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
Remote vs on-location workers
commute and salary savings
POST /fin/remote-vs-on-location-workers$0.002Developer Utilities
Rent calculator
affordable monthly rent from income
POST /fin/rent$0.002Developer Utilities
Rent increase calculator
new rent from current rent and a percent
POST /fin/rent-increase$0.002Developer Utilities
Residual income calculator
NOI minus required return on capital
POST /fin/residual-income$0.002Developer Utilities
Retained earnings calculator
ending RE from NI and dividends
POST /fin/retained-earnings$0.002Developer Utilities
Retention ratio calculator
earnings kept after dividends
POST /fin/retention-ratio$0.002Developer Utilities
Revenue calculator
total from units sold times price per unit
POST /fin/revenue$0.002Developer Utilities
Revenue growth calculator
percent change vs previous period
POST /fin/revenue-growth$0.002Developer Utilities
Revenue per employee calculator
RPE from revenue and headcount, free
POST /fin/revenue-per-employee$0.002Developer Utilities
ROA calculator
return on assets from net income and total assets
POST /fin/roa$0.002Developer Utilities
ROAS calculator
return on ad spend from revenue, free
POST /fin/roas$0.002Developer Utilities
ROIC calculator
return on invested capital from NOPAT, free
POST /fin/roic$0.002Developer Utilities
Roth IRA calculator
tax-free future value of contributions
POST /fin/roth-ira$0.002Developer Utilities
RSI calculator
relative strength index from closing prices
POST /fin/rsi$0.002Developer Utilities
RV loan calculator
monthly payment from principal, rate, and term
POST /fin/rv-loan$0.002Developer Utilities
SaaS metrics calculator
MRR, churn rate and customer LTV
POST /fin/saas-metrics$0.002Developer Utilities
Safety stock calculator
max vs average usage and lead time
POST /fin/safety-stock$0.002Developer Utilities
Salary inflation calculator
inflation-adjusted future pay
POST /fin/salary-inflation$0.002Developer Utilities
Sales calculator
tax amount and total from rate, free
POST /fin/sales$0.002Developer Utilities
Sales commission calculator
total from amount, rate, bonus
POST /fin/sales-commission$0.002Developer Utilities
Savings calculator
final balance from deposit, contribution, rate
POST /fin/savings$0.002Developer Utilities
Savings plan calculator
future value of monthly deposits
POST /fin/savings-plan$0.002Developer Utilities
Savings withdrawal calculator
months until a balance depletes
POST /fin/savings-withdrawal$0.002Developer Utilities
Scrap gold calculator
weight, karats and price per gram
POST /fin/scrap-gold$0.002Developer Utilities
UK SDLT calculator
stamp duty from price, buyer type, first-time status
POST /fin/sdlt-uk$0.002Developer Utilities
Second stimulus check calculator
amount from AGI and dependents
POST /fin/second-stimulus-check$0.002Developer Utilities
Semi-monthly pay calculator
annual salary to paycheck
POST /fin/semi-monthly-pay$0.002Developer Utilities
Simple mortgage calculator
monthly payment from principal, rate, term
POST /fin/simple-mortgage$0.002Developer Utilities
Simple savings calculator
future balance from deposit, rate, years
POST /fin/simple-savings$0.002Developer Utilities
SIP India calculator
maturity from monthly SIP, rate and years
POST /fin/sip-india$0.002Developer Utilities
Software contract value calculator
TCV from monthly fee
POST /fin/software-contract-value$0.002Developer Utilities
Spending multiplier calculator
ΔY = spending × 1/(1−MPC)
POST /fin/spending-multiplier$0.002Developer Utilities
SSY calculator
Sukanya Samriddhi Yojana maturity amount
POST /fin/ssy$0.002Developer Utilities
State income tax calculator
brackets, tax owed, effective rate
POST /fin/state-tax$0.002Developer Utilities
HEALS Act stimulus check calculator
estimated payment
POST /fin/stimulus-check-heals$0.002Developer Utilities
HEALS vs HEROES stimulus calculator
compare 2020 rebate checks
POST /fin/stimulus-heals-vs-heroes$0.002Developer Utilities
Stock profit calculator
net gain and return after fees
POST /fin/stock$0.002Developer Utilities
Stock average calculator
weighted average cost per share, free
POST /fin/stock-average$0.002Developer Utilities
Stock split calculator
new shares and price from split ratio
POST /fin/stock-split$0.002Developer Utilities
Student loan forgiveness calculator
remaining IDR balance
POST /fin/student-loan-forgiveness$0.002Developer Utilities
Subscription waste calculator
unused subscriptions yearly waste
POST /fin/subscription-waste$0.002Developer Utilities
Sustainable growth rate calculator
SGR from ROE and retention
POST /fin/sustainable-growth-rate$0.002Developer Utilities
Tax bracket calculator
which bracket, marginal rate, tax owed
POST /fin/tax-bracket$0.002Developer Utilities
TDS on interest calculator
deducted tax and net interest, free
POST /fin/tds-interest$0.002Developer Utilities
Tenure calculator
years, months and days between two dates
POST /fin/tenure$0.002Developer Utilities
Texas sales tax calculator
combined rate, tax and total
POST /fin/texas-tax$0.002Developer Utilities
Time and a half calculator
overtime at 1.5x hourly wage
POST /fin/time-and-a-half$0.002Developer Utilities
Time value of money calculator
present or future value
POST /fin/time-value-of-money$0.002Developer Utilities
Treynor ratio calculator
excess return per unit of beta
POST /fin/treynor-ratio$0.002Developer Utilities
Triple discount calculator
three successive % off, final price
POST /fin/triple-discount$0.002Developer Utilities
TRIR calculator
compounded annualized return from periodic returns
POST /fin/trir$0.002Developer Utilities
Trump tariff calculator
import duty and landed cost
POST /fin/trump-tariff$0.002Developer Utilities
Trump tax calculator
2017 TCJA brackets, tax owed
POST /fin/trump-tax$0.002Developer Utilities
TTM calculator
trailing twelve months from four quarterly values
POST /fin/ttm-trailing-twelve-months$0.002Developer Utilities
UK coin weight calculator
grams from each denomination
POST /fin/uk-coin-weight$0.002Developer Utilities
UK take-home pay calculator
net from gross, tax code, pension
POST /fin/uk-take-home-pay$0.002Developer Utilities
Unemployment benefit HEALS calculator
weekly amount from prior wages
POST /fin/unemployment-benefit-heals$0.002Developer Utilities
Unlevered free cash flow calculator
UFCF from EBIT, CapEx
POST /fin/unlevered-free-cash-flow$0.002Developer Utilities
US income percentile calculator
household rank from annual pay
POST /fin/us-income-percentile$0.002Developer Utilities
VA disability combined rating calculator
official VA rounding
POST /fin/va-disability$0.002