Developer Utilities
Small developer utilities that save a trip to a random website. Encode and decode Base64, explain a regex, build UTM links, generate QR codes and vCards, and more — the everyday helpers. Free in your browser, and available by API when you need them in a script.
Developer Utilities
Mortgage PMI cost calculator
monthly PMI until cancel
POST /finance/mortgage-pmi-estimate$0.002Developer Utilities
Discount Points Break-Even Calculator
POST /finance/mortgage-points-breakeven-months$0.002Developer Utilities
Rule of 78 interest schedule calculator
sum-of-digits allocation
POST /finance/rule-of-78-interest$0.002Developer Utilities
Second mortgage payment calculator
monthly payment and total interest
POST /finance/second-mortgage-payment$0.002Developer Utilities
Annualized return calculator
total return to yearly rate
POST /finance/annualized-return$0.002Developer Utilities
Dividend Income Target Calculator
POST /finance/dividend-income-needed$0.002Developer Utilities
Dividend Reinvestment (DRIP) Calculator
POST /finance/drip-reinvestment$0.002Developer Utilities
Biweekly Mortgage Payoff Calculator
Interest and Time Saved
POST /finance/mortgage-biweekly$0.002Developer Utilities
Mortgage prepayment penalty calculator
percent of balance
POST /finance/mortgage-prepayment-penalty$0.002Developer Utilities
Reverse mortgage payout calculator
estimate proceeds
POST /finance/reverse-mortgage-estimate$0.002Developer Utilities
Four percent rule calculator
safe retirement withdrawal & nest egg
POST /finance/rule-of-4-percent$0.002Developer Utilities
Time-weighted return calculator
chain portfolio returns
POST /finance/time-weighted-return$0.002Developer Utilities
Yield to call calculator
calculate a callable bond's return
POST /finance/bond-yield-to-call$0.002Developer Utilities
Expense ratio return drag calculator
fee impact on fund returns
POST /finance/expense-ratio-drag$0.002Developer Utilities
Margin of safety price calculator
intrinsic value vs market
POST /finance/margin-of-safety-price$0.002Developer Utilities
PEG Ratio Calculator
Price/Earnings-to-Growth Ratio
POST /finance/peg-ratio$0.002Developer Utilities
Stock profit loss calculator
net P&L and percent return on a trade
POST /finance/stock-profit-loss$0.002Developer Utilities
Zero-coupon bond price calculator
PV from face, yield, years
POST /finance/zero-coupon-bond-price$0.002Developer Utilities
Bond convexity calculator
duration-adjusted price change estimate
POST /finance/bond-convexity$0.002Developer Utilities
Employer 401(k) match calculator
annual match from salary & formula
POST /finance/employer-match-value$0.002Developer Utilities
Retirement contribution gap calculator
POST /finance/retirement-contribution-gap$0.002Developer Utilities
Retirement savings by age calculator
salary-multiple benchmark, free
POST /finance/retirement-savings-by-age$0.002Developer Utilities
Required minimum distribution calculator
POST /finance/rmd-calculator$0.002Developer Utilities
Safe withdrawal rate calculator
test retirement sustainability
POST /finance/safe-withdrawal-rate-test$0.002Developer Utilities
Social Security benefit estimator
calculate PIA from AIME
POST /finance/social-security-estimate$0.002Developer Utilities
Double declining balance calculator
depreciation schedule
POST /finance/depreciation-double-declining$0.002Developer Utilities
Straight-line depreciation calculator
annual expense and book value
POST /finance/depreciation-straight-line$0.002Developer Utilities
Gross-up salary calculator
gross pay from target net income
POST /finance/gross-from-net-income$0.002Developer Utilities
Progressive income tax calculator
tax from brackets & taxable income
POST /finance/income-tax-brackets$0.002Developer Utilities
Take-home pay calculator
estimate your net paycheck
POST /finance/take-home-pay$0.002Developer Utilities
Tax deduction savings calculator
estimate the tax benefit
POST /finance/tax-deduction-savings$0.002Developer Utilities
Remove VAT calculator
find net price and VAT amount
POST /finance/vat-reverse$0.002Developer Utilities
Cash runway calculator
months left from balance and monthly burn
POST /finance/cash-runway$0.002Developer Utilities
Churn Rate Calculator
Customer or Revenue Churn
POST /finance/churn-rate$0.002Developer Utilities
Customer lifetime value calculator
CLV from AOV, margin, lifespan
POST /finance/customer-lifetime-value$0.002Developer Utilities
MRR Growth Rate Calculator
Monthly Recurring Revenue
POST /finance/mrr-growth$0.002Developer Utilities
Operating Margin Calculator
Calculate Operating Profit Margin
POST /finance/operating-margin$0.002Developer Utilities
Overtime and regular pay calculator
hourly rate, OT hours, gross pay
POST /finance/overtime-pay$0.002Developer Utilities
Selling price from markup calculator
cost plus markup to list price
POST /finance/selling-price-from-markup$0.002Developer Utilities
Units for target profit calculator
required sales quantity
POST /finance/units-for-target-profit$0.002Developer Utilities
Zero-Based Budget Calculator
Give Every Dollar a Job
POST /finance/budget-zero-based$0.002Developer Utilities
Degree of Financial Leverage Calculator
Measure Debt Sensitivity
POST /finance/financial-leverage$0.002Developer Utilities
GMROI calculator
gross margin return on inventory investment
POST /finance/gross-margin-return-on-inventory$0.002Developer Utilities
Interest coverage ratio calculator
operating income over interest expense
POST /finance/interest-coverage-ratio$0.002Developer Utilities
Internal Rate of Return Calculator
Estimate Project IRR
POST /finance/irr$0.002Developer Utilities
Quick Ratio Calculator
Measure Short-Term Liquidity
POST /finance/quick-ratio$0.002Developer Utilities
WACC calculator
weighted average cost of capital free online
POST /finance/wacc$0.002Developer Utilities
Credit card minimum payment calculator
payoff time and interest
POST /finance/credit-card-minimum-payment$0.002Developer Utilities
Debt snowball vs avalanche calculator
interest and payoff time
POST /finance/debt-snowball-vs-avalanche$0.002Developer Utilities
Inflation-adjusted value calculator
convert dollars between years
POST /finance/inflation-adjusted-value$0.002Developer Utilities
Net worth calculator
total your assets and liabilities
POST /finance/net-worth$0.002Developer Utilities
Price per unit calculator
compare weight, volume, or count
POST /finance/price-per-unit$0.002Developer Utilities
Raise percentage calculator
calculate your pay increase
POST /finance/raise-percentage$0.002Developer Utilities
Rent affordability calculator
estimate your monthly limit
POST /finance/rent-affordability$0.002Developer Utilities
Monthly savings for goal calculator
include interest
POST /finance/savings-goal-monthly$0.002Developer Utilities
Crypto Cost Basis Calculator
Average Cost Per Coin
POST /finance/crypto-cost-basis$0.002Developer Utilities
Crypto gas fee calculator
transaction cost in fiat
POST /finance/crypto-gas-fee-total$0.002Developer Utilities
Crypto Portfolio Allocation Calculator and Rebalancing Trades
POST /finance/crypto-portfolio-allocation$0.002Developer Utilities
Forex pip value calculator
pip worth from position size and rate
POST /finance/forex-pip-value$0.002Developer Utilities
Satoshi to Bitcoin converter
sats, BTC and fiat value
POST /finance/satoshi-to-btc$0.002