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
DNA helical turns calculator from base pairs
POST /bio/dna-helical-turns$0.002Developer Utilities
Dry matter intake calculator
fresh feed weight and DM percentage
POST /bio/dry-matter-intake$0.002Developer Utilities
dsDNA mass to molar concentration calculator
ng/µL to nM
POST /bio/dsdna-mass-to-molar$0.002Developer Utilities
dsDNA ng/µL calculator from A260 absorbance
POST /bio/dsdna-ng-per-ul$0.002Developer Utilities
Egg Incubation Hatch Date Calculator by Bird Species
POST /bio/egg-incubation-hatch-date$0.002Developer Utilities
Fertilizer NPK rate per hectare calculator
POST /bio/fertilizer-npk-rate$0.002Developer Utilities
Fish stocking density calculator
pond fish count from area or volume
POST /bio/fish-stocking-density$0.002Developer Utilities
Forage allowance calculator
available forage per unit animal live weight
POST /bio/forage-allowance$0.002Developer Utilities
Bacterial Generation Time Calculator
POST /bio/generation-time$0.002Developer Utilities
Crop harvest index calculator
economic yield ÷ above-ground biomass
POST /bio/harvest-index$0.002Developer Utilities
Home range density calculator
animals per occupied area
POST /bio/home-range-density$0.002Developer Utilities
Importance value index calculator for plant species
POST /bio/importance-value-index$0.002Developer Utilities
Irrigation run time calculator
water depth, flow rate, and area
POST /bio/irrigation-time$0.002Developer Utilities
Life Table Survivorship Calculator
Calculate Age-Specific Survivorship
POST /bio/life-table-survivorship$0.002Developer Utilities
Lime requirement calculator
agricultural lime from buffer pH and area
POST /bio/lime-requirement$0.002Developer Utilities
Livestock daily water requirement
herd water by head count
POST /bio/livestock-water-requirement$0.002Developer Utilities
Additive Map Distance Calculator with Double Crossover Correction
POST /bio/map-units-additive$0.002Developer Utilities
Molar absorptivity calculator
Beer-Lambert extinction coefficient
POST /bio/molar-absorptivity$0.002Developer Utilities
Most probable number (MPN)
density from positive tubes
POST /bio/most-probable-number$0.002Developer Utilities
DNA Nanograms to Copies Calculator by Base-Pair Length
POST /bio/ng-to-copies-dna$0.002Developer Utilities
DNA concentration from A260 calculator for DNA and RNA
POST /bio/nucleic-acid-concentration-a260$0.002Developer Utilities
OD600 to CFU calculator
viable cells/mL from optical density
POST /bio/od-to-cfu$0.002Developer Utilities
Oligo nmol to µg calculator
mass from base composition MW
POST /bio/oligo-nmol-to-ug$0.002Developer Utilities
Pasture carrying capacity calculator
POST /bio/pasture-carrying-capacity$0.002Developer Utilities
Pedigree combined probability calculator
offspring genotype risk
POST /bio/pedigree-probability-combined$0.002Developer Utilities
Petersen–Chapman population estimate
bias-adjusted mark–recapture
POST /bio/petersen-chapman-adjusted$0.002Developer Utilities
Pond Fish Biomass Calculator
Total Stock Weight
POST /bio/pond-fish-biomass$0.002Developer Utilities
Population density calculator for habitat area or volume
POST /bio/population-density$0.002Developer Utilities
Population Exponential Growth Calculator
POST /bio/population-exponential-growth$0.002Developer Utilities
Population percent change calculator
census growth or decline
POST /bio/population-percent-change$0.002Developer Utilities
PPM solution preparation calculator
solute mass needed
POST /bio/ppm-solution-prep$0.002Developer Utilities
Probability all offspring are the same sex calculator
POST /bio/probability-all-offspring-same-sex$0.002Developer Utilities
Protein net charge calculator
estimate peptide charge at any pH
POST /bio/protein-net-charge$0.002Developer Utilities
Probability of two recessive traits
dihybrid Punnett calculator
POST /bio/punnett-probability-two-recessive$0.002Developer Utilities
Protein purification calculator
recovery and purification fold
POST /bio/purification-recovery-fold$0.002Developer Utilities
Recombination Frequency Calculator for Two-Point Crosses
POST /bio/recombination-frequency$0.002Developer Utilities
Rule of 70 Population Calculator
Estimate Doubling Time
POST /bio/rule-of-70-population$0.002Developer Utilities
Secondary Production Calculator for Population Biomass
POST /bio/secondary-production$0.002Developer Utilities
Seeding rate from spacing calculator
seeds per hectare
POST /bio/seeding-rate-from-spacing$0.002Developer Utilities
Simpson index calculator
species dominance and diversity from abundances
POST /bio/simpson-index-ecology$0.002Developer Utilities
Single-tube dilution factor calculator
sample and final volume
POST /bio/single-tube-dilution-factor$0.002Developer Utilities
Species Richness Count Calculator
POST /bio/species-richness$0.002Developer Utilities
Specific growth rate mu calculator
microbial log-phase growth
POST /bio/specific-growth-rate-mu$0.002Developer Utilities
Thermal z-value calculator
temperature change for one log D
POST /bio/thermal-z-value$0.002Developer Utilities
Total Row Length Calculator
POST /bio/total-row-length$0.002Developer Utilities
Trophic energy transfer calculator
10% ecological efficiency rule
POST /bio/trophic-energy-transfer$0.002Developer Utilities
Two-trait combined probability calculator
inherited traits
POST /bio/two-trait-combined-probability$0.002Developer Utilities
Weaning Weight Ratio Calculator for Contemporary Groups
POST /bio/weaning-weight-ratio$0.002Developer Utilities
Y-Linked Inheritance Probability Calculator for Sons and Daughters
POST /bio/y-linked-inheritance$0.002Developer Utilities
Agenda end time calculator
find when your meeting finishes
POST /biz/agenda-end-time$0.002Developer Utilities
Attendee hourly cost calculator
salary plus overhead
POST /biz/attendee-hourly-cost$0.002Developer Utilities
Backlog completion sprint count calculator
POST /biz/backlog-completion-sprints$0.002Developer Utilities
Context switching time loss calculator
minutes lost to interruptions
POST /biz/context-switch-loss$0.002Developer Utilities
Eat the frog order
sort tasks hardest first free
POST /biz/eat-the-frog-order$0.002Developer Utilities
Eisenhower priority classifier
do, schedule, delegate, or delete
POST /biz/eisenhower-classify$0.002Developer Utilities
FTE headcount calculator
full-time equivalent from weekly hours
POST /biz/fte-headcount$0.002Developer Utilities
Gantt chart bar duration calculator
calendar or working days
POST /biz/gantt-bar-duration$0.002Developer Utilities
Goal completion date calculator
finish date from daily progress rate
POST /biz/goal-completion-date$0.002Developer Utilities
66-Day Habit Target Date Calculator
POST /biz/habit-66-days$0.002Developer Utilities
Inbox zero processing time calculator
POST /biz/inbox-zero-time$0.002