All Tools
43 tools available
Construction
Gravel Calculator
Calculate cubic yards and tons of gravel needed for driveways, paths, and landscaping.
Use ToolPaint Coverage Calculator
Estimate how many gallons of paint you need for a room based on wall dimensions, openings, and number of coats.
Use ToolDrywall Estimator
Estimate drywall sheets needed for a room using wall dimensions, optional ceiling coverage, openings area, waste, and common sheet sizes.
Use ToolTile & Flooring Estimator
Estimate total flooring area, waste-adjusted coverage, and number of boxes to buy for tile, vinyl plank, laminate, or engineered flooring.
Use ToolRoofing Material Estimator
Estimate roofing squares and shingle bundles from roof footprint area, pitch multiplier, waste, and bundle coverage.
Use ToolFinance
Auto Loan Calculator
Calculate your monthly car payment and total cost, including down payment, trade-in, and sales tax.
Use ToolCompound Interest Calculator
Project the future value of savings with compound interest and optional monthly contributions.
Use ToolMortgage Calculator
Calculate your monthly mortgage payment and total interest over the life of a loan.
Use ToolRetirement Projection
Project your retirement balance based on current savings, monthly contributions, and expected return. Shows both nominal and inflation-adjusted values.
Use ToolSavings Goal Calculator
Find out how long it will take to reach a savings goal with regular contributions.
Use ToolTip Calculator
Calculate the tip on a restaurant bill and split the total across multiple people.
Use ToolUS Federal Income Tax Estimator (2025)
Estimate your 2025 US federal income tax based on gross income, filing status, and deductions. Federal only β does not include state or payroll taxes.
Use ToolContingency Fee Split Calculator
Worksheet for plaintiff-side matters: estimate attorney fee, client recovery before liens, and client net after fees, costs, and liens.
Use ToolLaw Firm Retainer Burn Estimator
Estimate how fast a legal retainer will be consumed based on hourly rate, expected monthly hours, hard costs, and a replenishment threshold.
Use ToolBillable Hours Target Planner
Turn an annual billable-hours target into monthly, weekly, and daily targets, including required working hours per day at your utilization rate.
Use ToolHealth
BMI Calculator
Calculate your Body Mass Index (BMI) and see which WHO category it falls into.
Use ToolDaily Calorie Estimator
Estimate your daily calorie needs based on the Mifflin-St Jeor equation.
Use ToolDaily Hydration Calculator
Estimate how much water you should drink each day based on your weight and activity level.
Use ToolSleep Cycle Planner
Find the ideal bedtime to wake up feeling rested by timing sleep to complete full 90-minute cycles.
Use ToolTravel
Packing List Generator
Generate a customized packing list based on your trip length, climate, and planned activities.
Use ToolTravel Entry Requirements (reference)
Get general entry-requirement guidance (passport validity, visa-waiver programs, common gotchas) for major destination regions.
Use ToolTrip Cost Estimator
Get a rough cost range for a trip based on destination region, duration, and travel style.
Use ToolConverters
Percentage Calculator
Three-in-one: "What is X% of Y?", "X is what percent of Y?", and "What is the % change from X to Y?"
Use ToolDecision Tools
Investment Style Guide
Get a suggested investment approach based on your risk tolerance and time horizon.
Use ToolGenerators
Content Outline Generator
Generate a structured content outline for articles, blog posts, and guides.
Use ToolEveryday
Date & Age Calculator
Calculate the days, weeks, months, and years between two dates. Works as an age calculator when the end date is today.
Use ToolFinal Exam Grade Needed
Figure out what score you need on your final exam to hit a target grade in the course.
Use ToolFuel Cost Calculator
Calculate the fuel cost of a trip based on distance, your vehicle's MPG, and gas price.
Use ToolGPA Calculator
Calculate your semester GPA on the standard 4.0 US scale. Enter each course's letter grade and credit hours.
Use ToolScience
Ohm's Law Solver
Given any two of voltage (V), current (A), and resistance (Ξ©), solve for the third. Also returns power (P = V Γ I).
Use Tool1D Kinematics Solver
Solve for any of initial velocity, final velocity, acceleration, time, or displacement given three of the others. Constant-acceleration equations of motion.
Use ToolCircle Solver
Given any ONE of radius, diameter, circumference, or area, compute the other three. Works in any consistent length unit (meters, feet, inches, etc.).
Use ToolFFT Analyzer
Paste a time-domain signal (comma/newline separated samples) and a sample rate. Returns the magnitude spectrum, top 5 peak frequencies, and a visual plot.
Use ToolConductor Resistance
Resistance of a length of wire/cable given its material and cross-section. Uses R = ΟΒ·L/A with resistivity looked up from the materials database.
Use ToolLED Series Resistor
Calculate the series resistor for a single LED. Given supply voltage, LED forward voltage, and desired forward current, returns the required resistance, nearest E12 standard value, and recommended power rating.
Use ToolWire Voltage Drop
Calculate voltage drop over a 2-wire conductor given current, length, cross-section, and conductor material. Resistivity is pulled from our materials database with source attribution.
Use ToolAC Power Calculator
Single-phase and three-phase AC power calculator. Solve for current, apparent power (kVA), or real power (kW) using voltage and power factor.
Use ToolTransformer Turns Ratio Solver
Given any three of primary voltage, secondary voltage, primary turns, and secondary turns, solve the fourth using the ideal transformer ratio.
Use ToolBattery Runtime Estimator
Estimate battery backup runtime from battery voltage, amp-hours, battery count, usable depth of discharge, inverter efficiency, and continuous load.
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