数字を計算する。
計算機
お金、健康、時間に関する必要な計算を、データを誰にも渡さずに行えます。
133個のツールを利用可能
Rent Affordability Calculator
Find out how much rent you can afford based on your income.
ツールを開く
Shopify Shipping Simulator
Estimate shipping cost and margin on a Shopify order.
ツールを開く
Appliance Energy Cost Calculator
Calculate how much an appliance costs you per month and per year.
ツールを開く
Daily Distraction Cost Calculator
See how much time and money distractions cost you every year.
ツールを開く
Tip Calculator
Split the bill fairly and pick the right tip percentage.
ツールを開く
Compound Interest Calculator
Visualize how your investments grow over time with compound interest.
ツールを開く
Mortgage Payment Calculator
Estimate your monthly mortgage payment including taxes and insurance.
ツールを開く
Savings Goal Calculator
Find out how much to save each month to hit any goal.
ツールを開く
Discount / Sale Price Calculator
Calculate the final price, savings, and effective percentage off.
ツールを開く
Meeting Cost Calculator
See how much every minute of a meeting actually costs.
ツールを開く
Age Calculator
Calculate exact age in years, months, days, hours, and minutes.
ツールを開く
Days Between Dates
Calculate the exact gap between two dates in days, weeks, and months.
ツールを開く
Reading Time Estimator
Estimate how long it takes to read any text aloud or silently.
ツールを開く
Aspect Ratio Calculator
Calculate scaled dimensions for any aspect ratio.
ツールを開く
Etsy Fee Calculator
See exactly what Etsy takes from each sale.
ツールを開く
Profit Margin Calculator
Calculate gross and net profit margins on any product.
ツールを開く
Trip ETA Calculator
Calculate arrival time for a trip by distance and speed.
ツールを開く
Debt Payoff Calculator (Snowball vs Avalanche)
Compare the debt snowball and avalanche strategies and see which saves you more.
ツールを開く
Car Payment Calculator
Estimate your monthly car payment, total interest, and total cost of an auto loan.
ツールを開く
Mortgage Refinance Break-Even Calculator
Find out how long it takes to break even on a refinance — and whether it’s worth it.
ツールを開く
Startup Burn Rate & Runway Calculator
See how fast you’re burning cash and how many months of runway you have left.
ツールを開く
Instagram / TikTok Engagement Rate
Calculate your true engagement rate and see how you compare to your niche.
ツールを開く
50/30/20 Budget Calculator
Build a balanced monthly budget in one screen using the 50/30/20 rule.
ツールを開く
Loan Amortization Schedule
See exactly how much of each payment goes to interest vs principal over the life of any loan.
ツールを開く
Retirement 401(k) / IRA Calculator
Project your retirement balance and see if you’re on track.
ツールを開く
Crypto Dollar-Cost Averaging Calculator
See the future value of a recurring BTC/ETH buy and its average entry price.
ツールを開く
SIP / Mutual Fund Return Calculator
Project the future value of a monthly SIP / mutual fund investment.
ツールを開く
Breakeven Analysis (Small Business)
Find the exact sales volume you need to cover all your costs and turn a profit.
ツールを開く
Real Estate ROI & Cap Rate
Compute cap rate, cash-on-cash return, and total ROI on a rental property.
ツールを開く
Freelancer Day Rate Calculator
Find the hourly or day rate you need to hit your target salary as a freelancer.
ツールを開く
Inflation Calculator
See how much purchasing power $X in year Y is worth in today’s dollars.
ツールを開く
Time Card / Hours Calculator
Add clock-in / clock-out times and get total hours, overtime, and pay.
ツールを開く
Tax Withholding Estimator (2026)
Estimate your U.S. federal tax, FICA, and net paycheck from a W-2 salary.
ツールを開く
Group Cost Splitter
Split a trip, dinner, or shared cost evenly — or with custom shares, deposits, and tips.
ツールを開く
Mortgage Discount Points Calculator
Decide whether to buy down your mortgage rate with discount points.
ツールを開く
Blood Alcohol Estimator (Widmark)
Estimate your BAC over time using the Widmark formula — strictly educational.
ツールを開く
ISO Week Number Calculator
Get the ISO 8601 week number, weekday, and day-of-year for any date.
ツールを開く
Roth vs Traditional 401(k) Comparison
See whether a Roth or Traditional 401(k) leaves more money in your pocket at retirement.
ツールを開く
Sun & Golden Hour Calculator
Get sunrise, sunset, golden hour and blue hour times for any date and location.
ツールを開く
ND Filter Long-Exposure Calculator
Find the right ND filter and exposure time for any daylight long exposure.
ツールを開く
Depth of Field Calculator
Compute near, far, and total depth of field for any lens and aperture.
ツールを開く
Exposure Value (EV) Calculator
Compute and convert EV at any aperture, shutter, and ISO combination.
ツールを開く
自営業税推定 (Schedule SE)
1099 所得に対する SS + Medicare を推定。
ツールを開く
Quarterly Estimated Tax Calculator
Compute your quarterly 1040-ES payment to avoid an IRS underpayment penalty.
