Calculators

214 projects, page 1 of 4

• Room Split — Split Airbnb Costs Fairly by Room Quality

  A fairness calculator for group rentals. Enter rooms, quality, and nights — get a weight-adjusted per-person cost with a transparent formula to forward to the group chat.

  Calculators · Everyday life

• Cash Stack — What Does Money Look Like?

  Convert any cash amount into physical weight, stacking height, volume, and everyday-container equivalents across 8 currencies. Instantly visualize massive cash figures.

  Calculators · Money & crypto

• Is That Enough? — Viral Budget Reality Check

  Enter a viral budget claim and your actual monthly expenses to instantly get a coverage percentage and category gap breakdown. Settle the internet argument with a screenshot-ready verdict in 30 seconds.

  Calculators · Money & crypto

• Cash Cushion — See When Your Cash Runs Dry, Category by Category

  Enter your real monthly expenses and how many days of disruption you want to cover. Cash Cushion calculates the exact cash total and draws a day-by-day timeline so your weakest expense link is visible at a glance.

  Calculators · Everyday life

• Water Ready — Emergency Water Calculator

  Know exactly how much water your family needs for any outage without guessing. Get a printable water budget with breakdown by drinking, cooking, and hygiene.

  Calculators · Safety & emergencies

• Move Math — Break-Even Calculator for Apartment Switching

  See the exact month a cheaper apartment actually pays off. Enter your rent, deposit, and all hidden moving costs to get your break-even month.

  Calculators · Science & space

• Payment Sense — See the Real Price Behind Monthly Payments

  A daily 10-round mental-math game that trains you to instantly estimate the true total cost behind

  Calculators · Money & crypto

• Wait or Buy Calculator — See the Exact Day Patience Stops Paying Off

  An interactive break-even calculator for purchase-timing decisions. Enter price, waiting cost, expected price change, and confidence to get a concrete break-even day and dollar figure. Fully localized.

  Calculators · Money & crypto

• 🎒 Backpack Weight Calculator for Kids — Check & Fix

  Enter your child

  Calculators · Everyday life

• Real Price — What 0% Interest Really Costs | Installment vs Cash Calculator

  Free calculator that reveals the hidden markup between a cash price and an installment total, then compares paying now versus saving the same monthly amount and buying later. Enter two numbers from any payment-plan ad.

  Calculators · Money & crypto

• Fuel Switch — Gas vs EV Break-Even Calculator | Find Your Flip-Point

  Enter three numbers from your gas receipt to find the exact price per gallon where switching to an EV pays off. Auto-filled EIA & EPA data you can verify. Drag the slider to find your flip-point.

  Calculators · Travel & transport

• Trial Trap — Free Trial Cost Calculator & Countdown

  See the real cost of every free trial before you sign up. Calculate exact charge date, 1/3/6-month cumulative cost, and cancel-by date. Save trials locally with live countdowns.

  Calculators · Everyday life

• Loss Math — How Much Gain to Recover a Loss?

  A timed 10-round solo game to train your gut instinct for the asymmetric math of investment recovery. See a loss, guess the gain needed to break even.

  Calculators · Science & space

• Delay Decide — Should You Wait, Go Home, or Get a Hotel?

  A delay decision calculator for stressed travelers. Enter your delay estimate, travel time, hotel cost, and rebooking risk to get one clear recommendation plus a transparent break-even table.

  Calculators · Travel & transport

• Worth It — Cost-Per-Use Calculator

  Get a stamped verdict on any premium purchase in 15 seconds. Compare a premium item against cheaper replacements. No spreadsheet, no guessing.

  Calculators · Everyday life

• Your Money, Their Rules | CBDC Personal Impact Calculator

  See what programmable money restrictions would do to YOUR spending in 30 seconds. Map documented CBDC capabilities onto your monthly budget and get a spending-freedom score.

  Calculators · Money & crypto

• Sunk or Stop — Sunk Cost Fallacy Calculator

  A sunk cost fallacy calculator that takes your real numbers and shows the one comparison that matters: what it still costs to finish versus what you

  Calculators · Everyday life

• Money Melt — See How Much Your Savings Are Melting Today

  An inflation calculator that shows your daily purchasing-power loss and a countdown to when your savings halve. Know the personal impact today, not in ten years.

  Calculators · Money & crypto

• Fee Map — See Every Budget Airline Fee on One Screen

  Free reference for budget airline fees. See carry-on, checked bags, seat selection, and payment fees for Ryanair, Wizz Air, easyJet, and more on one screen with source links and verification dates.

  Calculators · Money & crypto

• Room Split — Split Hotel Rooms Fairly | Free Tool

  Free tool to split group hotel costs when rooms have different prices and people stay different nights. Get fair per-person totals with who-owes-whom arrows. Share a link in the group chat. No account, no server.

  Calculators · Travel & transport

• Budget Squeeze — Survive Price Shocks in 30 Seconds

  A daily 3-minute solo game: a price shock hits your budget, you have 30 seconds to rebalance 6 categories, and shocks escalate every round. Same seed for everyone each day.

