UD5 Toolkit
CAGR Calculator - Online Compound Annual Growth Rate
Find the CAGR of an investment given start and end values over a time period. Instant growth rate.
Tag: Calculator - Basic & Scientific
99+ toolsBayes' Theorem Calculator - Online Probability Update Tool
Easily compute posterior probabilities given prior, likelihood, and marginal likelihood. Visual diagram. All local.
Megapixel Calculator - Online Print Size & Resolution
Find out how large you can print based on image resolution in pixels. Understand DPI and megapixels.
Body Fat Percentage Calculator - Online US Navy & BMI Method
Estimate body fat percentage using the US Navy circumference method or BMI-based formula. Private and instant, all data stays on your device.
Compound Interest Calculator - Online Investment Growth Tool
Project how your savings and investments grow over time with compound interest. Interactive chart and detailed table. Free and anonymous.
Date Duration Calculator - Online Calendar & Workdays
Calculate the exact number of days, weeks, months, and workdays between two dates. Visual calendar highlights. Perfect for projects.
Sample Size Calculator - Online Survey & A/B Test Tool
Determine the minimum sample size needed for a survey or A/B test with a given confidence level and margin of error.
Golden Ratio Calculator - Online Find Balanced Proportions
Enter a number to find its golden ratio long and short segments. Use for pleasing design layouts. Instant.
F‑Stop Calculator - Online Aperture & Depth of Field Reference
Learn about f‑stops and their effect on light and depth. Calculate equivalent exposure adjustments. Educational.
Run Pace Calculator - Online Min/Mile & Min/Km Splits
Calculate your running pace per mile/km, finish time for a race, and split times. Essential for runners.
Waist‑to‑Hip Ratio Calculator - Online Body Shape Health Indicator
Measure your waist‑to‑hip ratio and learn about associated health risks. WHR interpretation. Educational only.
Pythagorean Theorem Calculator - Online Right Triangle Solver
Enter two sides of a right triangle and get the third. Also gives area and perimeter. Simple and visual.
Sales Tax Calculator - Online U.S. State Tax Estimator
Estimate the total price after adding US state sales tax. Select state, enter amount, and see breakdown. Simple and quick, perfect for shoppers.
Mortgage Calculator - Online Home Loan & Amortization Tool
Estimate monthly mortgage payments with amortization schedule. Input loan amount, interest rate, and term. All calculations performed securely on your device.
Percentage Calculator - Online Find Percent, Increase & Decrease
Perform common percentage calculations: find percent of a number, percentage increase/decrease, and more. Simple, fast, and always available for free.
Subscription Rename & Cost Calculator - Online Saver
Track your subscriptions, calculate monthly and yearly totals, and find savings by pausing unused services. Local data.
Confidence Interval Calculator - Online Mean & Proportion
Compute confidence intervals for a population mean (known/unknown sigma) and proportion. All popular Z/T values. Local.
Aspect Ratio Calculator - Online 16:9 4:3 & Custom
Calculate new dimensions while preserving aspect ratio, or find the ratio from width and height. For video and images.
Polygon Centroid Calculator - Online Center of Mass
Find the centroid (center of mass) of any convex polygon by entering vertex coordinates. Useful for physics and design.
Molar Mass Calculator - Online Molecular Weight Tool
Enter a chemical formula (e.g., H2O, C6H12O6) and calculate its molar mass. Handles parentheses and hydrates. Pure frontend.
Car Loan Calculator - Online Auto Financing & EMI Tool
Estimate monthly car loan payments with trade-in, down payment, and sales tax options. Amortization schedule included. Client-side calculation.
Binary Calculator - Online Add Subtract Multiply Binary Numbers
Calculate with binary numbers: addition, subtraction, multiplication, and division. Also bitwise AND, OR, XOR. Programmer's tool, fully client-side.
BMI Calculator - Online Body Mass Index Tool
Check your Body Mass Index using standard or metric units. Get a health category analysis instantly. Educational purpose only; data stays private.
Bubble Tea Recipe Calculator - Online DIY Boba Proportions
Choose your cup size and sweetness level, and get exact proportions for tea, milk, syrup, and tapioca pearls. Perfect homemade boba every time.
Wind Chill & Heat Index Calculator - Online Feels Like
Enter temperature and wind speed (or humidity) to get the 'feels like' temperature. Safety guidelines included.
Transistor Biasing Calculator - Online Fixed & Voltage Divider
Calculate resistor values for transistor fixed bias or voltage divider configuration. Quick quiescent point analysis.
Battery Series/Parallel Calculator - Online Voltage & Capacity
Combine multiple identical batteries in series and parallel and see the resulting voltage and total capacity. Electronics helper.
Day of the Week Calculator - Online Find Weekday from Date
Find what day of the week any past or future date falls on. Uses Zeller’s congruence. Fun historical reference tool.
Retirement Calculator - Online Savings & Investment Planner
Project your retirement savings growth with monthly contributions, employer match, and CAGR. Interactive chart. Financial data stays on your device.