ツールを開く
Speedometer Error & Tire Size Calculator
See how your real speed and odometer change when you change tire size.
ツールを開く
EV vs Gas Car Savings Calculator
Compare total 5-year cost of an EV vs the gas equivalent — fuel, maintenance, depreciation.
ツールを開く
Lease vs Buy Car Calculator
See whether leasing or buying is cheaper over the period you actually keep the car.
ツールを開く
Meat Cook Time by Weight
Estimate cook time and target internal temperature for any cut and method.
ツールを開く
ROAS & Marketing ROI Calculator
Compute Return on Ad Spend, CAC, break-even, and target CPA from your numbers.
ツールを開く
Stripe / PayPal / Square Fee Calculator
See the real fee on every payment processor — Stripe, PayPal, Square, and more.
ツールを開く
Wedding Alcohol / Drink Calculator
Estimate the right number of bottles, beer cases, and mixers for a party.
ツールを開く
Net Worth Snapshot Calculator
Tally assets and liabilities to compute a private net-worth snapshot.
ツールを開く
Emergency Fund Calculator
See how big your emergency fund should be and how long to build it.
ツールを開く
Seed & Plant Spacing Calculator
See how many plants fit a bed and how far apart to space them.
ツールを開く
Baker's Percentage Calculator
Convert any bread recipe to baker's percentages or scale to a target dough weight.
ツールを開く
Sourdough Hydration Calculator
Find the dough hydration percentage from flour and water weights.
ツールを開く
Meat Internal Temperature Guide
Pull temperatures and carryover cook times for beef, pork, poultry, and fish.
ツールを開く
Pan Size Converter
Adjust batter volume and bake time when swapping pan sizes.
ツールを開く
Oven Temperature Converter
Convert between °F, °C, Gas Mark, and convection with fan offset.
ツールを開く
ABV Calculator (Homebrew)
Compute alcohol by volume from gravity readings (OG / FG).
ツールを開く
Mash Water & Strike Temp Calculator
Strike temperature and total water volume from grain bill + mash thickness.
ツールを開く
Hop Utilization / IBU Calculator
Estimate IBU from hop weight, AA%, boil time, and wort gravity (Tinseth).
ツールを開く
Yeast Starter Calculator
Starter size and stir-plate recommendation from target OG and volume.
ツールを開く
Priming Sugar Calculator
How much corn sugar / DME to carbonate your bottled beer.
ツールを開く
Brewing Water Chemistry Calculator
Adjust mash water with salts to hit a target water profile.
ツールを開く
Tire Size Comparison
Compare two tire specs by diameter, width, and speedometer error.
ツールを開く
Fuel Cost per Mile
Cost per mile or kilometer from MPG and fuel price.
ツールを開く
Engine Oil Capacity Calculator
How many quarts / liters of oil your engine needs.
ツールを開く
Windshield Washer Fluid Dilution
Methanol ratio for any freeze point at any volume.
ツールを開く
Ceramic Coating Coverage Calculator
Milliliters per panel for a full-car ceramic coating.
ツールを開く
Yarn Yardage Estimator
Estimate total yardage for a blanket, scarf, sweater, or amigurumi.
ツールを開く
Gauge Swatch Converter
Rescale a pattern when your swatch does not match.
ツールを開く
Depth of Field Calculator
Near / far focus limits and total DOF for any lens + aperture combo.
ツールを開く
Exposure Triangle Calculator
Equivalent exposures when swapping aperture, shutter, or ISO.
ツールを開く
Golden Hour / Blue Hour Calculator
Sunrise, sunset, golden hour, and blue hour times for any date and location.
ツールを開く
Print Size & DPI Calculator
Maximum print size from sensor megapixels at a target DPI.
ツールを開く
Screenplay Runtime Estimator
Estimate feature runtime from page count and dialogue density.
ツールを開く
Book Royalty Calculator
Earnings from advance, royalty rate, and projected sales.
ツールを開く
Wedding Budget Split
Allocate your total budget across venue, catering, photography, and more.
ツールを開く
Wedding Cake Serving Calculator
Servings per tier and total servings needed for your guest count.
ツールを開く
Seating Chart Capacity Calculator
How many guests fit at round, rectangular, or farmhouse tables.
ツールを開く
Backpack Weight Calculator
Total pack weight and percent of body weight carried.
ツールを開く
Hike Water Needs Calculator
Liters of water for any distance, elevation, temperature, and pack weight.
ツールを開く
Elevation Pace Adjustment Calculator
Adjust your flat-pace estimate for elevation gain and loss.
ツールを開く
Baby Age Calculator
Months, weeks, and days old from birth date, with adjusted age for preemies.
ツールを開く
Baby Formula Amount Calculator
Daily ounces from age/weight plus per-feed bottle size.
ツールを開く
Child Growth Percentile Calculator
Height, weight, and BMI percentile from CDC or WHO charts.