  Calculators · Money & crypto

• Rent Crossover — Rent vs Buy Breakeven Calculator

  Enter monthly rent and purchase price to instantly see the exact month buying becomes cheaper than renting. Drag assumptions live, share the result.

  Calculators · Money & crypto

• Sub Cut — Find which subscriptions to cancel in 60 seconds

  Sub Cut is a zero-friction subscription audit tool. Enter your subscription names, monthly costs, and how often you actually use each one — it ranks them by cost-per-use, shows your total annual spend, and tells you exactly which bottom three to cut and how much you

  Calculators · Words & language

• KidBill — Test Any Child Cost Claim Against Your City

  A free, no-signup calculator that checks whether a public budget claim holds up against your city and lifestyle. Get a sourced 18-year cost breakdown and a clear verdict.

  Calculators · Money & crypto

• Fix or Toss: Repair or Replace Calculator

  Know whether to fix or replace any broken item in 15 seconds without the guesswork. Enter four numbers and get a clear FIX, TOSS, or BORDERLINE verdict based on breakeven months and survival probability.

  Calculators · Safety & emergencies

• True Cost — Train Your Brain to Spot Real Prices

  A daily 5-round game that trains your reflex for converting deceptive unit pricing (per gram, per 100ml) into real totals. Build calibrated intuition so you never get bill shock again.

  Calculators · Travel & transport

• 💵 Cash Stash | Emergency Cash Reserve & Bill Mix Calculator

  Find out exactly how much cash to keep on hand for 24-hour, 72-hour, and 7-day payment outages. Enter your daily spending and get a denomination-optimized bill mix so you can pay exact amounts when merchants can

  Calculators · Safety & emergencies

• Gig Math — Can You Fit Two Jobs in a 168-Hour Week?

  A simple visual calculator for juggling multiple jobs, side hustles, and basic life needs. Enter your weekly hours and see a single bar that shows exactly how much room you have left—or how badly you

  Calculators · Work & productivity

• Stay or Go: Quit-vs-Stay Break-Even Calculator

  A visual quit-vs-stay calculator. Enter six numbers, see two converging trajectory lines and the exact break-even month where leaving pays off. No predictions, no judgment.

  Calculators · Everyday life

• Real Wage Calculator | True Hourly Rate with Overtime & Commute

  See your real hourly wage after unpaid overtime and commute. Compare your nominal rate vs real rate and find out the annual value of labor you donate to your employer.

  Calculators · Money & crypto

• Speed Cost: Is Speeding Worth It? Time Saved vs Risk Calculator

  Speed Cost shows the exact tradeoff of speeding on your specific trip. Enter your route to instantly compare minutes saved vs increased stopping distance and fatality risk.

  Calculators · Safety & emergencies

• Gig Budget — Know Your All-In Concert Travel Cost in 30 Seconds

  Fast travel-cost estimator for concert-goers and sports fans. Enter home city, event city, dates, and travel tier. Get one honest itemized total with event-surge ranges labeled as estimates.

  Calculators · Travel & transport

• Offer Math: Compare Job Offer vs Current Job Including Commute

  Offer Math is a transparent job comparison tool that calculates your effective hourly rate by including unpaid commute time. Enter your current job and a new offer to instantly see the real compensation gap and make confident career decisions.

  Calculators · Work & productivity

• Night Total — See What a Night Out Really Costs

  An honest pre-spend calculator for concerts, dinners, games, and nights out. Enter the headline price, pick your activity and city, and get an itemized total with every forgotten cost — each citing its data source and year inline.

  Calculators · Money & crypto

• Heat Sense — Train Your Gut to Estimate the Heat Index

  Heat Sense is a 10-round guessing game that teaches you to intuitively estimate the feels-like temperature from temperature and humidity. Build a lifelong reflex for heat safety using the real NOAA formula.

  Calculators · Weather & climate

• Heat Safe — Safe Minutes Calculator for Outdoor Exercise in the Heat

  Heat Safe translates your local temperature and humidity into a personal activity time limit. Enter your conditions, pick your activity, and get a concrete minutes-based recommendation derived from NOAA heat index and NIOSH standards.

  Calculators · Weather & climate

• ⏱️ Life Cost — How many hours of your life does a purchase cost?

  Turn any price tag into hours of your irreplaceable time. Enter your hourly wage once, then just type a price. Instant comparison against your rent, groceries, and transit.

  Calculators · Money & crypto

• Rent vs Road — Which Apartment Truly Costs Less?

  A side-by-side rent vs. commute calculator that combines rent, fuel, wear, and depreciation into one honest monthly total for two apartments. See which place truly saves you money.

  Calculators · Money & crypto

• Sleep Gap Check — See How Much Sleep Your Child Loses

  Enter your child

  Calculators · Health & body

• Overwork Math — Is Overtime Worth It Calculator

  See what overtime really costs you in money and weekends before you say yes. A transparent overtime calculator that translates extra hours into lost time.

