.
• 💘 Love Calculator A just-for-fun love score from two names.
• 🏦 Loan EMI Calculator Monthly EMI, total interest and a year-by-year repayment table for any loan.
• 🚗 Car Loan Calculator Car loan EMI after your down payment, total interest and the real cost of the car.
• 🏠 Home Loan Prepayment Calculator See how extra monthly or lump-sum payments shorten your home loan and save interest.
• 🏡 Mortgage Calculator Monthly mortgage payment with principal, interest, property tax, insurance and HOA.
• 📈 SIP Calculator Future value of a monthly SIP, money invested and gains, year by year.
• 🪜 Step-up SIP Calculator Returns from a SIP that increases by a percentage every year.
• 💰 Lump Sum Investment Calculator What a one-time investment grows to at a yearly return.
• 🏧 SWP Calculator How long your money lasts with fixed monthly withdrawals, and the balance left.
• 📊 CAGR Calculator The yearly growth rate between a start and end value.
• 🧮 XIRR Calculator Yearly return for investments made and taken out on different dates, like Excel XIRR.
• 📉 NPV and IRR Calculator Net present value and internal rate of return of yearly cash flows.
• 🏦 FD Calculator Maturity amount and interest on a bank fixed deposit, with senior citizen rates and payout options.
• 🗓️ RD Calculator Maturity value of a bank recurring deposit from monthly instalments.
• 🏖️ Retirement Calculator Retirement corpus needed for your expenses with inflation, and the monthly SIP to get there.
• 🎯 Goal Planner Future cost of a goal and the monthly SIP or lump sum needed.
• 🛟 Emergency Fund Calculator Your emergency fund target and how much to save each month.
• 🧾 Net Worth Calculator Add up what you own and what you owe to see your net worth.
• 🗂️ Budget Calculator (50/30/20) Split your income into needs, wants and savings with the 50/30/20 rule or your own split.
• 💹 Stock and Crypto Profit Calculator Profit or loss on shares or crypto after fees, and the break-even selling price.
• 🪙 Dividend Yield Calculator Dividend yield and your yearly dividend income.
• 🏘️ HRA Exemption Calculator Tax-exempt and taxable HRA under Section 10(13A).
• 🎖️ Gratuity Calculator Gratuity on leaving a job after 5+ years, with the 15/26 rule.
• 🧾 TDS Calculator TDS to deduct on professional fees, contracts, commission, rent, interest and more.
• 🇮🇳 Income Tax Calculator (India) Compare your tax in the old and new regimes with the latest slabs, rebate and cess.
• 🇬🇧 UK Income Tax Calculator Take-home pay after Income Tax and employee NI for 2026/27.
• 🇺🇸 US Federal Income Tax Calculator Federal income tax, effective and marginal rate for 2026.
• 💵 Take-home Pay Calculator Net pay per month, fortnight or week after tax and deductions.
• ⏰ Overtime Pay Calculator Regular and overtime pay at 1.25×, 1.5× or 2×.
• 💻 Freelance Rate Calculator The minimum hourly and day rate to reach your income goal.
• ⚖️ Loan Comparison Calculator Compare two loan offers by EMI and total cost including fees.
• 🔑 Rent vs Buy Calculator Compare buying a home with renting and investing the difference.
• 📉 Depreciation Calculator Yearly depreciation and book value by straight-line, WDV or double-declining method.
• 💳 Credit Card Payoff Calculator Months to clear a card balance and the interest you will pay.
• 📈 Statistics and Regression Calculator Mean, variance, standard deviation, line of best fit, r and R² for your data.
• 🎲 Probability Calculator Chance of A and B, A or B, neither, and an event over repeated tries.
• 🔢 Permutation and Combination Calculator Permutations and combinations of n items taken r at a time, even for big numbers.
• ⅹ² Quadratic Equation Solver Solve ax² + bx + c = 0, including complex roots, with the discriminant and vertex.
• 🧮 LCM and HCF Calculator Lowest common multiple and highest common factor of two or more numbers.
• 🔍 Prime Number Checker Check if a number is prime, see its prime factors, divisors and the next prime.
• √ Square Root Calculator Square, cube and any root of a number, plus squares and cubes.
• ⁽ⁿ⁾ Exponent Calculator Raise any number to any power, including fractions and negatives.
• ㏒ Logarithm Calculator Logarithms in any base, natural log, log₁₀, log₂ and eˣ.
• 📶 Percentage Change Calculator Percentage increase or decrease between two values, and percentage difference.
• ⭕ Rounding Calculator Round to decimal places or significant figures, up, down or half to even.
• 🔟 Big Number Calculator Add, subtract, multiply and divide whole numbers of any length exactly.
• ½ Decimal to Fraction Converter Turn decimals into fractions and fractions into decimals, with repeating digits shown.
• ➗ Long Division Calculator Divide step by step, with quotient and remainder.
• 📐 Triangle Calculator Solve a triangle from three sides, two sides and an angle, or two angles and a side.
• ∡ Trigonometry Calculator sin, cos, tan, cot and their inverses in degrees or radians.
• ➡️ Vector Calculator Dot and cross products, sum, difference, magnitudes and the angle between two vectors.
• ▦ Matrix Calculator Determinant, inverse, transpose, product, sum and difference of matrices of any size.
• ⅗ Fraction Calculator Add, subtract, multiply and divide fractions and mixed numbers, in simplest form.
• 🍽️ Calorie Calculator Calories a day to keep, lose or gain weight, from your age, size and activity.
