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Finance
(56)
Home & DIY
(27)
Health
(16)
Productivity
(26)
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(21)
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146 shown
Mortgage Calculator
Monthly principal & interest, total interest, and how down payment, rate, and term affect costs.
loan
mortgage
house
payment
☆
Compound Interest
Growth with optional monthly contributions.
invest
growth
savings
☆
Time to $1M
Years to reach a million with contributions and growth.
million
goal
invest
☆
FIRE Number
How much you need to retire early.
retire
fire
savings
☆
Student Loan Payoff
Payoff timeline and interest saved with extra payments.
loan
student
debt
☆
Auto Loan Calculator
Monthly car payment, interest, taxes, fees, and trade-in.
car
loan
auto
☆
Credit Card Payoff
Months to payoff and interest saved with extra payments.
debt
credit
payoff
☆
Rent vs Buy
Compare long-term costs of renting versus owning a home.
rent
buy
house
☆
Emergency Fund & Runway
How long your savings will last and what target to aim for.
savings
emergency
runway
☆
Break-even Analysis
Units and revenue needed to cover your costs.
business
profit
costs
☆
Home Affordability
Estimate the home price you can realistically afford.
house
afford
mortgage
☆
Inflation Calculator
Purchasing power over time and future equivalents.
money
future
value
☆
TDEE & Macro Calculator
BMR, maintenance calories, and protein/fat/carb targets for cutting, bulking, or maintaining.
fitness
diet
macros
☆
True Hourly Wage Calculator
Real take-home hourly rate after taxes, commute, unpaid breaks, and work expenses.
job
wage
money
☆
Debt Snowball vs Avalanche
Compare payoff order, timeline, and interest saved across multiple debts with extra payments.
debt
payoff
strategy
☆
Refinance Break-Even
Mortgage refi calculator: new payment, monthly savings, break-even months, and total interest difference.
mortgage
refi
loan
☆
Budget Planner
50/30/20 and custom budget. Income, categories, breakdown, remaining, and suggestions.
budget
money
spend
☆
401k & Retirement Growth
Project 401(k) balance with contributions, employer match, raises, and expected returns.
retire
401k
invest
☆
Paycheck Take-Home Estimator
Rough US paycheck estimator: federal, FICA, simple state, pre-tax deductions, and net pay.
pay
tax
salary
☆
Safe Withdrawal Rate (FIRE)
Monte Carlo and deterministic projections for safe withdrawal rates and sequence risk.
fire
retire
withdraw
☆
Roth vs Traditional IRA
Compare after-tax retirement balances for Roth vs Traditional IRA contributions.
retire
tax
ira
☆
HSA Contribution Optimizer
Compare the powerful tax advantages of an HSA versus a taxable brokerage account.
health
tax
savings
☆
BMI & Body Fat Calculator
Calculate BMI and US Navy body fat percentage from height, weight, neck, waist, and hip. See health categories.
fitness
body
health
☆
Running Pace Calculator
Convert distance and time to pace. Predict race times with Riegel formula and view training zones.
run
pace
training
☆
One Rep Max Calculator
Estimate your 1RM for lifts using Epley, Brzycki, Lombardi, McGlothin, and other validated formulas.
lift
strength
gym
☆
Sleep Cycle Calculator
Calculate optimal bedtimes from your wake time using 90-minute sleep cycles (4–8 cycles).
sleep
bedtime
recovery
☆
Meeting Cost Calculator
Real-time cost of meetings from attendees, hourly rates or salaries, and duration. Discover what it could buy instead.
work
time
cost
☆
Advanced Percentage Calculator
Reverse percentages, percentage change over periods, successive changes, and percentage-of-a-percentage.
math
percent
calc
☆
Unit Converter
Instant conversions for length, area, volume, weight/mass, temperature, cooking, and digital data.
convert
units
measure
☆
Paint Calculator
Gallons and cost for walls, ceilings, and openings.
paint
walls
diy
☆
Roofing Calculator
Pitch-adjusted area, bundles, waste, and shingle cost.
roof
shingles
diy
☆
Concrete Calculator
Volume, bags, and cost for slabs, footings, and columns.
concrete
pour
diy
☆
Flooring Calculator
Area, boxes, waste, and material cost for floors and tile.
floor
tile
diy
☆
Mulch & Gravel Calculator
Volume, bags, and cost for mulch, gravel, and similar materials.
yard
mulch
gravel
☆
Fuel Cost Calculator
Trip fuel, tolls, and cost per mile or per person.
