All Tools

Every free calculator and tool on HandyReckon — 107 tools in total, grouped by category. Browse by section or jump to the A–Z index below.

Finance

  • Amortization Schedule — Generate a full month-by-month amortization table showing the principal and interest split for every payment.
  • Auto Loan Calculator — Calculate monthly car payments, total interest, and true cost of ownership for any auto loan.
  • Compound Interest Calculator — See how your savings or investment grows with compound interest over time.
  • Credit Card Payoff Calculator — Compare the cost of paying only the minimum versus a fixed monthly payment on your credit card balance.
  • Debt Payoff Planner — Compare the snowball (smallest balance first) and avalanche (highest rate first) debt payoff strategies side by side.
  • Debt-to-Income Ratio Calculator — Calculate your debt-to-income (DTI) ratio and see how lenders evaluate your ability to take on new debt.
  • Discount Calculator — Find the sale price after a percentage discount, or work out what discount was applied.
  • Down Payment Calculator — Calculate the down payment amount needed for any home price and see how long it will take to save.
  • Fuel Cost Calculator — Estimate the fuel cost of any trip given distance, fuel efficiency, and price per litre.
  • Future Value Calculator — Calculate how much your savings or investment will grow over time with compound interest and regular contributions.
  • House Affordability Calculator — Estimate the maximum home price you can afford based on income, existing debts, down payment, and interest rate.
  • Loan Calculator — Calculate monthly EMI payments and see the full amortization schedule for any loan.
  • Margin & Markup Calculator — Calculate profit margin, markup percentage, and selling price from cost and revenue.
  • Mortgage Calculator — Calculate monthly mortgage payments with optional tax, insurance, and extra payments to see interest saved.
  • Personal Loan Calculator — Calculate the monthly payment and total interest for any personal loan amount, rate, and term.
  • Present Value Calculator — Calculate the present value (PV) of a future sum using a discount rate to understand what future money is worth today.
  • ROI Calculator — Calculate ROI as a percentage and annualized return for any investment given cost and final value.
  • Salary to Hourly Converter — Convert annual salary to hourly, daily, weekly, and monthly pay — and back again.
  • Sales Tax / VAT / GST Calculator — Calculate the tax amount and total price for any sale price and tax rate.
  • Simple Interest Calculator — Calculate simple interest earned on a principal amount over time at a fixed rate.
  • Sri Lanka EPF & ETF Calculator — Calculate EPF and ETF contributions and take-home pay for any Sri Lankan salary.
  • Sri Lanka Income Tax Calculator — Calculate Sri Lanka APIT/PAYE income tax for any monthly or annual salary using current IRD slab rates.
  • Sri Lanka Leasing Calculator — Compare flat-rate and reducing-balance lease calculations to see the true cost difference between the two methods.
  • Tip Calculator — Calculate the tip amount and total bill, with optional bill-splitting by number of people.
  • Zakat Calculator — Calculate your Zakat due by entering your assets, liabilities, and current gold or silver price per gram.

Health & Fitness

  • BMI Calculator — Calculate your Body Mass Index with metric or imperial inputs and see your weight category.
  • BMR Calculator — Calculate your Basal Metabolic Rate using the gold-standard Mifflin-St Jeor equation.
  • Body Fat Calculator — Estimate body fat percentage using the clinically validated U.S. Navy circumference method.
  • Calorie Calculator — Estimate your daily calorie needs based on age, weight, height, sex, and activity level.
  • Due Date Calculator — Calculate your estimated due date by last period or conception date, with weeks pregnant and trimester shown.
  • Ideal Weight Calculator — See your ideal weight from three medical formulas (Devine, Robinson, Hamwi) plus your healthy BMI weight range.
  • Macro Calculator — Calculate your daily protein, carbs, and fat targets based on your calorie needs and fitness goal.
  • One-Rep Max Calculator — Estimate your 1RM for any lift using Epley and Brzycki formulas, plus a training percentage table.
  • Ovulation Calculator — Find your ovulation date and fertile window based on your cycle length and last period, for the next 3 cycles.
  • Period Calculator — Predict your next three period start dates based on your last period and average cycle length. Nothing is stored.
  • Protein Intake Calculator — Calculate your daily protein intake goal based on body weight, activity level, and whether you want to maintain, lose, or build muscle.
  • Running Pace Calculator — Calculate pace, time, or distance for any run. Includes race presets for 5K, 10K, half marathon, and marathon.
  • Sleep Calculator — Find the best bedtime or wake time based on 90-minute sleep cycles and a 15-minute fall-asleep buffer.
  • TDEE Calculator — Calculate your Total Daily Energy Expenditure — the calories needed to maintain your weight.

