Reken het uit.

Rekenmachines

Reken alles uit rond geld, gezondheid en tijd — zonder je gegevens aan wie dan ook af te staan.

133 tools beschikbaar

Rent Affordability Calculator

Find out how much rent you can afford based on your income.

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Shopify Shipping Simulator

Estimate shipping cost and margin on a Shopify order.

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Appliance Energy Cost Calculator

Calculate how much an appliance costs you per month and per year.

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Daily Distraction Cost Calculator

See how much time and money distractions cost you every year.

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Tip Calculator

Split the bill fairly and pick the right tip percentage.

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Compound Interest Calculator

Visualize how your investments grow over time with compound interest.

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Mortgage Payment Calculator

Estimate your monthly mortgage payment including taxes and insurance.

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Savings Goal Calculator

Find out how much to save each month to hit any goal.

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Discount / Sale Price Calculator

Calculate the final price, savings, and effective percentage off.

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Meeting Cost Calculator

See how much every minute of a meeting actually costs.

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Age Calculator

Calculate exact age in years, months, days, hours, and minutes.

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Days Between Dates

Calculate the exact gap between two dates in days, weeks, and months.

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Reading Time Estimator

Estimate how long it takes to read any text aloud or silently.

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Aspect Ratio Calculator

Calculate scaled dimensions for any aspect ratio.

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Etsy Fee Calculator

See exactly what Etsy takes from each sale.

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Profit Margin Calculator

Calculate gross and net profit margins on any product.

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Trip ETA Calculator

Calculate arrival time for a trip by distance and speed.

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Debt Payoff Calculator (Snowball vs Avalanche)

Compare the debt snowball and avalanche strategies and see which saves you more.

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Car Payment Calculator

Estimate your monthly car payment, total interest, and total cost of an auto loan.

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Mortgage Refinance Break-Even Calculator

Find out how long it takes to break even on a refinance — and whether it’s worth it.

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Startup Burn Rate & Runway Calculator

See how fast you’re burning cash and how many months of runway you have left.

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Instagram / TikTok Engagement Rate

Calculate your true engagement rate and see how you compare to your niche.

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50/30/20 Budget Calculator

Build a balanced monthly budget in one screen using the 50/30/20 rule.

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Loan Amortization Schedule

See exactly how much of each payment goes to interest vs principal over the life of any loan.

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Retirement 401(k) / IRA Calculator

Project your retirement balance and see if you’re on track.

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Crypto Dollar-Cost Averaging Calculator

See the future value of a recurring BTC/ETH buy and its average entry price.

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SIP / Mutual Fund Return Calculator

Project the future value of a monthly SIP / mutual fund investment.

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Breakeven Analysis (Small Business)

Find the exact sales volume you need to cover all your costs and turn a profit.

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Real Estate ROI & Cap Rate

Compute cap rate, cash-on-cash return, and total ROI on a rental property.

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Freelancer Day Rate Calculator

Find the hourly or day rate you need to hit your target salary as a freelancer.

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Inflation Calculator

See how much purchasing power $X in year Y is worth in today’s dollars.

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Time Card / Hours Calculator

Add clock-in / clock-out times and get total hours, overtime, and pay.

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Tax Withholding Estimator (2026)

Estimate your U.S. federal tax, FICA, and net paycheck from a W-2 salary.

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Group Cost Splitter

Split a trip, dinner, or shared cost evenly — or with custom shares, deposits, and tips.

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Mortgage Discount Points Calculator

Decide whether to buy down your mortgage rate with discount points.

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Blood Alcohol Estimator (Widmark)

Estimate your BAC over time using the Widmark formula — strictly educational.

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ISO Week Number Calculator

Get the ISO 8601 week number, weekday, and day-of-year for any date.

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Roth vs Traditional 401(k) Comparison

See whether a Roth or Traditional 401(k) leaves more money in your pocket at retirement.

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Sun & Golden Hour Calculator

Get sunrise, sunset, golden hour and blue hour times for any date and location.

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ND Filter Long-Exposure Calculator

Find the right ND filter and exposure time for any daylight long exposure.

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Depth of Field Calculator

Compute near, far, and total depth of field for any lens and aperture.

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Exposure Value (EV) Calculator

Compute and convert EV at any aperture, shutter, and ISO combination.

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Zelfstandigen belasting schatter (Schedule SE)

Schat SS + Medicare over 1099 inkomsten.

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Quarterly Estimated Tax Calculator

Compute your quarterly 1040-ES payment to avoid an IRS underpayment penalty.