car
fuel
trip
☆
Deck Materials Calculator
Boards, joists, posts, railing, stairs, and total cost for wood or composite decks.
deck
wood
diy
☆
Drywall Calculator
Sheets, joint compound, tape, screws, and cost for walls and ceilings with waste.
drywall
walls
diy
☆
Fence Calculator
Posts, panels or pickets, gates, rails, concrete, and total cost from linear feet.
fence
yard
diy
☆
Stair Stringer Calculator
Risers, treads, stringer length, cut list, and material for wood stairs and decks.
stairs
deck
diy
☆
Insulation Calculator
Bags, rolls or sheets for batt, blown, or rigid insulation at target R-value.
insulation
home
diy
☆
Cabinet & Countertop Calculator
Area or linear feet, material type, sink cutouts, waste, and countertop cost.
kitchen
counter
diy
☆
Siding Calculator
Wall area, panels/planks, waste, and trim (corners, J-channel, starter) with cost.
siding
exterior
diy
☆
2048
Slide tiles and merge numbers to reach 2048. Keyboard, swipe, undo, and local high scores.
puzzle
numbers
2048
☆
Minesweeper
Classic mine-clearing. Multiple difficulties, first-click safe, flags, timer, and best times.
classic
puzzle
mines
☆
Memory Match
Flip and match pairs. 4×4 or 6×6 grids with numbers, symbols, or emojis. Track best moves and time.
memory
match
kids
☆
Sudoku
9×9 Sudoku with Easy/Medium/Hard. Pencil marks, hints, solve check, timer, and local best times.
puzzle
numbers
logic
☆
Connect Four
6×7 Connect Four vs reasonable AI or local 2-player. Win detection and keyboard controls.
board
strategy
2player
☆
Hangman
Word guessing with General, Finance, and Home lists. Difficulties, stats, and local streaks.
word
guess
classic
☆
Lights Out
Toggle lights puzzle (self + neighbors). 3×3 to 6×6 boards, solver hints, and local best moves.
puzzle
lights
logic
☆
Simon
Classic color sequence memory. Growing levels, keyboard/tap, and local best scores.
memory
classic
simon
☆
Tetris Lite
Simple Tetris with left/right/rotate/down/hard drop. Score, lines, next piece, and local high score.
classic
blocks
tetris
☆
Tip & Split
Calculate tip and split a bill by number of people with custom percentage.
productivity
☆
Overtime Pay Calculator
Calculate regular pay, overtime at 1.5x, double time, and total earnings from hours worked.
productivity
☆
Pomodoro Timer
25/5 focus timer with customizable work, short break, long break cycles. Auto-advance, pause, reset, and session counter. Runs locally with excellent defaults.
focus
timer
productivity
☆
Password Generator
Generate strong random passwords with length, numbers, symbols, and easy copy. All client-side.
productivity
☆
Reaction Time Test
Measure your reaction time. Click when the box turns green. Multiple tries, average, best.
games
☆
Click Speed
Measure how many clicks per second you can land in a fast 10-second target challenge.
games
☆
Sales Tax Calculator
Calculate sales tax and totals with multiple rates, discounts, and shipping. Compare tax-inclusive vs exclusive instantly.
finance
☆
Commission Calculator
Calculate earnings from flat rate, tiered, or quota-based sales commissions. Includes draw recovery and splits.
finance
☆
Higher or Lower
Guess whether the next card will be higher or lower and build the longest streak you can.
games
☆
Unit Price Comparator
Compare prices across different package sizes. See true cost per ounce, per count, per liter, and find the best value instantly.
productivity
☆
Rock Paper Scissors
Play fast best-of-five rock paper scissors against the computer with streaks and local stats.
games
☆
Invoice & Quote Totaler
Add line items with quantity and price. Apply discounts, tax, and shipping. Live totals and professional summary for quick invoices or quotes.
productivity
☆
Fuel Efficiency & Cost
Convert MPG ↔ L/100 km. Estimate trip fuel use and cost at your local price. Includes round-trip and passengers.
productivity
☆
Whack-a-Mole
Hit the popping mole before it moves in a quick 30-second arcade reflex game.
games
☆
Salary & Hourly Converter
Convert between annual salary and hourly rate for any pay schedule: weekly, bi-weekly, semi-monthly, monthly. Live and precise.
productivity
☆
Target Heart Rate Zones
Calculate fat-burn, cardio, and peak heart rate training zones from age and resting heart rate.
health
☆
Daily Water Intake
Estimate your daily hydration target from weight, activity level, and environment.