Math & Numbers

  • Average Calculator — Find the arithmetic mean of any set of numbers with a clear step-by-step breakdown.
  • Fraction Calculator — Add, subtract, multiply, or divide fractions and mixed numbers with step-by-step working shown.
  • GPA Calculator — Calculate your GPA from course grades and credit hours using the standard 4.0 scale.
  • Grade Calculator — Calculate your current grade and find what score you need on the final exam to reach your target grade.
  • LCM & GCF Calculator — Calculate the LCM and GCF of up to 10 numbers with full prime factorization working shown.
  • Percentage Calculator — Calculate percentages three ways: percentage of, what percent, and percentage change.
  • Prime Factorization Calculator — Find the prime factors of any positive integer with a factor tree diagram and prime factor notation shown.
  • Probability Calculator — Calculate the probability of single and combined events, including AND, OR, and NOT logic.
  • Pythagorean Theorem Calculator — Find any side of a right triangle using a² + b² = c². Enter two sides and solve for the third.
  • Quadratic Equation Solver — Solve ax² + bx + c = 0 for real or complex roots with discriminant analysis and step-by-step working.
  • Ratio Calculator — Simplify ratios, find missing values in proportions, and scale ratios by any factor.
  • Slope Calculator — Find the slope, y-intercept, and equation of a line from two coordinate points with full working.
  • Standard Deviation Calculator — Calculate mean, variance, and standard deviation for any dataset with step-by-step working shown.

Dates & Time

  • Add or Subtract Days — Add or subtract any number of days from a date and find the resulting date instantly.
  • Age Calculator — Calculate your exact age in years, months, days, hours, and minutes from any birth date.
  • Countdown Calculator — Count down the exact days, hours, and minutes remaining until any future date.
  • Date Difference Calculator — Find the exact number of days, weeks, months, and years between any two dates.
  • Hours Calculator — Add or subtract hours and minutes to calculate total time worked or elapsed time.
  • Time Zone Converter — Compare the current time across up to 4 cities worldwide with automatic DST handling.

Converters

  • Air Fryer Converter — Convert conventional oven temperature and time to air fryer settings using the standard reduction rule.
  • Angle Converter — Convert between degrees, radians, gradians, and other angle units instantly.
  • Area Converter — Convert square feet, acres, hectares, square meters, and more with one click.
  • Cups to Grams Converter — Convert cups to grams for any baking ingredient using accurate per-ingredient density data.
  • Data Storage Converter — Convert between bytes, KB, MB, GB, TB, and other storage units with precision.
  • Energy Converter — Convert joules, calories, kilowatt-hours, BTU, and other energy units instantly.
  • Frequency Converter — Convert between hertz, kilohertz, megahertz, gigahertz, and other frequency units.
  • Length Converter — Convert meters, feet, inches, kilometers, miles, and 15 other length units instantly.
  • Pressure Converter — Convert PSI, bar, pascal, atmosphere, and other pressure units with instant results.
  • Speed Converter — Convert mph, km/h, knots, meters per second, and other speed units instantly.
  • Temperature Converter — Convert between Celsius, Fahrenheit, and Kelvin with instant results in all three.
  • Time Converter — Convert hours, minutes, seconds, days, weeks, and other time units with ease.
  • Unit Converter — All-in-one unit converter covering length, weight, temperature, volume, and more.
  • Volume Converter — Convert liters, gallons, cups, milliliters, fluid ounces, and other volume units.
  • Weight Converter — Convert kilograms, pounds, ounces, stones, and other weight units in both directions.