Macronutrient Calculator - Online Protein Carb Fat Split
Determine your ideal daily macronutrient intake based on TDEE, goal, and diet preference. Free nutrition planning tool with local computation.
Fraction Calculator - Online Add Subtract Multiply Divide
Perform arithmetic on fractions and get simplified results. Handles mixed numbers and improper fractions. Step-by-step display. Educational and precise.
Tip Pool Calculator - Online Fair Share Splitter for Staff
Fairly distribute pooled tips among staff based on hours worked or points. Customizable percentages. All calculations local and private.
Unix Permissions Calculator - Online chmod Visual Editor
Check read/write/execute boxes and see the octal and symbolic chmod representation. Learn and compute file permissions.
Moon Age Calculator - Online Days Since New Moon
Calculate the age of the moon in days since the last new moon. See illumination percentage. Simple algorithm.
Timezone Difference Calculator - Online Meeting Planner Two Cities
Pick two cities, set a date, and instantly see the time difference. Plan the perfect meeting time across time zones.
Gamma Function Calculator - Online Advanced Factorial
Evaluate the Gamma function for real and complex inputs (real part). Extension of factorial. Academic mathematics tool.
Hypergeometric Distribution Calculator - Online Sampler Probability
Calculate probability of k successes when sampling without replacement. Useful for quality control and card games.
Bernoulli Trial Calculator - Online Binomial Probability
Calculate the probability of exactly k successes in n independent Bernoulli trials. Step-by-step result. Local.
Split Payment Calculator - Online Divide Bill with Fees & Tax
Divide a total bill among multiple people considering tax and service fees. See exactly who pays what.
Bike Gear Inch & Ratio Calculator - Online Cycling Tool
Calculate gear inches, meters of development, and speed ratio for any chainring/cog combination. For cyclists.
Distance Between Two Points - Online 2D & 3D Calculator
Compute the Euclidean distance between two points in 2D or 3D space. Also shows midpoint. Quick geometry helper.
Love Calculator - Online Fun Romance Compatibility Test
Enter two names and get a playful love compatibility percentage. Purely for entertainment! All calculation happens instantly in your browser.
Hourly Pay Calculator - Online Wage & Overtime Estimator
Calculate your weekly, monthly, or annual pay based on hourly wage and hours. Include overtime rates. Accurate and private.
Day of Year Calculator - Online Ordinal Date
Find out what day number of the year any date is (1‑366). Also shows days remaining. Simple reference.
Unix Timestamp Difference Calculator - Online Durations
Enter two Unix timestamps and get the exact difference in days, hours, minutes, and seconds. Quick time debugging.
Solar Noon Calculator - Online When Is Sun Highest
Enter a location and date to find the exact time of solar noon, sunrise, and sunset. Astronomy tool.
Bandwidth & Download Time Calculator - Online
Estimate how long it takes to download/upload a file given bandwidth speed. Also convert between bits and bytes.
Stock Average Down Calculator - Online Investment Cost Basis
Calculate the new average cost of a stock after buying more shares at a different price. Invest smarter. All local.
Road Trip ETA Calculator - Online Arrival Time with Stops
Estimate arrival time with driving duration, breaks, and time zone changes. Plan your road trip precisely.
Discount Calculator - Online Sale Price & Savings Tool
Quickly find the final price after a percentage discount. Also works in reverse to find the original price. Handy for budget shoppers.
Shoelace Length Calculator – Online Eyelet Pairs & Pattern
Enter number of eyelet pairs and lacing style to find the correct shoelace length in inches/cm. Never buy too short.
Visual CSS Specificity Calculator - Online (0,0,1) Style
Enter a CSS selector and see its specificity broken down into A,B,C columns with a visual weight comparison. Learn specificity.
Markup Percentage Calculator - Online Price & Margin
Compute the selling price from cost and desired markup percentage, or find the markup from cost and price.
Break‑Even Point Calculator - Online Units & Sales
Calculate the break‑even point in units and dollars. Input fixed costs, variable cost per unit, and price.
IPv4 Subnet Builder - Online Visual Range Calculator
Enter an IP and CIDR prefix to visually see network address, broadcast, usable range, and subnet mask conversions.
Error Function (erf) Calculator - Online Statistics & Physics
Compute the error function and complementary error function for any real x. Quick and precise. Pure frontend math.
Electricity Cost Calculator - Online Appliance Running Expense
Enter wattage, hours per day, and your electricity rate to calculate daily, monthly, and annual cost. Save energy.
Rule of 72 Calculator - Online Estimate Investment Doubling
See how many years it takes to double your money at a given interest rate using the Rule of 72. Quick financial math.
Hue Rotation Calculator - Online Shift CSS Filter Value
Enter original and target color to compute the exact CSS hue‑rotate(deg) filter needed. For precise icon and image tinting.
Nernst Equation Calculator - Online Electrochemical Potential
Calculate half-cell and full cell potentials under non-standard conditions. Enter concentrations and temperature. Local.