health
☆
Board Feet & Lumber Cost
Convert length × width × thickness to board feet and estimate total cost including waste for lumber projects.
home
☆
Tic Tac Toe
Play classic 3×3 against a smart computer. Keyboard, undo, instant win detection, and streak tracking.
games
☆
Reading Time Estimator
Paste text or enter word count. See minutes to read at different speeds plus speak time.
productivity
☆
Savings Goal Date
Find the month and year you hit your savings target given monthly contributions and expected return.
finance
☆
15 Puzzle
Classic sliding tile puzzle. Solve the 4×4 grid in fewest moves. Tap/keyboard arrows, shuffle, timer and move counter.
games
☆
Wallpaper Calculator
Estimate rolls of wallpaper needed for a room with pattern repeat and waste.
home
☆
Barbell Plate Calculator
See exact plates per side to load a target total weight on a standard bar.
health
☆
Dividend Yield & Income
Compute yield percent and yearly dividend cash from shares owned and price.
finance
☆
Base64 Encode / Decode
Instant Base64 and URL-safe encode/decode with copy. Great for tokens, data URLs, quick debugging.
productivity
☆
Color Contrast Checker
Enter hex colors and instantly see contrast ratio, WCAG AA/AAA pass/fail for text and UI.
productivity
☆
Electricity Cost Estimator
Calculate kWh and monthly cost from wattage, hours used, and your rate. Multiple appliances.
home
☆
Age Calculator
Enter birthdate to see precise current age and days until next birthday.
productivity
☆
Stopwatch with Laps
Start/pause/reset with spacebar. Record laps, see splits and totals. Copy results.
productivity
☆
GPA Calculator
Add classes with credits and grades. See live GPA, total credits, and what-if scenarios.
productivity
☆
Snake
Classic snake. Eat apples, grow, don't crash into walls or yourself. Arrow keys + swipe, pause, local high score.
games
☆
Rule of 72
Estimate years to double your money (or rate needed to double in X years). Classic quick finance rule.
finance
☆
Waist-to-Hip Ratio
Measure central obesity risk. Enter waist and hip, see ratio and health category by gender.
health
☆
Blackjack Lite
Play simple blackjack vs dealer. Hit/stand, natural blackjack, bust, local streak stats. Keyboard friendly.
games
☆
Caffeine Level Tracker
Enter intake and time. See current level, time to sleep-safe, and decay curve. Multiple doses.
health
☆
List Shuffler & Picker
Paste a list, shuffle, pick N random items, or sort. Live, copy results. Great for teams, giveaways, decisions.
productivity
☆
Sleep Debt Calculator
Track missed sleep over days. See total debt, recommended catch-up, and bedtime to recover.
health
☆
Dice Roller
Roll any number of dice with any sides. History, sum, reroll, presets for D4/D6/D8/D10/D12/D20.
games
☆
Body Surface Area
Estimate BSA in m² using common medical formulas (Mosteller, DuBois, Haycock). Live results for dosing/calculations.
health
☆
529 College Savings Planner
Project college savings with monthly contributions, expected return, and tax-free growth.
finance
☆
Car Lease vs Buy
Compare total cost of leasing vs buying a car with down payment, terms, and residual.
finance
☆
Home Equity Loan vs HELOC
Compare fixed-rate home equity loan vs variable HELOC payments and total interest.
finance
☆
Credit Score Simulator
Rough simulator: see how utilization, late payments, and new credit affect score ranges.
finance
☆
Side Hustle Tax Estimator
Estimate self-employment tax + income tax on gig income after standard deductions.
finance
☆
Dividend Reinvestment Planner
See growth with vs without reinvesting dividends over years.
finance
☆
Capital Gains Tax Calculator
Estimate long-term capital gains tax on stock sale with income bracket.
finance
☆
Bond Yield to Maturity
Calculate YTM given price, coupon, face value, and years to maturity.
finance
☆
Options Breakeven Calculator
Compute breakeven prices for long/short calls and puts.
finance
☆
Lawn Fertilizer Calculator
Calculate bags needed for area and N-P-K rate.
home
☆
Garden Planting Spacing
Calculate plants per row and total for a bed given spacing.
home
☆
Window Replacement ROI
Estimate energy savings vs cost of new windows.
home
☆
Solar Payback Calculator
Estimate years to payback for solar install given production and incentives.
home
☆
HVAC Sizing Estimator
Rough BTU or ton estimate from square footage and climate.
home
☆
Gutter & Downspout Capacity
See if your gutters can handle rainfall for roof area.
