UD5 Toolkit
Salary Negotiation Anchor Calculator – Online First Offer Strategy
Based on your target salary, calculates a high anchor number to improve negotiation outcome. Psychological tactic.
Online Calculators - Math & More
99+ toolsCredit Card Utilization Calculator – Online Ratio & Score Effect
Enter total balance and limit to see utilization percentage. See how it affects credit score bands.
Auto Loan Calculator – Online Monthly Payment Estimator
Enter vehicle price, down payment, rate, term to compute monthly payment and total interest paid.
Rent vs Buy Breakeven Calculator – Online Simple Comparison
Compare renting to buying a home by entering price, rent, interest, and years. See which saves more. Simplified model.
Paper Towel Consumption Estimator – Online Weekly Roll Use
Track how many rolls you use per month. Input sheet count to find cost per sheet. Reduce waste.
Portable Generator Sizing – Online Wattage Estimator
Add appliances with running and starting watts to estimate needed generator capacity. Prevent overload.
Emergency Water Storage Calculator – Online Gallons per Person
Calculate how many gallons of water to store based on household size and days. Preparedness aid.
Rubber Band Ball Calculator – Online Estimate Bands Needed
Enter current ball size and target to find approx rubber bands required. Fun and satisfying.
Sore Throat Remedy Mix Calculator – Online Salt/Gargle Ratios
Calculate salt to warm water ratio for effective gargle. Also ginger and honey tea prep. Simple first aid.
Liquid Fertilizer Dilution Calculator – Online Mix Ratio
Calculate how much liquid fertilizer concentrate to add per gallon of water based on desired N concentration.
Overtime Pay Calculator – Online Time‑and‑a‑Half Estimator
Enter regular hours, hourly rate, and overtime hours to calculate total weekly pay. Follows standard 1.5x rule.
Rice Water Ratio Calculator – Online White Brown Jasmine Basmati
Select rice type and number of cups to get exact water measurement. Perfect fluffy rice every time.
Macrame Cord Length Estimator – Online Project Calculator
Calculate total cord needed for a macrame plant hanger or wall hanging based on size and knot density.
Aquarium Additive Doser – Online ml per Gallon Calculator
Enter tank volume and recommended dose to find exact ml or capfuls needed. Avoid overdosing fish.
Depth of Field Calculator – Online Near/Far Focus Limit
Input camera sensor, focal length, aperture, distance to get hyperfocal distance and DoF range. Visual chart.
Golden Hour & Blue Hour Calculator – Online Sunrise/Sunset Light
Enter a date and location (or use GPS) to see exact golden hour and blue hour times for perfect natural light.
Yarn Substitution Tool – Online Match Gauge & Yardage
When a yarn is discontinued, find equivalent alternatives by matching weight and gauge. Local reference.
Pickling Brine Calculator – Online Vinegar Water Salt Ratio
Create the perfect brine for refrigerator pickles. Adjust ratios by weight. Quick and safe recipe tool.
RV Battery Drain Calculator – Online Estimate Off‑Grid Duration
Enter appliance loads and battery capacity to estimate how long your RV can run without recharging. Local simulation.
Tiny House Cost Estimator – Online DIY Build Budget Tool
Breakdown of expected costs (materials, appliances, etc.) for a tiny house. Adjust percentages or enter custom. Local calculation.
Picture Hanging Height Calculator – Online Eye‑Level Guide
Find the ideal height to hang art based on wall and furniture dimensions. Follow gallery standard 57‑inch center rule.
Cabinet Hardware Placer – Online Even Spacing Calculator
Enter cabinet width and find optimal placement for knobs or pulls. Visual layout with grid. Achieve professional look.
Timesheet Calculator - Online Daily & Weekly Work Hours Tracker
Enter clock-in/out times for each day and see total hours worked, overtime. Calculate weekly pay based on hourly rate. Local storage.
3D Print Filament Calculator - Online Weight, Cost & Length Tool
Estimate filament usage: enter weight or length and get the remaining value plus cost. PLA/ABS density reference. Local calculation.
Coffee Ratio Calculator - Online Perfect Pour Over & French Press
Calculate coffee grounds and water needed for any brew method (SCA golden ratio). Adjust strength. Convert grams to tablespoons. Local only.
Speaker Wire Gauge Calculator - Online Length & Impedance Guide
Find the correct wire gauge for speaker cables based on length and speaker impedance to avoid signal loss. Quick audio reference. Local.
Aquarium Volume Calculator - Online Rectangular & Bow Front Tank
Calculate water volume for rectangular, bow-front, and cylindrical tanks. Also computes weight of water. Supports inches/cm. Useful for dosing treatments.
Calorie Burn by Activity - Online Walking Running Cycling Estimator
Estimate calories burned during common exercises using MET values. Input weight and duration. Compare activities. Educational, not medical advice.
Blood Alcohol Content Estimator - Online BAC Calculator
Estimate BAC based on gender, weight, drinks consumed, and time. Uses Widmark formula. Educational tool, never encourage drunk driving. Local only.
Compost Ratio Calculator – Online Brown/Green Balance Tool
Adjust material types (leaves, grass) to achieve the ideal 30:1 C:N ratio. Improve compost bin performance. Local only.
Tile Grout Calculator – Online Coverage & Spacer Guide
Calculate grout needed (lbs or kg) based on tile size, grout joint, and area. Also recommend spacer size. Local estimator.
