🧮Calculators
Calculators cover finance, health, math, physics, engineering and everyday life: interest and loans, net salary, BMI, rule of three, conversions and more. Results are informational and educational — for important decisions, confirm with a professional and official sources.
2826 tools
Kerala Onam India Date
Computes approximate Onam festival date in Kerala India.
India Raksha Bandhan Date
Computes approximate Raksha Bandhan date in India.
Islamic Eid al Fitr Date
Computes approximate Eid al Fitr date in Gregorian calendar.
Scrum Team Velocity Points per Sprint
Computes average Scrum team velocity in story points per sprint from three recent sprints.
Project Burndown Remaining Points Days
Estimates days remaining to burn down from remaining points and team daily velocity.
Kanban Cycle Time Average Days
Computes average Kanban cycle time by dividing days worked by tasks completed.
Kanban Lead Time Average Days
Estimates average Kanban lead time by summing queue time and cycle time per task.
Kanban WIP Limit People
Computes a recommended WIP limit on a Kanban board from team size.
Cumulative Flow Work Type Days
Estimates average days in a CFD stage from items and entry rate.
Spike Investigation Time Points
Estimates a research spike duration in hours from points and hours per point.
Backlog Refinement Time Hours
Computes total backlog refinement hours from number of items and average time per item.
Sprint Retrospective Time Min
Computes recommended sprint retrospective duration in minutes based on team size and sprint length.
Sprint Planning Time Hours
Computes sprint planning duration in hours based on sprint length per Scrum guide.
Daily Standup per Person Min
Estimates recommended daily standup minutes summing speaking time per team member, capped at 15.
Sprint Review Time Min
Computes recommended sprint review duration in minutes from sprint length per Scrum guide.
T-shirt Fabric Person Size cm
Estimates centimeters of fabric needed for a t-shirt from body height and width.
Pants Fabric Person Length cm
Estimates fabric centimeters needed for pants from length and waist.
Skirt Fabric Person Height cm
Estimates centimeters of fabric for a skirt from desired length and hip.
Dress Fabric Person Height cm
Estimates centimeters of fabric for a dress from garment height and fabric width.
Blouse Fabric Person Size cm
Estimates centimeters of fabric for a blouse from bust girth and length.
Jacket Fabric Person Size cm
Estimates centimeters of fabric for a jacket from chest and body length.
Coat Fabric Person Height cm
Estimates centimeters of fabric for a long coat from desired height and fabric width.
Blazer Fabric Person Size cm
Estimates centimeters of fabric for a tailored blazer from chest and desired length.
Bermuda Shorts Fabric Person Size cm
Estimates centimeters of fabric for bermuda shorts from length and waist.
Shorts Fabric Person Size cm
Estimates centimeters of fabric for short shorts from desired length and waist.
Curtain Fabric Window Width cm
Estimates curtain fabric centimeters from window width and desired pleat ratio.
Pillowcase Fabric cm
Estimates centimeters of fabric to make a pillowcase from pillow dimensions.
Bedsheet Fabric Size cm
Estimates centimeters of fabric for a bedsheet from mattress dimensions with standard overhang.
Telescope Magnification Eyepiece Focal
Computes telescope magnification from objective focal length and eyepiece focal length.
Telescope Exit Pupil Diameter mm
Computes telescope exit pupil in millimeters from objective diameter and current magnification.
Telescope Resolving Power Diameter mm
Computes telescope angular resolving power in arcseconds using Dawes limit formula.
Telescope Limiting Magnitude Diameter mm
Estimates visual limiting stellar magnitude of a telescope from objective diameter in millimeters.
Telescope Field of View Eyepiece Magnification Degrees
Computes telescope true field of view in degrees from eyepiece apparent field and magnification.
Binocular Magnification Light Power Ratio
Computes binocular light per magnification ratio from equipment specs.
Binocular Exit Pupil mm
Computes binocular exit pupil in millimeters from objective diameter and magnification.
