個人財務（拡張） 計算機

Calculate percentage change between two values. Enter the original and new value — see the percent increase or decrease with formula. Free.

Find what percentage one number is of another. Enter the part and whole — get the percentage with decimal and fraction equivalents. Free.

Calculate what percent a number is of another. Enter part and total — see the percentage, decimal form, and cross-multiplication method. Free.

Professional markup percent and analysis. Instant result with amortization table, formula and chart. Free financial calculator.

Professional discount percent and analysis. Quick calculation with worked example and formula. Free everyday calculator.

Calculate Tip Split quickly and accurately. Enter your values — see the result with the formula, worked example, and unit options. Free.

Professional loan compare and analysis. Instant result with breakdown, formula and payment schedule. Free financial calculator.

Calculate savings from early loan payoff. Enter balance, rate, and extra payment — see payoff date, interest saved, and amortisation. Free.

Professional biweekly mortgage and analysis. Instant result with amortization table, formula and chart. Free financial calculator.

Calculate the maximum affordable rent based on income. Enter gross income — see 30% rule limit and budget-safe rental amount. Free.

Professional down payment and analysis. Instant result with breakdown, formula and payment schedule. Free financial calculator.

Estimate buyer's closing costs for a home purchase. Enter purchase price and location — see itemised costs totalling typically 2–5%. Free.

Professional moving budget and analysis. Instant result with breakdown, formula and payment schedule. Free financial calculator.

Estimate annual home maintenance costs. Enter home value and age — see recommended maintenance budget (1–4% rule). Free.

Calculate total monthly utility costs for your home. Enter appliance usage and rates — see electricity, gas, and water breakdown. Free.

Estimate monthly water bill from usage. Enter household size and water rate — see estimated monthly bill and conservation savings. Free.

Calculate monthly electricity bill from appliance usage. Enter kilowatt-hours and rate — see bill estimate and highest-cost appliances. Free.

Estimate monthly natural gas bill for heating and appliances. Enter therms and rate — see seasonal bill estimate and efficiency tips. Free.

Professional phone bill and analysis. Full formula with variable legend, worked example and step-by-step chemistry solution.

Compare internet plan costs and speed value. Enter speeds and prices — see cost per Mbps and best-value plan for your needs. Free.

Calculate how much life insurance your family needs. Enter income, debts, and dependents — see coverage with DIME/LINT formula. Free.

Compare health insurance plan costs (premiums + OOP). Enter plan details and expected usage — see total annual cost for each. Free.

Calculate optimal Roth IRA conversion amount. Enter traditional balance and tax bracket — see conversion benefit and future tax savings. Free.

Calculate required minimum distribution from retirement accounts. Enter account balance and age — see RMD amount using IRS life table. Free.

Calculate a safe withdrawal rate for retirement portfolios. Enter balance and spending — see years of portfolio survival at different rates. Free.

Calculate your Coast FIRE number and timeline. Enter target retirement spend and years — see amount needed to coast to FIRE. Free.

Calculate Barista FIRE scenario with part-time income. Enter spending, income, and portfolio — see portfolio needed and timeline. Free.

Calculate Fat FIRE number for high-spending retirement. Enter target annual spending — see required portfolio at 3.5–4% withdrawal. Free.

Calculate Lean FIRE number for frugal early retirement. Enter lean annual spend — see required portfolio and years to accumulate it. Free.

Calculate months of emergency fund based on expenses. Enter monthly costs and current savings — see months covered and target. Free.

Professional snowflake debt and analysis. Instant result with amortization table, formula and chart. Free financial calculator.

Calculate balance transfer savings from a lower interest rate. Enter balance, rates, and fee — see interest saved and payoff timeline. Free.

Professional credit card payoff and analysis. Instant result with breakdown, formula and payment schedule. Free financial calculator.

Professional credit score factors and analysis. Instant result with breakdown, formula and payment schedule. Free financial calculator.

Professional mortgage payment and analysis. Instant result with amortization table, formula and chart. Free financial calculator.

Professional a r m mortgage and analysis. Instant result with amortization table, formula and chart. Free financial calculator.

Professional interest only and analysis. Instant result with breakdown, formula and payment schedule. Free financial calculator.

Professional balloon payment and analysis. Instant result with breakdown, formula and payment schedule. Free financial calculator.

Calculate per diem allowance for business travel. Enter location and days — see GSA daily rate for meals, lodging, and incidentals. Free.

Professional stipend and analysis. Quick calculation with worked example and formula. Free everyday calculator.

Calculate the fair market value exchange for barter transactions. Enter goods/services and market rates — see equivalent cash value. Free.

Estimate coin collection value by denomination and condition. Enter coin details — see numismatic and melt value estimates. Free.

Look up the estimated collector value of any postage stamp. Enter country, year, and denomination — see mint/used values and condition grades. Free.

Look up ideal weight ranges for any dog breed. Enter breed — see healthy weight range, growth chart, and BCS guidance. Free.

Professional pregnancy week and analysis. Based on clinical and medical guidelines. Instant result with week-by-week context.

Professional baby milk and analysis. Based on clinical and medical guidelines. Instant result with week-by-week context.

Calculate total diaper cost per year and per stage. Enter brand, price, and changes per day — see monthly and yearly spend. Free.

Calculate ROI on a college degree. Enter tuition, earnings premium, and years — see break-even point and lifetime return. Free.

Professional career salary and analysis. Instant result with amortization table, formula and chart. Free financial calculator.

Professional retirement gap and analysis. Instant result with amortization table, formula and chart. Free financial calculator.

Professional width converter and analysis. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Calculate the true cost per page of printer ink. Enter cartridge price and yield — see cost per page and compare to alternatives. Free.

Calculate file size in different units. Enter size value — see conversion between bytes, KB, MB, GB, and TB. Free.

Calculate storage needed for data backup. Enter data size and backup frequency — see total storage requirement and cost estimate. Free.

Estimate monthly cloud storage cost across providers. Enter data size and access frequency — see cost on AWS S3, GCP, and Azure. Free.