UD5 Toolkit
DIY Electrolyte Powder Calculator – Online Sodium Potassium Glucose Ratio
Create your own oral rehydration solution by mixing salt, potassium, and sugar to WHO formula. Convert to teaspoon amounts.
Tag: Calculator - Basic & Scientific
99+ toolsShoelace 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.
Jerky Marinade Ratio Calculator – Online Soy, Worcestershire, Cure
Scale a jerky marinade recipe based on meat weight. Includes optional cure #1 calculation for safety.
Safe Room Size Calculator – Online Occupancy & Ventilation Check
Enter number of people and desired duration to estimate the minimum square footage and ventilation CFM for a residential storm shelter.
Freelance Day Rate Calculator – Online Project Cost Estimator
Based on desired annual income and billable days, calculate your minimum day rate. Don't undercharge.
Moving Truck Size Calculator – Online Bedrooms to Cubic Feet
Enter number of bedrooms and large items to estimate the truck size you need. Avoid multiple trips. Simple local estimator.
Road Trip Playlist Time Calculator – Online Music for Miles
Enter total drive time or playlist length to figure out how many songs you need. Convert time to estimated tracks.
Crochet Hat Sizing Guide – Online Measure & Increase
Enter head circumference to get crown diameter and length. Perfect fit top‑down hats.
Water Leak Cost Calculator – Online Drip to Gallon Waste
Select drip speed or running toilet and see gallons wasted per day and annual cost. Fix leaks!
Screen Time Reward Calculator – Online Chores = Minutes
Enter completed chores/reading minutes to calculate earned screen time. Customizable rates. Local tracking.
Viewport Unit Calculator – Online vw vh vmin vmax to PX
Enter a CSS value in vw/vh and see the actual pixel size at current viewport. Dynamic resize demo.
Salary Negotiation Anchor Calculator – Online First Offer Strategy
Based on your target salary, calculates a high anchor number to improve negotiation outcome. Psychological tactic.
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.
Toilet Paper Stock Calculator – Online How Long Will It Last?
Enter rolls remaining and household size to estimate weeks of supply. A humorous yet practical aid.
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.
Popcorn Yield Calculator – Online Kernels to Popped Volume
Enter amount of kernels and see estimated popped volume. Plan movie night snacks perfectly.
Rubber Band Ball Calculator – Online Estimate Bands Needed
Enter current ball size and target to find approx rubber bands required. Fun and satisfying.
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.
Pom‑Pom Yarn Calculator – Online How Many Wraps for Size
Enter desired pom-pom diameter to estimate yards needed and number of wraps. Quick craft math.
Aquarium Additive Doser – Online ml per Gallon Calculator
Enter tank volume and recommended dose to find exact ml or capfuls needed. Avoid overdosing fish.
Liquid Fertilizer Dilution Calculator – Online Mix Ratio
Calculate how much liquid fertilizer concentrate to add per gallon of water based on desired N concentration.
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.
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.
Child Support Estimator – Online Simple State Guideline Calculator
Approximate monthly child support obligation based on both parents incomes and number of children. Uses simplified model for educational reference. Not legal advice.
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.
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.
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.
Flooring Layout Planner – Online Stagger Pattern & Waste Calc
Visualize random-width plank layout and calculate total square footage plus waste for hardwood or laminate flooring.
Roof Pitch Calculator – Online Rise, Run & Angle Finder
Enter any two of rise, run, pitch ratio, or angle to get the others. Useful for DIY shed or home projects.
Concrete Volume Calculator – Online Slab, Footing, Column
Calculate cubic yards or meters for various shapes (rectangular slab, circular column, trapezoidal footing). Local math tool.
Lumber Calculator – Online Board Feet & Material Lists
Calculate board feet for dimensional lumber and generate a cut list with waste factor. Quick carpentry tool.
Playdough Recipe Calculator – Online Adjust Batch Size
Scale a classic homemade playdough recipe to any amount. Choose colors with safe options. Simple local calculator.
Party Headcount & Supply Calculator – Online Estimate for Kids
Enter number of children and see estimated cups, plates, party favors needed. Quick planning tool for birthday parties.
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.
Poker Hand Odds Calculator - Online Texas Hold'em Win Probability
Enter your hole cards and the community cards to see probability of winning, drawing, etc. Simple simulation in browser. Educational, not gambling.
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.
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.
Firewood Cord Calculator - Online Stack Volume & Btu Estimator
Enter log pile dimensions to calculate cords and face cords. Also estimate heat content in BTUs by wood species. Local reference.
Airflow CFM Calculator - Online HVAC Duct Sizing Tool
Calculate airflow in cubic feet per minute given velocity and duct diameter. Simple HVAC reference. Local only.
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.
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.
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.
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.
Epoxy Resin Mix Calculator - Online Part A & B by Volume/Weight
Calculate how much resin part A and part B to measure for a given total volume. Common ratios (2:1, 1:1). Avoid sticky failures. 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.
Final Exam Grade Calculator - Online What You Need to Score
Determine what score you need on your final exam to achieve your target overall grade. Enter current grade, weight, desired grade. Local only.
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.
Percent Error & Relative Error Calculator - Online Lab Report Tool
Calculate absolute error, relative error, and percent error between experimental and theoretical values. For science students. Instant local math.
Canning Altitude Adjuster - Online Boiling Water Processing Time
Enter your altitude to adjust canning processing times or pressure. Prevent botulism. Based on USDA guidelines. Essential for home canners.
Sourdough Hydration Calculator - Online Bread Baker's Tool
Calculate flour, water, starter amounts to achieve a target loaf hydration. Adjusts for starter hydration. Instant local calculation.
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.
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.
Tree Carbon Sequestration Calculator - Online Environmental Tool
Estimate how much CO2 a tree captures over its lifetime based on species, age, and climate. Learn about your green impact. Educational local tool.
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.