  Calculators · Science & space

• Bridge or Sink — Microloan Debt Spiral Calculator

  See the exact month a bridge loan becomes permanently more expensive than missing a payment — before you sign. A two-loan cascade calculator.

  Calculators · Money & crypto

• Buzz Check — Caffeine Calculator & Safety Meter

  Tap the drinks you

  Calculators · Safety & emergencies

• Charge Plan — Know What to Charge First in 30 Seconds

  A 30-second calculator for power outages. Pick devices, enter battery levels, set your time, and get a ranked charging plan with projected percentages and a family chat checklist.

  Calculators · Everyday life

• Deal Total — Compare Two Financing Offers by True Cost

  A neutral side-by-side calculator that compares two financing offers by true total cost and effective annual rate. See which "0% interest" or "low monthly" deal actually costs more in 30 seconds.

  Calculators · Everyday life

• Headline Math — Estimate the real stat behind the headline in 15 seconds

  A daily 5-question game where you see real news headlines with two verifiable numbers and estimate the derived statistic under time pressure. Get the exact answer, your accuracy, and the source line.

  Calculators · News & media

• True Share — Fair Sibling Contribution Calculator

  Turn sibling money disputes into a one-glance bar chart of proportional burden. Enter income and contribution to see who sacrifices most, and forward the proof to your family chat.

  Calculators · Money & crypto

• Sun Time ☀️ UV Index to Personal Burn Time Calculator

  See any UV index. Know your burn time in seconds. Pick your Fitzpatrick skin type, enter today

  Calculators · Health & body

• Wake Risk — Am I Too Tired to Drive? | BAC-Equivalent Calculator

  See how impaired you really are after poor sleep in one honest number. Enter hours awake and slept to get a BAC-equivalent score, reaction-time penalty, and go/caution/stop guidance before you drive.

  Calculators · Safety & emergencies

• Pantry Days — How long will your pantry food last?

  A caloric-sufficiency calculator for ordinary households. Tap pantry items, enter who lives at home, and see a personalized days-of-food number based on USDA data.

  Calculators · Food & drink

• Rent Fit — See What’s Left to Live On at 5 Rent Levels

  Enter your monthly after-tax income and instantly see five rent tiers from safe to dangerous, each showing exact dollars left per month and per day for everything else. Uses HUD cost-burden thresholds. No sign-up, no estimates, pure math.

  Calculators · Money & crypto

• Loan Ready — Debt-to-Income Ratio Calculator

  See your debt-to-income ratio, know if you qualify, and get the exact pay-down plan — before any credit pull.

  Calculators · Money & crypto

• Too Late? Crypto Pump Profit Calculator

  A two-input calculator showing how much more a crypto pump needs to gain for you to break even, double your money, or match early buyers. Built for the 60 seconds before you hit buy.

  Calculators · Money & crypto

• Break Even Move | When Does Your Move Pay Off?

  A break-even calculator for relocation. Enter rent, moving costs, and salary change to see the exact month your move pays for itself — plus a 5-year net projection.

  Calculators · Money & crypto

• Buy or Wait: Is the Price Drop Worth It? | Cost Per Use Calculator

  A 20-second calculator that turns four simple numbers into one gut-checkable cost per missed use. Decide instantly: buy now or wait for the sale.

  Calculators · Money & crypto

• Blanket Scale — Safe Weighted Blanket Weight Calculator

  Find your safe weighted-blanket weight in seconds. Enter your body weight, sleep position, and mobility to get a green-yellow-red weight range with an explicit red-line threshold.

  Calculators · Safety & emergencies

• Smoke Clock — Your Body Recovery Timeline & Pack-Years Calculator

  Enter your smoking history and quit date to get your pack-years score and a personal recovery timeline anchored to CDC-sourced milestones. Crossed milestones feel like victories; upcoming ones give you a reason to stay quit.

  Calculators · Everyday life

• Worth My Hours — See What It Really Costs You

  A free instant tool that reveals the true price of anything: after-tax work hours and 10-year invested value. Enter price and salary, get a shareable card in 5 seconds.

  Calculators · Money & crypto

• Headline Cost — Turn Economic News into Your Dollar Impact

  A free calculator that translates news headlines — gas prices, interest rates, inflation, currency moves — into your monthly and annual dollar impact. See the exact math behind your result.

  Calculators · News & media

• Sub or Buy — Subscription vs One-Time Purchase Calculator

  See exactly when subscribing costs more than buying it outright. Drag the slider to watch two cost lines cross in real-time and find your exact break-even month.

  Calculators · Everyday life

• Offer Compare — See the Real Value of Two Job Offers in 60 Seconds

  A free tool that compares two job offers side-by-side and converts salary, commute, vacation, benefits, and hours into one transparent total-value dollar number.

  Calculators · Work & productivity