home
☆
Septic Tank Pump Schedule
Recommend pumping frequency based on tank size and household.
home
☆
Well Water Usage Estimator
Daily/annual water use estimate for household + irrigation.
home
☆
Pool Chemical Doser
Calculate chlorine or other chemical amounts for pool volume.
home
☆
Furniture Layout Planner
Simple room grid planner: place rectangles and see if they fit.
home
☆
Closet Capacity Planner
Estimate hanging space, shelves, and drawers you can fit.
home
☆
VO2 Max Estimator
Estimate from resting HR, age, and activity level (or Cooper test).
health
☆
Ideal Weight Calculator
Multiple formulas (Hamwi, Devine, Miller, Robinson).
health
☆
Pregnancy Due Date + Milestones
Calculate due date from LMP and show trimester milestones.
health
☆
Medication Half-Life Tracker
Estimate time for drug to reduce to certain level.
health
☆
Sunburn Time Estimator
Rough time to burn based on UV index and skin type.
health
☆
Meeting Agenda Timer
Run a timed agenda with sections and alerts.
productivity
☆
Decision Matrix Maker
Score options against weighted criteria.
productivity
☆
Trip Packing List Generator
Generate and check off a packing list by trip type.
productivity
☆
Recipe Scaler
Scale ingredient quantities for different servings.
productivity
☆
Wordle Solver Helper
Enter known letters/positions and get possible words (small list).
games
☆
Yahtzee Scorecard
Fill a Yahtzee scorecard and calculate upper/lower bonuses.
games
☆
QR Code Generator
Generate QR codes for text/URLs (client-side).
productivity
☆
JSON Formatter & Validator
Pretty print and validate JSON.
productivity
☆
IP Subnet Calculator
Calculate network, broadcast, hosts for CIDR.
productivity
☆
Regex Tester
Test regex against sample text with matches.
productivity
☆
Mortgage Extra Payment Calculator
See how extra monthly or one-time mortgage payments shorten payoff time and reduce interest.
finance
☆
Mortgage Biweekly Payment Calculator
Compare monthly mortgage payments with biweekly payments and the interest savings from one extra payment per year.
finance
☆
Mortgage Points Break-Even Calculator
Find when buying mortgage discount points pays back through lower monthly payments.
finance
☆
ARM vs Fixed Mortgage Calculator
Compare a fixed-rate mortgage with an adjustable-rate mortgage intro period and reset payment.
finance
☆
Mortgage Amortization Schedule
See yearly principal, interest, and remaining balance for a fixed-rate mortgage.
finance
☆
Mortgage Payoff Date Calculator
Estimate the date your mortgage will be paid off from balance, rate, and payment.
finance
☆
PMI Removal Calculator
Estimate when your loan-to-value reaches the threshold where PMI can usually be removed.
finance
☆
PMI Cost Calculator
Estimate monthly private mortgage insurance and its impact on your housing payment.
finance
☆
FHA Loan Payment Calculator
Estimate FHA payment including upfront MIP, monthly MIP, taxes, and insurance.
finance
☆
VA Loan Payment Calculator
Estimate VA loan payment including funding fee, taxes, insurance, and no monthly PMI.
finance
☆
Buyer Closing Costs Calculator
Estimate cash needed to close from down payment, lender fees, title costs, prepaids, and credits.
finance
☆
Seller Net Sheet Calculator
Estimate home sale proceeds after payoff, commissions, closing costs, concessions, and liens.
finance
☆
Debt-to-Income Ratio Calculator
Calculate front-end and back-end DTI from income, housing payment, and monthly debts.
finance
☆
Loan-to-Value Calculator
Calculate mortgage LTV, combined LTV, equity, and equity percentage.
finance
☆
Cash-Out Refinance Calculator
Estimate cash out, new loan-to-value, new payment, and refinance cost impact.
finance
☆
Mortgage Recast Calculator
Estimate lower monthly payment after a lump-sum mortgage recast.
finance
☆
2-1 Buydown Calculator
Calculate temporary first-year and second-year mortgage payment savings from a 2-1 buydown.
finance
☆
HELOC Payment Calculator
Estimate interest-only and amortizing HELOC payments from balance, rate, and repayment term.
finance
☆
Refinance vs Extra Payment Calculator
Compare refinancing with keeping your mortgage and paying extra principal each month.
finance
☆
APR vs Interest Rate Calculator
Estimate APR-style borrowing cost from interest rate, loan term, and lender fees.
finance
☆
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