Text Tools

  • Case Converter — Convert text to UPPER CASE, lower case, Title Case, camelCase, or snake_case instantly.
  • Comma Separator — Turn a list of items into a comma-separated string — or split a CSV back into a list.
  • Number to Words — Spell out any number in plain English words — useful for checks and legal documents.
  • Random Word Generator — Generate random English words for writing prompts, games, or vocabulary practice.
  • Remove Line Breaks — Remove line breaks and extra whitespace to turn multi-line text into one clean paragraph.
  • Roman Numerals Converter — Convert between Arabic numbers and Roman numerals up to 3999 instantly.
  • Text Sorter — Sort a list of words or lines alphabetically, reverse alphabetically, or randomly.
  • Word Counter — Count words, characters, sentences, and paragraphs in any text — as you type.

Image Tools

  • Favicon Generator — Generate a multi-size favicon ICO from any PNG image — all in your browser.
  • Image Compressor — Reduce image file size with a quality slider — files never leave your device.
  • Image Converter — Convert images between JPG, PNG, and WebP formats entirely in your browser.
  • Image Resizer — Resize any image to exact pixel dimensions while preserving aspect ratio.
  • Image to Base64 — Encode an image to a Base64 data URI for embedding directly in HTML or CSS.
  • Rotate & Flip Image — Rotate or flip any image 90°, 180°, or mirror it horizontally or vertically.

Home & DIY

  • BTU Calculator — Calculate the BTU capacity needed to cool or heat a room based on size, insulation, ceiling height, and sun exposure.
  • Concrete Calculator — Calculate concrete volume for slabs, footings, and columns in cubic yards or metres, plus bags needed.
  • Electricity Cost Calculator — Calculate the running cost of any appliance per hour, day, month, and year based on wattage and your electricity rate.
  • Gravel & Mulch Calculator — Calculate gravel or mulch volume, weight, and number of bags needed for any area and depth.
  • Square Footage Calculator — Calculate total floor area by adding multiple rooms or shapes in square feet or square metres.
  • Tile Calculator — Calculate the number of tiles and boxes needed for any area, including grout gaps and wastage allowance.

Utilities

  • CPS Test — Test your clicks per second with 5, 10, or 15-second timed tests and see your CPS rating.
  • Color Converter — Convert colors between HEX, RGB, and HSL formats with a live color swatch preview.
  • Keyboard Tester — Press any key to see it light up on a visual keyboard layout. Test for stuck or broken keys.
  • Microphone Test — Test your microphone with a live volume level meter. Audio is processed locally — nothing is recorded or uploaded.
  • Password Generator — Generate a strong, random password with custom length and character requirements.
  • QR Code Generator — Generate a QR code for any URL, text, or Wi-Fi network and download it as a PNG.
  • Random Number Generator — Generate one or more random numbers within any range you specify.
  • Reaction Time Test — Measure your reaction time in milliseconds with a 5-attempt test and see how you compare to average.
  • Signature Drawing Tool — Draw a custom signature on canvas with pen size and color options, then download as a transparent PNG.
  • Sri Lanka Electricity Bill Calculator — Estimate your monthly CEB electricity bill based on units consumed and current domestic tariff slabs.
  • Typing Speed Test — Measure your typing speed in WPM with 30 or 60-second tests and track your accuracy and session history.
  • Webcam Test — Test your webcam with a live preview showing resolution, FPS, and device info. Nothing is recorded or uploaded.
  • What Is My IP — Instantly display your public IP address, browser user agent, and screen resolution.
  • Wheel Spinner — Enter a list of names or options, spin the wheel, and pick a winner. Shareable via URL.

A–Z Index

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Free Online Calculators for Every Task

HandyReckon brings together over 107 free calculators across nine categories: Finance, Health & Fitness, Math & Numbers, Dates & Time, Converters, Text Tools, Image Tools, Home & DIY, and Utilities. Every tool runs entirely in your browser — no login, no tracking, no data sent to a server.

Whether you're calculating a loan payment, checking your BMI, converting units, compressing an image, or solving a maths problem, you'll find a purpose-built tool here. Each calculator includes a plain-language explanation of the underlying formula and a worked example, so you understand the result rather than just reading a number.