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
Debt yield calculator
free
POST /finance/debt-yield$0.002Developer Utilities
50% rule operating expense estimate
free
POST /finance/fifty-percent-rule$0.002Developer Utilities
Gross rent multiplier (GRM)
free
POST /finance/gross-rent-multiplier$0.002Developer Utilities
Rule of 72 doubling time
free
POST /finance/rule-of-72$0.002Developer Utilities
Andoyer–Lambert distance
free
POST /geo/andoyer$0.002Developer Utilities
Hammer projection calculator
free
POST /geo/hammer$0.002Developer Utilities
Horizontal sextant angle distance
free
POST /geo/horizontal-sextant-angle$0.002Developer Utilities
Polaris latitude calculator
free
POST /geo/polaris-latitude$0.002Developer Utilities
Basic proportionality (Thales)
free
POST /math/basic-proportionality$0.002Developer Utilities
Isosceles trapezoid calculator
free
POST /math/isosceles-trapezoid$0.002Developer Utilities
German number to words
free
POST /math/number-to-words-de$0.002Developer Utilities
Italian number to words
free
POST /math/number-to-words-it$0.002Developer Utilities
Portuguese number to words
free
POST /math/number-to-words-pt$0.002Developer Utilities
Oblique cone volume calculator
free
POST /math/oblique-cone$0.002Developer Utilities
German ordinal words
free
POST /math/ordinal-words-de$0.002Developer Utilities
Prolate spheroid calculator
free
POST /math/prolate-spheroid$0.002Developer Utilities
Ptolemy theorem calculator
free
POST /math/ptolemy-theorem$0.002Developer Utilities
Spherical law of cosines
free
POST /math/spherical-law-of-cosines$0.002Developer Utilities
French words to number
free
POST /math/words-to-number-fr$0.002Developer Utilities
Fréchet distribution calculator
free
POST /stat/frechet-dist$0.002Developer Utilities
3D distance calculator
Euclidean distance between two points in space
POST /math/distance-3d$0.002Developer Utilities
Calculate baseball batting average
hits over at-bats, three decimals
POST /sports/batting-average-calc$0.002Developer Utilities
Basketball plus-minus calculator
on-court point differential
POST /sports/plus-minus-calculate$0.002Developer Utilities
Calculate team win percentage
wins, losses and ties, ties as half-wins
POST /sports/win-percentage-calc$0.002Developer Utilities
Hair color lift estimator
levels to lift and whether bleach is needed
POST /beauty/hair-color-level-lift$0.002Developer Utilities
Hair porosity estimate from a float test result
POST /beauty/hair-porosity-estimate$0.002Developer Utilities
Piercing healing timeline calculator
estimate your current stage
POST /beauty/piercing-healing-timeline$0.002Developer Utilities
Sunscreen reapplication schedule
exact times to reapply SPF
POST /beauty/spf-reapply-schedule$0.002Developer Utilities
Golf Stroke Play Score to Par Calculator
POST /sports/golf-stroke-play-score$0.002Developer Utilities
Cricket run rate calculator
current and required rates
POST /sports/run-rate-cricket-calc$0.002Developer Utilities
Calculate CAC to LTV ratio
check the 3:1 benchmark
POST /biz/cac-ltv-ratio$0.002Developer Utilities
Calculate Total Employee Cost from Salary and Overhead
POST /biz/employee-cost-total$0.002Developer Utilities
Calculate profit margin percentage
gross profit and margin
POST /biz/profit-margin-calc$0.002Developer Utilities
PTO accrual balance calculator
accrued leave with policy cap
POST /biz/pto-accrual-calc$0.002Developer Utilities
Return on ad spend calculator
ROAS ratio and percent free
POST /biz/ad-spend-roas-calc$0.002Developer Utilities
Competitor price positioning calculator
percentile and average
POST /biz/competitor-price-position$0.002Developer Utilities
Economic order quantity calculator
EOQ formula online
POST /biz/eoq-calculate$0.002Developer Utilities
Founder equity dilution calculator
post-round ownership %
POST /biz/equity-dilution-calc$0.002Developer Utilities
TAM, SAM and SOM Calculator
Estimate Your Market Size
POST /biz/market-size-estimate$0.002Developer Utilities
Net present value calculator for cash flows
POST /biz/npv-calculate$0.002Developer Utilities
Subscription customer LTV calculator
ARPU, margin, churn
POST /biz/subscription-ltv-calc$0.002Developer Utilities
Email campaign open rate calculator
delivery and open percentages
POST /biz/email-open-rate-calc$0.002Developer Utilities
Mortgage escrow monthly reserve calculator
tax and insurance
POST /realestate/escrow-monthly-reserve-calc$0.002Developer Utilities
Check rental application income-to-rent ratio
POST /realestate/rental-application-income-ratio$0.002Developer Utilities
Security deposit limit calculator
check a proposed deposit
POST /realestate/security-deposit-max-check$0.002Developer Utilities
Multi-agent real estate commission split
brokerage, referral, agent net
POST /realestate/commission-split-multi-agent$0.002Developer Utilities
Generate a move-in condition walkthrough checklist
POST /realestate/moving-in-walkthrough-checklist$0.002Developer Utilities
Property Management Fee Calculator
Fees and Owner Net Income
POST /realestate/property-management-fee-calc$0.002Developer Utilities
Rent split calculator by room size
divide rent fairly
POST /realestate/subletting-rent-split-calc$0.002Developer Utilities
New home utility setup checklist
lead times before move-in
POST /realestate/utility-setup-checklist-new-home$0.002Developer Utilities
Customs duty estimate from declared value and category rate
POST /ecom/customs-duty-estimate$0.002Developer Utilities
Freight class from density
NMFC band from weight and cubic volume
POST /ecom/freight-class-weight-density$0.002Developer Utilities
Boxes per pallet calculator
estimate stacking layout
POST /ecom/pallet-stacking-count-estimate$0.002Developer Utilities
Warehouse storage slot utilization calculator
capacity threshold
POST /ecom/warehouse-slot-utilization-calc$0.002Developer Utilities
Check whether an address is within a delivery zone radius
POST /ecom/last-mile-delivery-zone-check$0.002Developer Utilities
Pick and pack time estimate
order items × pick time + packing
POST /ecom/pick-pack-time-estimate$0.002Developer Utilities
Calculate parking fee by duration
hourly rate and daily maximum
POST /travel/parking-fee-duration-calc$0.002Developer Utilities
Multi-stop route total distance calculator
POST /travel/route-stop-sequence-distance$0.002Developer Utilities
Bike share trip cost calculator
unlock fee, minutes and member allowance
POST /travel/bike-share-trip-cost-calc$0.002Developer Utilities
Calculate EV charging session cost from kWh, rate, and fees
POST /travel/ev-charging-cost-estimate$0.002