• 🥗 Macro Calculator Daily grams of protein, carbs and fat for your calories and diet plan.
• 🥚 Protein Intake Calculator Daily protein in grams for your weight and activity, with food examples.
• ❤️ Heart Rate Zone Calculator Your maximum heart rate and training zones 1–5, with the Karvonen method.
• 🏃 Running Pace Calculator Pace per km and per mile, speed, and predicted 5K, 10K, half and full marathon times.
• 🔥 Calories Burned Calculator Calories burned by 15 common activities for your weight and time.
• 😴 Sleep Calculator Bedtimes or wake-up times that fit 90-minute sleep cycles.
• 🌸 Period Calculator Your next period dates and likely ovulation for the next six cycles.
• 🍺 Blood Alcohol Calculator A rough estimate of blood alcohol and time to sober up.
• 📏 Waist-to-hip Ratio Calculator Your waist-to-hip ratio and what it means for health risk.
• 💪 Lean Body Mass Calculator Estimated lean body mass from height and weight.
• 💊 Child Medicine Dose Calculator Weight-based dose of children’s paracetamol or ibuprofen syrup, in ml. Information only.
• 🏗️ Concrete Calculator Cement bags, sand and aggregate for a slab or floor, for M10 to M25 mixes.
• 🎨 Paint Calculator Litres of paint and primer for a room’s walls (and ceiling).
• 🧱 Tile Calculator Tiles and boxes for a floor or wall, with wastage.
• 🖼️ Wallpaper Calculator Rolls of wallpaper needed for your walls and pattern repeat.
• 🧱 Brick Calculator Number of bricks and cement for a 4.5-inch or 9-inch wall.
• 🏠 Roof Pitch Calculator Roof angle, pitch, rafter length and roof area.
• ❄️ AC Size Calculator Suggested AC size in tons and BTU for your room.
• ☀️ Solar Panel Calculator Panels and system size for your electricity use, savings and payback time.
• 🔋 Inverter and Battery Calculator Battery Ah and inverter VA for your load and backup hours.
• 🛢️ Water Tank Capacity Calculator Capacity of round, rectangular or horizontal tanks in litres and gallons.
• 👩‍🍳 Recipe Scaler Scale every ingredient of a recipe for more or fewer people.
• 🤝 Split Expenses Calculator Settle shared trip or flat expenses with the fewest payments.
• 🐶 Dog and Cat Age Calculator Your pet’s age in human years by size.
• 🧳 Trip Cost Calculator Total and per-person cost of a road trip.
• 🛒 Unit Price Calculator Compare packs by price per gram, ml or piece.
• 📆 Working Days Calculator Working days between two dates, skipping weekends and holidays.
• 👫 Age Difference Calculator The exact age gap between two people in years, months and days.
• 🎉 Birthday Calculator The weekday you were born, days to your next birthday, and your star sign and Chinese zodiac.
• ⚡ Ohm's Law Calculator Enter any two of voltage, current, resistance and power to get the other two.
• 🌈 Resistor Colour Code Calculator Pick the band colours to read a resistor’s value and tolerance.
• 🔌 Voltage Drop Calculator Voltage lost along a cable for single-phase, three-phase or DC supplies.
• 💡 Electrical Power Calculator Power in watts, kilowatts and horsepower from voltage, current and power factor.
• 🔋 Battery Life Calculator How long a battery lasts from its mAh capacity and the current your device draws.
• 🧵 Wire Size Calculator The cable size you need for a load, checking voltage drop and current rating.
• ⚗️ Molar Mass Calculator Molar mass of any chemical formula, with brackets and hydrates, plus moles from grams.
• 🧪 Molarity & Dilution Calculator Molarity from mass, the mass to weigh out, and dilution volumes.
• ☢️ Half-Life Calculator The amount left after any time, given the half-life.
• 🎯 Projectile Motion Calculator Range, highest point and time of flight from launch speed, angle and height.
• 🏋️ Force, Work & Power Calculator Force from mass and acceleration, the work done and the power used.
• 🚀 Kinetic & Potential Energy Calculator Kinetic energy from mass and speed, potential energy from height.
• ⚙️ Gear Ratio Calculator Gear ratio, output rpm and torque from tooth counts.
• 🏗️ Beam Load Calculator Deflection, bending moment and shear for simply supported and cantilever beams.
• 💧 Dew Point Calculator The dew point and how humid it feels, from temperature and relative humidity.
• 🌡️ Wind Chill & Heat Index Calculator How cold or hot it really feels, with health advice.
• 🔊 Decibel Calculator Add sound levels, find loudness at a distance and convert ratios to decibels.
• 🔍 Lens Calculator Image distance, magnification and lens power from focal length and object distance.
• 🧮 Calculator A simple calculator with percent, memory and a history of your sums.
• 🔬 Scientific Calculator Trig, logs, powers, roots, factorials and nCr, in degrees or radians.
• 📈 Graphing Calculator Plot up to six functions, zoom and pan, and see where they cross zero.
• ∂ Derivative & Integral Calculator Exact derivatives (1st, 2nd, 3rd), the slope at a point, the tangent line and definite integrals.
• 🟰 Equation Solver Solve any equation in x numerically, or linear systems with up to 4 unknowns.
• 🏦 FD and RD Calculator Work out the maturity value and interest of a fixed deposit (FD) or recurring deposit (RD), with quarterly or monthly compounding.
• 📉 Graph Plotter Plot your x and y data as points, a line or bars, add a linear, quadratic, exponential, log or power trend line, and see its equation and R².