Playdough Recipe Calculator – Online Adjust Batch Size
Scale a classic homemade playdough recipe to any amount. Choose colors with safe options. Simple local calculator.
Pet Medication Dosage Calculator - Online mg/kg Tool
Calculate liquid or tablet dosage for dogs/cats based on weight and prescribed mg/kg. Check your vet's math. Educational, always consult vet.
Insulation R-Value Calculator - Online Building Thermal Envelope Tool
Compare insulation materials and thicknesses to achieve a target R-value. Understand U-factor. Educational home improvement tool. Local.
Candle Making Calculator - Online Wax & Fragrance Oil Ratio
Calculate wax weight and fragrance oil needed for container candles. Adjust fragrance load %. Common wax types supported. Local helper.
GPA Calculator 4.0 Scale - Online Semester & Cumulative Tool
Calculate semester or cumulative GPA on a 4.0 scale. Add courses, credit hours, and letter grades. Instant calculation. No data storage.
Dew Point & Humidity Calculator - Online Celsius Fahrenheit Tool
Calculate dew point or relative humidity from temperature and the other parameter. Also computes wet-bulb temperature. Meteorology reference.
Crystal Load Capacitance Calculator - Online Pierce Oscillator Tool
Calculate load capacitors for a crystal oscillator given stray capacitance and crystal CL. Essential for microcontroller circuit design. Local.
Resistors in Parallel Calculator - Online Multiple Branch Tool
Calculate the total resistance of up to 10 resistors in parallel. Enter values and see the combined resistance instantly. Local electronics helper.
Unit Price Comparison Tool - Online Find Best Value per Ounce/Liter
Enter product size and price for two items to see true cost per unit (oz, lb, ml, etc.). Always find the better deal. Quick local math.
Currency Exchange Fee Calculator - Online Hidden Cost Revealer
Compare the real cost of currency exchange including hidden mark-ups and service fees. See how much you lose per transaction. Local educational tool.
Bird Age Converter - Online Parakeet & Cockatiel to Human
Convert popular pet bird ages (budgie, cockatiel, macaw) to human years. Lifespan reference included. Fun educational tool.
Dog Age Calculator by Breed Size - Online Human Year Equivalent
Convert dog years to human years using the updated 2019 formula that accounts for breed size (small, medium, large). More accurate than 7:1.
Disc Golf Putting Probability Calculator - Online C1X/C2 Stats
Estimate make probability of a putt based on distance and skill rating. For disc golf enthusiasts. Fun statistical tool, no data upload.
Aquarium Water Change Calculator - Online Safe Volume Replacement
Calculate how much water to change weekly to keep nitrates under control. Based on current nitrate level, desired level, and tank volume.
Hiking Pace & Time Estimator - Online Trail Plan with Elevation
Estimate hiking time using Naismith's rule (distance + elevation gain). Adjust for terrain and fitness. Plan your outdoor adventure.
Jigsaw Puzzle Glue Coverage - Online How Much to Buy
Calculate how many bottles of puzzle glue you need based on puzzle dimensions. Save a trip to the store. Simple area math.
Dice Probability Calculator - Online Sum Distribution & Odds
Calculate probability of getting a specific sum when rolling multiple dice. Visual bar chart. Useful for tabletop RPG players. Instant local computation.
Golf Handicap Calculator - Online Quick Index Estimator
Enter recent scores, course rating, and slope to estimate a golf handicap index. Simple formula for unofficial tracking. Local only.
Garden Plant Spacing Calculator - Online Grid & Row Layout
Calculate how many vegetable plants fit in a given area using square foot gardening or row spacing. Visual plant grid. Plan your spring garden.
Simple Interest Calculator - Online Principal Rate Time Tool
Compute simple interest and final amount given principal, annual rate, and duration. Also reverse-calculates rate or time. Local only.
Battery Life Calculator - Online Device Runtime Estimator
Estimate how long a battery will last given capacity (mAh/Wh) and load current. Also computes backup time for power banks. Quick and local.
Electricity Cost Estimator - Online Appliance Running Expense
Calculate daily/monthly/yearly electricity cost of any appliance based on wattage, hours used, and your kWh rate. Compare multiple devices. Fully offline.
Lumber Calculator – Online Board Feet & Material Lists
Calculate board feet for dimensional lumber and generate a cut list with waste factor. Quick carpentry tool.
Horse Feed Calculator - Online Daily Hay & Grain Ration
Estimate daily hay and grain needed for a horse based on weight and workload. Follows 2% body weight rule. Educational reference.
Window Solar Heat Gain Calculator - Online Energy Efficiency Tool
Estimate solar heat gain through windows given SHGC and orientation. Understand cooling loads. Simple educational physics tool. Local.
Drywall Sheet Calculator - Online Gypsum Board Quantity Estimator
Enter room dimensions and number of walls to calculate needed 4x8 or 4x12 sheets, plus joint compound and tape estimate. Local tool.
Plank Coverage Calculator - Online Deck Flooring & Paneling Tool
Calculate how many planks you need to cover an area given plank dimensions and gap. Quick carpentry estimator. Local only.
Pizza Dough Calculator - Online Hydration & Weight per Ball
Calculate ingredient weights for pizza dough based on number of pizzas, size, and hydration level. Includes yeast amount. Local baker's tool.
Antenna Length Calculator - Online 1/4 Wave & Dipole Tool
Calculate antenna element lengths for a given frequency (or vice versa). Supports 1/4 wave, 1/2 wave, dipole. Useful for ham radio. Local only.