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
Valve flow coefficient calculator
Cv from GPM, ΔP and G
POST /phys/valve-flow-coefficient$0.002Developer Utilities
Velocity calculator
average v = d/t in metres per second
POST /phys/velocity$0.002Developer Utilities
Vickers hardness number calculator
HV from force and diagonal
POST /phys/vickers-hardness-number$0.002Developer Utilities
Voltage regulation calculator
% from no-load and full-load V
POST /phys/voltage-regulation$0.002Developer Utilities
Volume to density calculator
ρ=m/V from mass and volume
POST /phys/volume-to-density$0.002Developer Utilities
Pokemon GO egg hatch calculator
remaining km to hatch
POST /health/pokemon-go$0.002Developer Utilities
Plasma osmolality calculator
Na, glucose, BUN, ethanol
POST /health/plasma-osmolality$0.002Developer Utilities
Plasma volume
Nadler from weight, height, sex, hematocrit
POST /health/plasma-volume$0.002Developer Utilities
Positive pregnancy test
hCG vs kit sensitivity, free
POST /health/positive-pregnancy-test$0.002Developer Utilities
Pregnancy due date calculator
Naegele from LMP and cycle
POST /health/pregnancy-due-date$0.002Developer Utilities
Pregnancy test calculator
hCG and DPO probability, free
POST /health/pregnancy-test$0.002Developer Utilities
Pregnancy test at 3 weeks
hCG range and home test odds
POST /health/pregnancy-test-at-3-weeks$0.002Developer Utilities
Prescription refill calculator
days supply and next refill date
POST /health/prescription-refill$0.002Developer Utilities
Protein deficit calculator
grams needed from current, target, and weight
POST /health/protein$0.002Developer Utilities
Protein-creatinine ratio calculator
spot urine PCR category
POST /health/protein-cr-ratio$0.002Developer Utilities
PSA density calculator
serum PSA / ultrasound volume, free
POST /health/psa-density$0.002Developer Utilities
PSA doubling time calculator
PSADT in months from two PSA values
POST /health/psa-doubling-time$0.002Developer Utilities
PSI calculator
Pneumonia Severity Index score and risk class
POST /health/psi$0.002Developer Utilities
PVR calculator
post-void residual ratio and voiding efficiency
POST /health/pvr$0.002Developer Utilities
Qp/Qs ratio calculator
pulmonary to systemic flow from O2 sat
POST /health/qp-qs-ratio$0.002Developer Utilities
qSOFA calculator
quick sepsis score from RR, SBP, AMS
POST /health/q-sofa$0.002Developer Utilities
QTc calculator
Bazett corrected QT interval from QT and HR
POST /health/qtc$0.002Developer Utilities
Quarantine activity calculator
exposure date to release date
POST /health/quarantine-activity$0.002Developer Utilities
Radiation dose calculator
effective dose in Sv from Gy, free
POST /health/radiation-dose$0.002Developer Utilities
RBC indices calculator
MCV, MCH and MCHC from CBC, free
POST /health/rbc-indices$0.002Developer Utilities
RCRI calculator
Revised Cardiac Risk Index score and class
POST /health/rcri$0.002Developer Utilities
Relative fat mass calculator
body fat % from height, waist, sex
POST /health/relative-fat-mass$0.002Developer Utilities
REM sleep calculator
REM minutes and cycle count from duration
POST /health/rem-sleep$0.002Developer Utilities
Corrected reticulocyte count
CRC from percent and hematocrit
POST /health/reticulocyte-count$0.002Developer Utilities
Reverse due date calculator
conception date from EDD, free
POST /health/reverse-due-date$0.002Developer Utilities
Revised Geneva score
PE probability from heart rate and risks
POST /health/revised-geneva-score$0.002Developer Utilities
Revised Trauma Score calculator
GCS, SBP, RR weighted RTS
POST /health/revised-trauma-score$0.002Developer Utilities
Type 2 diabetes risk score
FINDRISC points and category, free
POST /health/risk-dm$0.002Developer Utilities
RSBI calculator
rapid shallow breathing index (f/VT)
POST /health/rsbi$0.002Developer Utilities
RMR calculator
Mifflin-St Jeor resting metabolic rate (kcal/day)
POST /health/rmr$0.002Developer Utilities
SAAG calculator
serum-ascites albumin gradient, free
POST /health/saag$0.002Developer Utilities
SAPS II calculator
ICU severity score and hospital mortality
POST /health/saps-ii$0.002Developer Utilities
SCORAD calculator
atopic dermatitis severity index, free
POST /health/scorad$0.002Developer Utilities
Sepsis screen - SIRS plus mentation criteria and flag, free
POST /health/sepsis$0.002Developer Utilities
Simple daily calorie intake
weight, height, age, sex, activity
POST /health/simple-calorie-intake$0.002Developer Utilities
Skinfold body fat calculator
Jackson-Pollock 7-site, age, sex
POST /health/skinfold-body-fat$0.002Developer Utilities
Sleep cycle calculator
bedtimes from wake time by 90-minute cycles
POST /health/sleep-cycle$0.002Developer Utilities
Sleep time calculator
90-minute cycle bedtimes and wake times
POST /health/sleep-time$0.002Developer Utilities
Smoking recovery
lung cancer risk drop after quitting, free
POST /health/smoking-recovery$0.002Developer Utilities
SNAP-II neonatal score
first-12-hour illness severity, free
POST /health/snap-score$0.002Developer Utilities
Sobriety calculator
years, months and days sober
POST /health/sobriety$0.002Developer Utilities
Social distancing calculator
max occupancy from room area
POST /health/social-distancing$0.002Developer Utilities
Sodium change calculator
expected Na change per liter of infusate
POST /health/sodium-change$0.002Developer Utilities
Corrected sodium calculator
hyperglycemia Katz/Hillier, free
POST /health/sodium-correction$0.002Developer Utilities
Sodium correction rate calculator
mEq/L per hour from Na and duration
POST /health/sodium-correction-rate$0.002Developer Utilities
Sodium deficit calculator
total body Na deficit in mEq
POST /health/sodium-deficit$0.002Developer Utilities
Sodium in salt calculator
milligrams from mass and fraction
POST /health/sodium-in-salt$0.002Developer Utilities
SOFA score calculator
Sequential Organ Failure Assessment 0–24
POST /health/sofa-score$0.002Developer Utilities
Sperm analysis calculator
WHO 2021 semen reference limits
POST /health/sperm-analysis$0.002Developer Utilities
Standard drink calculator
volume, ABV and country, free
POST /health/standard-drink$0.002Developer Utilities
Corticosteroid converter
equivalent steroid dose in milligrams
POST /health/steroid$0.002Developer Utilities
Stillbirth risk calculator
remaining risk from weeks and factors
POST /health/stillbirth-risk$0.002Developer Utilities
STOP-BANG calculator
OSA risk score from 8 yes/no answers
POST /health/stop-bang$0.002Developer Utilities
Stroke volume calculator
EDV minus ESV in milliliters, free
POST /health/stroke-volume$0.002Developer Utilities
Sugar intake calculator
max added sugar grams from calories, free
POST /health/sugar-intake$0.002