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Speedometer Error & Tire Size Calculator

See how your real speed and odometer change when you change tire size.

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EV vs Gas Car Savings Calculator

Compare total 5-year cost of an EV vs the gas equivalent — fuel, maintenance, depreciation.

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Lease vs Buy Car Calculator

See whether leasing or buying is cheaper over the period you actually keep the car.

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Meat Cook Time by Weight

Estimate cook time and target internal temperature for any cut and method.

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ROAS & Marketing ROI Calculator

Compute Return on Ad Spend, CAC, break-even, and target CPA from your numbers.

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Stripe / PayPal / Square Fee Calculator

See the real fee on every payment processor — Stripe, PayPal, Square, and more.

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Wedding Alcohol / Drink Calculator

Estimate the right number of bottles, beer cases, and mixers for a party.

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Net Worth Snapshot Calculator

Tally assets and liabilities to compute a private net-worth snapshot.

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Emergency Fund Calculator

See how big your emergency fund should be and how long to build it.

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Seed & Plant Spacing Calculator

See how many plants fit a bed and how far apart to space them.

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Baker's Percentage Calculator

Convert any bread recipe to baker's percentages or scale to a target dough weight.

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Sourdough Hydration Calculator

Find the dough hydration percentage from flour and water weights.

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Meat Internal Temperature Guide

Pull temperatures and carryover cook times for beef, pork, poultry, and fish.

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Pan Size Converter

Adjust batter volume and bake time when swapping pan sizes.

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Oven Temperature Converter

Convert between °F, °C, Gas Mark, and convection with fan offset.

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ABV Calculator (Homebrew)

Compute alcohol by volume from gravity readings (OG / FG).

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Mash Water & Strike Temp Calculator

Strike temperature and total water volume from grain bill + mash thickness.

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Hop Utilization / IBU Calculator

Estimate IBU from hop weight, AA%, boil time, and wort gravity (Tinseth).

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Yeast Starter Calculator

Starter size and stir-plate recommendation from target OG and volume.

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Priming Sugar Calculator

How much corn sugar / DME to carbonate your bottled beer.

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Brewing Water Chemistry Calculator

Adjust mash water with salts to hit a target water profile.

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Tire Size Comparison

Compare two tire specs by diameter, width, and speedometer error.

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Fuel Cost per Mile

Cost per mile or kilometer from MPG and fuel price.

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Engine Oil Capacity Calculator

How many quarts / liters of oil your engine needs.

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Windshield Washer Fluid Dilution

Methanol ratio for any freeze point at any volume.

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Ceramic Coating Coverage Calculator

Milliliters per panel for a full-car ceramic coating.

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Yarn Yardage Estimator

Estimate total yardage for a blanket, scarf, sweater, or amigurumi.

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Gauge Swatch Converter

Rescale a pattern when your swatch does not match.

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Depth of Field Calculator

Near / far focus limits and total DOF for any lens + aperture combo.

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Exposure Triangle Calculator

Equivalent exposures when swapping aperture, shutter, or ISO.

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Golden Hour / Blue Hour Calculator

Sunrise, sunset, golden hour, and blue hour times for any date and location.

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Print Size & DPI Calculator

Maximum print size from sensor megapixels at a target DPI.

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Screenplay Runtime Estimator

Estimate feature runtime from page count and dialogue density.

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Book Royalty Calculator

Earnings from advance, royalty rate, and projected sales.

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Wedding Budget Split

Allocate your total budget across venue, catering, photography, and more.

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Wedding Cake Serving Calculator

Servings per tier and total servings needed for your guest count.

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Seating Chart Capacity Calculator

How many guests fit at round, rectangular, or farmhouse tables.

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Backpack Weight Calculator

Total pack weight and percent of body weight carried.

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Hike Water Needs Calculator

Liters of water for any distance, elevation, temperature, and pack weight.

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Elevation Pace Adjustment Calculator

Adjust your flat-pace estimate for elevation gain and loss.

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Baby Age Calculator

Months, weeks, and days old from birth date, with adjusted age for preemies.

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Baby Formula Amount Calculator

Daily ounces from age/weight plus per-feed bottle size.

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Child Growth Percentile Calculator

Height, weight, and BMI percentile from CDC or WHO charts.

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Salary-to-Hourly Calculator

Convert annual salary to true hourly rate after PTO, commute, and benefits.

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Debt Avalanche vs Snowball Calculator

Side-by-side payoff month and total interest for both methods.

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US Tax Bracket Calculator (2024)

Marginal and effective tax rate plus take-home pay.