Astrophoto Tracking Exposure Time Min
Estimates total astrophoto exposure minutes in a tracked session from number of subs.
Darkframe Stacking Time Min
Computes total minutes to capture calibrated darks in an astrophoto session by summing exposures.
Stacking Frames Tracking Photo
Estimates number of frames needed to stack for a desired SNR gain in astrophoto.
ISS Orbit Tracking City Min
Estimates minutes the ISS is visible in a typical city pass given max elevation.
Comet Pass Magnitude Days
Estimates days a comet stays visible to the naked eye from its peak magnitude and human limit.
CVSS 3.1 Score
Calculates CVSS 3.1 Base Score from AV, AC, PR, UI, S, C, I, A metrics.
CVSS Base Vector Decoder
Decodes a CVSS base vector string and estimates the numerical score from average weight.
Beer IBU Calculator
Calculates beer IBU from hop amount and alpha acid percentage.
Beer SRM Calculator
Calculates beer SRM from malt color and amount.
Beer ABV Calculator
Calculate the alcohol content (ABV) of your craft beer from the original gravity (OG) and final gravity (FG). An essential tool for home brewers.
Logistic Odds Ratio
Computes odds ratio from logistic regression beta coefficient.
Breusch-Pagan Test
Computes BP heteroscedasticity statistic from n and auxiliary R squared.
Hand Orthopedics Wrist Ganglion Criteria Calculator
Evaluates criteria for Wrist Ganglion in hand and wrist orthopedics.
Hand Orthopedics Scaphoid Fracture Criteria Calculator
Evaluates criteria for Scaphoid Fracture in hand and wrist orthopedics.
Hand Orthopedics Colles Fracture Criteria Calculator
Evaluates criteria for Colles Fracture in hand and wrist orthopedics.
Hand Orthopedics Smith Fracture Criteria Calculator
Evaluates criteria for Smith Fracture in hand and wrist orthopedics.
Hand Orthopedics Barton Fracture Criteria Calculator
Evaluates criteria for Barton Fracture in hand and wrist orthopedics.
Hand Orthopedics Rhizarthrosis Criteria Calculator
Evaluates criteria for Rhizarthrosis in hand and wrist orthopedics.
Hand Orthopedics Ulnar Instability Criteria Calculator
Evaluates criteria for Ulnar Instability in hand and wrist orthopedics.
Coast FIRE Calculator (Financial Independence)
Computes Coast FIRE: minimum net worth so that compound returns alone reach your FIRE number by retirement. Compares Lean/Regular/Fat FIRE.
Inverse Rule of 72 (yield to double in N periods)
Given N periods to double your capital, compute the required yield using Rule of 72/70/69.3 and compare to the exact discrete rate.
Carb/Insulin Ratio (ICR) and Insulin Sensitivity Factor (ISF)
Computes ICR (rule of 500/450) and ISF (rule of 1800/1500) from your Total Daily Dose (TDD). Estimates meal bolus and correction from carbs, current BG and target.
Elo Rating Match Update
Compute updated Elo ratings for two players from a 1v1 result (1, 0.5 or 0), showing each side's expected score, delta and chosen K-factor.
Narcissistic / Armstrong Numbers Checker
Check whether a number is narcissistic/Armstrong (153 = 1³+5³+3³). Show the digit-power decomposition and list all narcissistic numbers in a range. Displays all 36 known base-10 narcissistic numbers from 0 to 4,679,307,774.
Growing Degree Days (GDD)
Compute the growing degree days (GDD), GDD = (Tmax + Tmin)/2 − Tbase, the daily thermal accumulation above the base temperature below which the plant does not grow. Since crop development is driven by temperature, summing degree days predicts phenological stages — flowering, maturity, harvest — more accurately than the calendar. Also used for pests and insects. Enter the day's maximum and minimum temperatures and the crop base temperature.