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
Uranium-lead radiometric age calculator
206Pb/238U dating free
POST /earth/radiometric-age-u-pb$0.002Developer Utilities
Refrigerant leak CO2 equivalent calculator
POST /earth/refrigerant-co2-equivalent$0.002Developer Utilities
Relative humidity from specific humidity
RH from q, T, P
POST /earth/relative-humidity-specific$0.002Developer Utilities
Richter magnitude from amplitude calculator
seismograph and distance
POST /earth/richter-from-amplitude$0.002Developer Utilities
Atmospheric scale height calculator
temperature, molar mass and gravity
POST /earth/scale-height$0.002Developer Utilities
Seawater density calculator from salinity, temperature and pressure
POST /earth/seawater-density$0.002Developer Utilities
Sediment compaction porosity calculator
exponential depth law
POST /earth/sediment-compaction$0.002Developer Utilities
Sediment Accumulation Rate Calculator
POST /earth/sedimentation-rate$0.002Developer Utilities
Radiation shielding half-value layer calculator
POST /earth/shielding-half-value-layer$0.002Developer Utilities
Significant wave height calculator
Hs from wave record
POST /earth/significant-wave-height$0.002Developer Utilities
Snow-to-liquid ratio calculator
snowfall from liquid precip
POST /earth/snow-to-liquid-ratio$0.002Developer Utilities
Solar panels needed for net zero
count from annual kWh and panel yield
POST /earth/solar-panel-breakeven-count$0.002Developer Utilities
Solar Panel Payback Period Calculator
POST /earth/solar-payback-period$0.002Developer Utilities
Solar panel power output calculator
PV watts from irradiance
POST /earth/solar-power-output$0.002Developer Utilities
Groundwater Specific Discharge Calculator
Darcy Flux and Velocity
POST /earth/specific-discharge$0.002Developer Utilities
Specific humidity to mixing ratio calculator
POST /earth/specific-humidity-to-mixing-ratio$0.002Developer Utilities
Tidal prism volume calculator
estuary water exchange
POST /earth/tidal-prism$0.002Developer Utilities
True wind from apparent wind calculator
TWS and direction free
POST /earth/true-wind-from-apparent$0.002Developer Utilities
Recycling CO2 savings calculator
avoided landfill emissions
POST /earth/waste-recycling-co2-savings$0.002Developer Utilities
Absolute water vapor density calculator
ρv from e and T (ideal gas)
POST /earth/water-vapor-density$0.002Developer Utilities
Ocean Wave Group Velocity Calculator
Wavelength and Depth
POST /earth/wave-group-velocity$0.002Developer Utilities
Deep-water wave celerity from period
phase speed c = gT/(2π)
POST /earth/wave-speed-from-period$0.002Developer Utilities
WBGT estimate from temperature and humidity calculator
POST /earth/wbgt-estimate$0.002Developer Utilities
Old wind chill calculator
Siple & Passel 1945 index
POST /earth/wind-chill-old$0.002Developer Utilities
Wind direction to 32-point compass calculator
POST /earth/wind-direction-to-compass-32$0.002Developer Utilities
Billable weight calculator
chargeable weight from actual vs dimensional
POST /ecom/billable-weight$0.002Developer Utilities
Boxes per pallet calculator
calculate layers and total boxes
POST /ecom/boxes-per-pallet$0.002Developer Utilities
Cash on delivery total calculator
goods + shipping + COD fee
POST /ecom/cod-total$0.002Developer Utilities
Shipping fuel surcharge calculator
freight total with fuel %
POST /ecom/fuel-surcharge$0.002Developer Utilities
Order handling fee calculator
fixed and percentage fees
POST /ecom/handling-fee$0.002Developer Utilities
Import Tax and VAT Estimate Calculator
POST /ecom/import-tax-estimate$0.002Developer Utilities
Pallet positions in container calculator
floor capacity and space left
POST /ecom/pallet-positions$0.002Developer Utilities
Pallet Stack Height Calculator
Cartons, Layers and Pallet Base
POST /ecom/pallet-stack-height$0.002Developer Utilities
Shipping cost by weight calculator
base charge plus weight rate
POST /ecom/shipping-cost-by-weight$0.002Developer Utilities
Shipping margin calculator
profit or loss per shipment
POST /ecom/shipping-margin$0.002Developer Utilities
Affordable bundle check calculator
test a two-good budget
POST /econ/affordable-bundle-check$0.002Developer Utilities
Average Product of Labor Calculator
Output per Worker
POST /econ/average-product-labor$0.002Developer Utilities
Average variable cost calculator
AVC = TVC / Q, free
POST /econ/average-variable-cost$0.002Developer Utilities
Cobb-Douglas production output calculator
Q = A·K^α·L^β
POST /econ/cobb-douglas-output$0.002Developer Utilities
Income CV calculator
scale-free inequality (σ/μ)
POST /econ/coefficient-of-variation-income$0.002Developer Utilities
Four-Firm Concentration Ratio Calculator
Calculate CR4
POST /econ/concentration-ratio-cr4$0.002Developer Utilities
Consumer Surplus Change Calculator
Price Change on Linear Demand
POST /econ/consumer-surplus-change-price$0.002Developer Utilities
Consumer price index from basket calculator
POST /econ/cpi-from-basket$0.002Developer Utilities
Cross exchange rate calculator
calculate rates through a common currency
POST /econ/cross-exchange-rate$0.002Developer Utilities
Current account balance calculator
trade + income + transfers
POST /econ/current-account-balance$0.002Developer Utilities
Deadweight Loss from a Price Floor Calculator
POST /econ/deadweight-loss-price-floor$0.002Developer Utilities
Economies of Scale Calculator
Compare Long-Run Average Cost
POST /econ/economies-of-scale-check$0.002Developer Utilities
Effective price after subsidy calculator
buyer net price free
POST /econ/effective-price-after-subsidy$0.002Developer Utilities
Market equilibrium from linear demand and supply
P* and Q*
POST /econ/equilibrium-from-demand-supply-functions$0.002Developer Utilities
Market Equilibrium with a Per-Unit Tax Calculator
POST /econ/equilibrium-with-tax$0.002Developer Utilities
Fixed cost calculator
FC = total cost − total variable cost
POST /econ/fixed-cost-from-total$0.002Developer Utilities
GDP deflator calculator
(nominal GDP / real GDP) × 100
POST /econ/gdp-deflator$0.002Developer Utilities
GDP Per Capita Growth Rate Calculator
POST /econ/gdp-per-capita-growth$0.002Developer Utilities
Giffen Good Check Calculator from Price and Quantity Data
POST /econ/giffen-good-check$0.002Developer Utilities
HDI Education Index Calculator
Mean and Expected Schooling
POST /econ/hdi-education-index$0.002Developer Utilities
HHI market concentration classification
competitive, moderate, high
POST /econ/hhi-market-classification$0.002Developer Utilities
Import Expenditure Calculator
Price × Quantity
POST /econ/import-expenditure$0.002Developer Utilities
Laffer Curve Tax Revenue Calculator
Find the Peak Tax Rate
POST /econ/laffer-curve-revenue$0.002Developer Utilities
Lerner index calculator
market power (P−MC)/P
POST /econ/lerner-index$0.002Developer Utilities
Loss-Minimizing Output Calculator
Produce or Shut Down
POST /econ/loss-minimizing-output$0.002