Calculator for Finance
39 calculator tools hand-picked for Finance.
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APR to APY Calculator
Convert nominal APR to effective APY (and back) at any compounding frequency — daily, monthly, quarterly, or continuous. Two-way, instant, browser-only.
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Blood Alcohol Content (BAC) Calculator
Widmark-formula BAC estimate from drinks, body weight, sex and time — educational only, never a fit-to-drive verdict — browser-only
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BMI Calculator
Body Mass Index calculator with WHO + Asian classifications — metric and imperial — browser-only
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Break-Even Calculator
How many units must you sell to stop losing money? Enter fixed costs, price, and variable cost per unit for break-even units, break-even revenue, and contribution margin — browser-only
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Calories Burned Calculator
MET-based calorie burn for 30+ activities — running, cycling, swimming, HIIT, housework — stack and total — browser-only
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Car Lease Calculator
Cap cost, residual, money factor, term → exact monthly payment with depreciation + finance + tax breakdown — 100% in your browser
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CD Calculator
Certificate of Deposit maturity, interest & effective APY — APY or APR + compounding, early-withdrawal penalty, CD ladder — browser-only
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Chinese Numeric Converter
Arabic ⇄ Chinese number — simple (一二三), formal (壹貳參), or amount (金额大写 with 元角分).
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Commission Calculator
Work out sales commission three ways — flat rate, progressive tiers, or reverse-solve the sales you need to hit an income target. Browser-only, shareable.
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Crypto Profit Calculator
Net profit, ROI%, fees, and the break-even sell price for a crypto trade — enter by quantity or by amount invested, both buy and sell fees counted — browser-only
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Date Difference Calculator
Days / weeks / months / years between two dates — plus business-days mode — browser-only
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Debt Payoff Calculator
Snowball vs avalanche — payoff date, total interest, and what an extra payment saves — browser-only
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Dividend Yield Calculator
Share price + annual dividend → yield %, annual/quarterly/monthly income, and yield on cost after years of dividend growth — browser-only
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Electricity Cost Calculator
Power × hours × tariff → kWh and cost per day, month, and year — add multiple appliances, account for standby — browser-only.
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Expense Tracker
Expense tracker — log spend, categorize, see monthly totals, all in your browser.
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Freelance Hourly Rate Calculator
Back into the hourly rate you must charge from your target salary, business expenses, billable hours, profit margin, and taxes — browser-only
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Future Value Calculator
Project the future value of a lump sum plus regular contributions — full time-value-of-money math, year-by-year, browser-only
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Home Affordability Calculator
Income + debt + down payment + rate → the max home price a lender's 28/36 rule will actually approve — browser-only
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Ideal Weight Calculator
Devine + Robinson + Miller + Hamwi formulas, side by side, plus the healthy BMI weight band — metric and imperial — browser-only
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China Income Tax Calculator
China personal income tax calculator — monthly, annual, with 5 insurance + 1 fund deductions.
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LLM Pricing Calculator
Estimate daily and monthly LLM spend from tokens, request volume, and editable model prices.
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Mortgage Calculator
Mortgage calculator — monthly payment, total interest, amortization schedule, early payoff scenarios.
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MPG Calculator
Distance + fuel → MPG (US/UK), L/100km, km/L, all at once + cost per mile/km — browser-only
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Net Worth Calculator
Add up assets, subtract debts, see your real net worth — with a debt-to-asset ratio and composition bars, all computed in your browser
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Payment Processing Fee Calculator
Stripe, PayPal, Square fees — see what lands in your account, and gross-up to net any target — 100% in your browser
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Percentage Calculator
5 common percentage calculations — "x% of y", "x is what% of y", percentage change, increase/decrease — instant, browser-only
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Barbell Plate Calculator
Target weight → exactly which plates to slide on each end — kg & lb, with a live barbell diagram — browser-only
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Pregnancy Weight Gain Calculator
Pre-pregnancy BMI + week → IOM recommended total gain, the by-week target, and an on-track check — singleton & twins — browser-only
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Rent Affordability Calculator
How much rent can you actually afford? 30% rule, landlord 3× gate, and a debt-aware 50/30/20 number — all client-side
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Rent vs Buy Calculator
See whether buying beats renting and investing the difference — net cost, terminal equity, and the break-even year, all in your browser
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Retirement Savings Calculator
Project your retirement pot from age, savings, monthly contributions, return and inflation — with a 4% safe-withdrawal income, growth curve, and goal-gap check. Browser-only.
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Rule of 72 Calculator
Estimate doubling time from a rate (72 ÷ r), or the rate from a target time — side by side with the exact ln(2)/ln(1+r) figure — browser-only
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Salary Raise Calculator
Turn a raise into real numbers — new salary by year/month/hour, dollar increase, and the inflation-adjusted raise that tells you if you actually came out ahead
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Sales Tax Calculator
Add or remove US sales tax — split state + local rates, real 2024 state base rates on tap, browser-only
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Simple Interest Calculator
I = P × r × t — solve for interest, principal, rate, or time, plus total and a simple-vs-compound gap — browser-only
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Take-Home Pay Calculator
Gross → net pay, any country — your own tax rate, pre-tax & post-tax deductions, reverse-solve — browser-only
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Unix Timestamp Converter
Unix timestamp ⇄ human date — seconds / milliseconds / ISO 8601 — UTC and local — browser-only
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Unit Converter
Convert between length, weight, temperature, area, volume, speed, time — instant, browser-only
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Waist-to-Hip Ratio Calculator
WHR = waist ÷ hip, scored against the WHO health-risk bands by sex, with an optional waist-to-height check — runs entirely in your browser