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Savings Rate Calculator

What percent of your income are you actually saving.

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Days Together / Anniversary Counter

Exact years, months, days since your anniversary — and milestone badges.

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Language Hours to Fluency

FSI hours from zero to A2 / B1 / B2 / C1 / C2 for any language.

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Anki Retention Calculator

Project your long-term recall rate and review load.

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Resume Bullet Word Counter & Strength Score

Count words, flag weak verbs, and suggest stronger action-verb rewrites.

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Salary Negotiation Anchor Calculator

Set your walk-away, target, and anchor numbers before the offer call.

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Tax Withholding Estimator

See how much federal tax to withhold per paycheck to get a refund (or owe $0).

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Roth IRA MAGI Phase-out

Compute your MAGI and see how much Roth IRA contribution you're allowed.

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Cost-of-Living Compare

Estimate the equivalent salary and rent burden in any US metro.

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CD vs HYSA

Is a CD worth locking up your cash for the small APY bump?

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Family Sale Gift Tax Estimator

Estimate the gift-tax exposure on a below-market sale from family.

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529-to-Roth Rollover Optimizer

See how much of your 529 can move into a Roth — and the tax traps.

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Lease Buyout Calculator

Decide whether to buy out your lease, surrender it, or sell privately.

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Credit Score Converter

Translate between VantageScore, FICO 8, FICO Auto, and FICO Mortgage.

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401(k) / 403(b) Fee Drag

See how much a maintenance fee is costing your retirement over time.

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Raise vs Inflation

Does your annual raise actually beat inflation?

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CD Ladder Yield

Build a CD ladder and see the realised yield across rungs.

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Real Return After Tax & Inflation

See what your '7% return' actually becomes after tax, fees, and inflation.

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Crypto perpetual funding-fee

Schat de cumulatieve funding-fees op een leveraged crypto-positie.

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Staking-beloning belastingcalculator

Schat de belasting op jaarlijkse staking-/lending-opbrengsten.

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Bitcoin 4 %-regel

Schat hoeveel BTC je nodig hebt zodat floor-groei je uitgaven dekt.

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Bitcoin netwerk-fee schatter

Zie de sat/vB en USD kosten van een Bitcoin-transactie.

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Crypto 1099-DA basis validator

Verreken crypto-kostenbasis met de nieuwe 1099-DA.

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Crypto-kostenbasis herstel

Schat hoeveel basis hersteld moet worden om 8949 in evenwicht te krijgen.

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Borgsom-restitutie schatter

Schat hoeveel van de borg de verhuurder mag aftrekken en wat je terugkrijgt.

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Leasen vs kopen (met restwaarde)

Beslis of je een auto least of contant koopt.

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Autolening verborgen kosten detector

Vergelijk de aangeboden maandtermijn met de wiskunde van de geadverteerde rente.

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Bitcoin mining-pool vergelijking

Vergelijk pool-fees en opbrengst voor je hash-rate.

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SaaS zombie-seat detector

Identificeer ongebruikte SaaS-seats en maandelijkse kosten.

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Cloud-opslag TCO

Schat de maandelijkse en jaarlijkse kosten van S3 / Wasabi / B2 opslag.

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Kinderbijslag richtlijn schatter

Schat de maandelijkse kinderbijslag.

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Langdurige zorg verzekering vs zelf betalen

Bepaal of een LTC-verzekering loont.

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Last-mile verzendkosten

Schat de kosten per pakket voor last-mile verzending.

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Woning betaalbaarheid uit inkomen

Schat de woningprijs die je kunt betalen uit bruto maandinkomen.

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ESPP met lookback-waarde

Schat waarde en belasting van een ESPP-aanbieding met lookback.

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Wi-Fi upgrade ROI

Zie of een Wi-Fi 6E/7-upgrade loont.

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LLM-API maandelijkse kosten

Schat de kosten voor LLM-inferentie bij een maandelijks volume.

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Aandelengrant verdunning en waarde

Bereken de vestingwaarde en spread van een grant.

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Aanbiedingsscore vs laagste ooit

Beoordeel een huidige verkoopprijs tegen de laagste ooit.

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Leestijd schatter

Schat de leestijd voor een boek of PDF.

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Klein magazijn bouwkosten

Schat capex en maandelijkse opex voor een klein magazijn / 3PL.

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Lokale AI-inferentiekosten

Zie of lokale LLM op een GPU goedkoper is dan een API.

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GPU-cloud instantiekosten

Vergelijk on-demand, spot en reserved GPU-instantiekosten.

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