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
Vegan footprint calculator
annual carbon, water and land savings
POST /eco/vegan-footprint$0.002Developer Utilities
Water demand calculator
daily and annual liters from population
POST /eco/water-demand$0.002Developer Utilities
Wind turbine profit calculator
yearly profit from rotor and wind
POST /eco/wind-turbine-profit$0.002Developer Utilities
Zero-waste Christmas tree calculator
kg CO2 avoided
POST /eco/zero-waste-christmas-tree$0.002Developer Utilities
Auto loan calculator
monthly payment, total interest, amortization
POST /fin/auto-loan$0.002Developer Utilities
Average collection period calculator
days sales outstanding
POST /fin/average-collection$0.002Developer Utilities
Balance transfer calculator
net savings vs staying put
POST /fin/balance-transfer$0.002Developer Utilities
Balloon payment calculator
remaining lump sum due at maturity
POST /fin/balloon-payment$0.002Developer Utilities
Bank reconciliation calculator
adjusted balance and difference
POST /fin/bank-reconciliation$0.002Developer Utilities
Bi-weekly mortgage payment calculator
payment and total interest
POST /fin/bi-weekly-mortgage-payment$0.002Developer Utilities
Biden tax plan calculator
federal tax vs prior brackets
POST /fin/biden-tax-plan$0.002Developer Utilities
Bike EMI calculator
two-wheeler equated monthly installment
POST /fin/bike-emi$0.002Developer Utilities
Bill rate calculator
hourly rate from costs, hours, and margin
POST /fin/bill-rate$0.002Developer Utilities
Bitcoin ETF calculator
holding value, gain and return
POST /fin/bitcoin-etf$0.002Developer Utilities
Biweekly pay calculator
gross paycheck from salary or hourly
POST /fin/biweekly-pay$0.002Developer Utilities
Black-Scholes calculator
European call and put option price
POST /fin/black-scholes$0.002Developer Utilities
Blended rate calculator
weighted average interest across loans
POST /fin/blended-rate$0.002Developer Utilities
Bond yield calculator
yield to maturity from price and coupon
POST /fin/bond-yield$0.002Developer Utilities
Bond YTM calculator
yield to maturity from price
POST /fin/bond-ytm$0.002Developer Utilities
Bounce rate calculator
website bounce rate from sessions
POST /fin/bounce-rate$0.002Developer Utilities
GBP rate change impact
sterling difference on a foreign amount
POST /fin/brexit$0.002Developer Utilities
Budget calculator
remaining surplus or deficit from income
POST /fin/budget$0.002Developer Utilities
Build or buy software calculator
in-house vs subscription
POST /fin/build-or-buy$0.002Developer Utilities
Burndown chart calculator
ideal remaining story points
POST /fin/burndown-chart$0.002Developer Utilities
Business loan calculator
monthly payment and total repayment
POST /fin/business-loan$0.002Developer Utilities
Business valuation calculator
earnings times industry multiple
POST /fin/business-valuation$0.002Developer Utilities
Buying power calculator
inflation-adjusted value of money
POST /fin/buying-power$0.002Developer Utilities
California overtime calculator
daily, weekly, and double-time
POST /fin/california-overtime$0.002Developer Utilities
California sales tax calculator
7.25% statewide base, tax and total
POST /fin/california-sales-tax$0.002Developer Utilities
California income tax calculator
2025 brackets, tax owed
POST /fin/california-tax$0.002Developer Utilities
Call put option calculator
expiry payoff and net profit
POST /fin/call-put-option$0.002Developer Utilities
Cap rate calculator
capitalization rate from NOI and value
POST /fin/cap-rate$0.002Developer Utilities
CAPM calculator
expected return from beta and market premium
POST /fin/capm$0.002Developer Utilities
Car lease calculator
monthly payment from price and money factor
POST /fin/car-lease$0.002Developer Utilities
Car loan EMI calculator
monthly installment and total interest
POST /fin/car-loan-emi$0.002Developer Utilities
Car refinance calculator
monthly and total savings from a lower rate
POST /fin/car-refinance$0.002Developer Utilities
Carried interest calculator
manager share of fund profits
POST /fin/carried-interest$0.002Developer Utilities
CARES Act 2020 rebate calculator
credit from AGI and dependents
POST /fin/cash-act-2020$0.002Developer Utilities
Cash back calculator
earned amount from spend and percent
POST /fin/cash-back$0.002Developer Utilities
CD calculator
certificate of deposit maturity and interest
POST /fin/cd$0.002Developer Utilities
Cell phone plan calculator
monthly cost from base, rate, GB
POST /fin/cell-phone-plan$0.002Developer Utilities
CLTV calculator
combined loan-to-value from all liens
POST /fin/cltv$0.002Developer Utilities
Cobb-Douglas production function
output from capital and labor
POST /fin/cobb-douglas-production-function$0.002Developer Utilities
Combined ratio calculator
loss ratio plus expense ratio
POST /fin/combined-ratio$0.002Developer Utilities
Commercial lease calculator
total cost from rent, term, extras
POST /fin/commercial-lease$0.002Developer Utilities
Comparative advantage calculator
opportunity costs of two goods
POST /fin/comparative-advantage$0.002Developer Utilities
Compound growth calculator
future value from rate and periods
POST /fin/compound-growth$0.002Developer Utilities
Compound interest calculator
final balance and interest
POST /fin/compound-interest$0.002Developer Utilities
Compound interest rate calculator
implied annual rate from growth
POST /fin/compound-interest-rate$0.002Developer Utilities
Consulting fees calculator
hourly rate, hours and retainer
POST /fin/consulting-fees$0.002Developer Utilities
Consumer surplus calculator
willingness to pay minus price
POST /fin/consumer-surplus$0.002Developer Utilities
Continuous compound calculator
final amount and interest
POST /fin/continuous-compound$0.002Developer Utilities
Cost of capital calculator
WACC from equity, debt and tax
POST /fin/cost-of-capital$0.002Developer Utilities
Cost of doing business calculator
total cost and cost per unit
POST /fin/cost-of-doing-business$0.002Developer Utilities
Cost of equity calculator
CAPM from beta and market return
POST /fin/cost-of-equity$0.002Developer Utilities
Coupon payment calculator
periodic amount from face and rate
POST /fin/coupon-payment$0.002Developer Utilities
Coupon rate calculator
bond coupon from annual payment and par
POST /fin/coupon-rate$0.002Developer Utilities
CPA calculator
cost per acquisition from ad spend, free
POST /fin/cpa$0.002Developer Utilities
CPC CPM calculator
cost per click and cost per mille
POST /fin/cpc-cpm$0.002Developer Utilities
CPI inflation calculator
percent change from two CPI values
POST /fin/cpi-inflation$0.002