ツールを開く
Salary-to-Hourly Calculator
Convert annual salary to true hourly rate after PTO, commute, and benefits.
ツールを開く
Debt Avalanche vs Snowball Calculator
Side-by-side payoff month and total interest for both methods.
ツールを開く
US Tax Bracket Calculator (2024)
Marginal and effective tax rate plus take-home pay.
ツールを開く
Savings Rate Calculator
What percent of your income are you actually saving.
ツールを開く
Days Together / Anniversary Counter
Exact years, months, days since your anniversary — and milestone badges.
ツールを開く
Language Hours to Fluency
FSI hours from zero to A2 / B1 / B2 / C1 / C2 for any language.
ツールを開く
Anki Retention Calculator
Project your long-term recall rate and review load.
ツールを開く
Resume Bullet Word Counter & Strength Score
Count words, flag weak verbs, and suggest stronger action-verb rewrites.
ツールを開く
Salary Negotiation Anchor Calculator
Set your walk-away, target, and anchor numbers before the offer call.
ツールを開く
Tax Withholding Estimator
See how much federal tax to withhold per paycheck to get a refund (or owe $0).
ツールを開く
Roth IRA MAGI Phase-out
Compute your MAGI and see how much Roth IRA contribution you're allowed.
ツールを開く
Cost-of-Living Compare
Estimate the equivalent salary and rent burden in any US metro.
ツールを開く
CD vs HYSA
Is a CD worth locking up your cash for the small APY bump?
ツールを開く
Family Sale Gift Tax Estimator
Estimate the gift-tax exposure on a below-market sale from family.
ツールを開く
529-to-Roth Rollover Optimizer
See how much of your 529 can move into a Roth — and the tax traps.
ツールを開く
Lease Buyout Calculator
Decide whether to buy out your lease, surrender it, or sell privately.
ツールを開く
Credit Score Converter
Translate between VantageScore, FICO 8, FICO Auto, and FICO Mortgage.
ツールを開く
401(k) / 403(b) Fee Drag
See how much a maintenance fee is costing your retirement over time.
ツールを開く
Raise vs Inflation
Does your annual raise actually beat inflation?
ツールを開く
CD Ladder Yield
Build a CD ladder and see the realised yield across rungs.
ツールを開く
Real Return After Tax & Inflation
See what your '7% return' actually becomes after tax, fees, and inflation.
ツールを開く
クリプト・パーペチュアル・ファンディング料
レバレッジをかけたクリプトポジションの累積ファンディング料を推定。
ツールを開く
ステーキング報酬の税金計算
年間のステーキング/レンディング報酬にかかる税金を推定。
ツールを開く
Bitcoin 4%ルール
支出をフロア成長でカバーするのに必要な BTC 量を推定。
ツールを開く
Bitcoin ネットワーク手数料推定
Bitcoin トランザクションの sat/vB と USD コストを確認。
ツールを開く
クリプト 1099-DA 取得価額検証
新しい 1099-DA に対してクリプトの取得価額を照合。
ツールを開く
クリプト取得価額リカバリー
Form 8949 を均衡させるために回収すべき取得価額を推定。
ツールを開く
敷金返還計算
大家が控除できる金額と返還される金額を推定。
ツールを開く
リース vs 購入（残価あり）
車をリースするか一括購入するか決定。
ツールを開く
自動車ローン隠れた手数料検出
提示された月々の支払額と実際の APR の整合性を確認。
ツールを開く
Bitcoin マイニングプール比較
ハッシュレートに対するプール手数料と収益を比較。
ツールを開く
SaaS ゾンビシート検出
未使用の SaaS シートと月額コストを特定。
ツールを開く
クラウドストレージ TCO
S3 / Wasabi / B2 の月額・年額コストを推定。
ツールを開く
養育費ガイドライン推定
月々の養育費を推定。
ツールを開く
介護保険 vs 自費
介護保険加入が有利か判定。
ツールを開く
ラストマイル配送コスト
小型 EC ショップの 1 パッケージあたり配送コストを推定。
ツールを開く
月収から買える住宅価格
手取り月収から購入可能な住宅価格を推定。
ツールを開く
ESPP ルックバック価値
ESPP プランの価値と税金を推定。
ツールを開く
Wi-Fi アップグレード ROI
Wi-Fi 6E/7 へのアップグレードが価値を生むか判定。
ツールを開く
LLM API 月額コスト
LLM 推論の月額コストを推定。
ツールを開く
株式付与希薄化と価値
権利確定価値とスプレッドを計算。
ツールを開く
Deal スコア vs 過去最安値
現在価格を過去最安値と比較して採点。
ツールを開く
読書時間推定
本や PDF の読書時間を推定。
ツールを開く
小規模倉庫建築コスト
小規模倉庫 / 3PL の設備 capex と月次 opex を推定。
ツールを開く
ローカル AI 推論コスト
GPU でローカル LLM を動かす方が API より安いか判定。
ツールを開く
GPU クラウドインスタンスコスト
オンデマンド、スポット、リザーブドの GPU インスタンスを比較。
ツールを開く