🧮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.
2904 tools
Wall Anchors by Hole
Estimates plastic anchors per hole by hole size.
Washers per Screw
Estimates washers needed for through-bolts in DIY assemblies.
Garden Hose Length
Estimates meters of hose needed for a path with safety margin.
Electrical Tape Splices
Estimates electrical tape (m) needed for splices.
Thread Seal Tape Joints
Estimates thread seal tape meters for threaded joints (5 turns each).
PVC Glue Pipe Joints
Estimates PVC glue ml for plumbing pipe joints.
Epoxy Glue Mix Volumes
Computes A and B volumes of epoxy glue in 1:1 or 2:1 mix.
Acrylic Paint Artwork
Estimates acrylic paint ml for artwork on canvas by size.
Wall Filler per sqm
Work out how many kilograms of wall filler you need to level a wall from the area in m². Plan the right amount and avoid waste on your project.
Roof Waterproof per sqm
Work out how many kilograms of asphalt waterproofing you need for a roof slab from the area in m². Protect against leaks without wasting material.
Screen Reader WPM Time
Estimates how many minutes a screen reader needs to read a given word count at 180 WPM.
Mobile Tap Target Size WCAG
Checks if a touch target meets the WCAG 2.5.5 minimum of 44x44 CSS pixels.
Accessible Form Response Time
Estimates acceptable form completion time based on the number of fields (12 s per field).
WCAG AA Text Size
Recommends a minimum body text size in pixels for WCAG AA at typical reading distance.
WCAG AAA Text Size
Recommends minimum text size in pixels for WCAG AAA at typical reading distance.
Mobile Task Taps Count
Estimates total taps to complete a mobile task based on screen count (3 taps per screen).
Accessible Task Completion Time
Estimates minutes to complete an accessible task by step count (30 s per step).
Clickable Link Area mm
Converts the 44 px tap target to physical millimeters based on display DPI.
Interactive Feedback ms
Indicates whether an interaction response time is instant, acceptable, slow, or critical.
Safe Vestibular Animation ms
Checks whether an animation duration is safe for users with vestibular sensitivity.
Epileptic Safe Flash Hz
Checks whether flash frequency is below the WCAG 2.3.1 3 Hz safety threshold.
Accessible Focus Time ms
Estimates total milliseconds to focus a sequence of elements with TAB key.
Visible Focus Border px
Recommends minimum focus indicator thickness in pixels per WCAG 2.4.13.
NR-1 GHS Training Hours
Estimates annual GHS training hours required by Brazilian NR-1 standard per number of workers.
NR-6 PPE Life Months
Estimates PPE service life in months based on daily usage hours per Brazilian NR-6.
NR-10 Controlled Zone Radius
Returns the controlled zone radius in meters for an electrical voltage per Brazilian NR-10.
NR-12 Safety Distance
Computes minimum machine safety distance using ISO 13855 formula referenced by NR-12.
NR-15 Unhealthy Exposure
Computes Brazilian NR-15 unhealthy work allowance at 10, 20, and 40 percent of minimum wage.
NR-16 Hazard 30 Percent
Computes Brazilian NR-16 hazardous work bonus of 30 percent over base salary.
NR-17 Ergonomic Bench Height
Suggests a workbench height based on stature for standing work per Brazilian NR-17.
NR-18 Construction Perimeter
Computes construction site perimeter for fencing per Brazilian NR-18.
NR-23 Fire Extinguishers Area
Estimates fire extinguishers required by floor area per Brazilian NR-23 (1 per 500 m2).
NR-26 Pipe Color Coding
Returns the standardized pipe color for water, steam, oil, air, or gas per Brazilian NR-26.
NR-33 Confined Exposure Time
Determines safe permanence time in confined space based on measured oxygen per Brazilian NR-33.
NR-35 Anchor Height 2m
Checks whether anchor point height meets Brazilian NR-35 minimum of 2 meters.
NR-36 Cold Plant Break min
Estimates total break minutes per shift in meatpacking plants per Brazilian NR-36.
SP Bus Trip Time
Estimates urban bus travel time in Sao Paulo from distance at 18 km/h average speed.
SP Metro Trip Time
Estimates Sao Paulo Metro travel time by station count (~2.1 min per station).
CPTM Trains Trip Time
Estimates CPTM commuter train travel time in Sao Paulo by station count.
Rio VLT Trip Time
Estimates Rio de Janeiro VLT light rail travel time from distance at 18 km/h.
DF Metro Trip Time
Estimates Brasilia DF Metro travel time by station count (~2.4 min per station).
RJ SuperVia Trip Time
Estimates SuperVia commuter train travel time in Rio de Janeiro by station count.
POA Trensurb Trip Time
Estimates Trensurb commuter train travel time in Porto Alegre by station count.
BH Metro Trip Time
Estimates Belo Horizonte Metro travel time by station count (~2.5 min per station).
Paris RATP Bus Comparison
Estimates RATP Paris bus travel time at 14 km/h, useful to compare with Brazilian buses.
TGV Cruise Trip Time
Estimates TGV high-speed train travel time at 300 km/h cruise speed.
RJ City Bus Trip Time
Estimates Rio de Janeiro city bus travel time from distance at 16 km/h.
BH City Bus Trip Time
Estimates Belo Horizonte city bus travel time from distance at 17 km/h.
Party Cocktails per Person
Estimates average cocktails per person at a party (1.5 cocktail per hour).
Party Beer per Person
Estimates beers per person at a party (2 cans per hour, 350 ml each).
Sensor MP to Print Size DPI
Computes max print size at 300 DPI from camera sensor megapixels.
Crop Factor APS-C vs Full Frame
Compares APS-C diagonal with Full Frame and returns crop factor.
APS-C to Full Frame Focal Equivalence
Converts APS-C focal length to FF equivalent at 1.5x crop factor.
F-Stop Time ISO EV
Computes Exposure Value (EV) from aperture, shutter and ISO.
ISO Shutter Aperture by EV
Estimates ISO required to keep the same EV after changing aperture or shutter.
Minimum Shutter Handheld by Focal
Applies the focal length reciprocal rule for handheld shooting.
Exposure Bracketing Stops
Generates EV values for 3 or 5 bracketed shots at requested stop step for HDR.
Flash Guide Number by Distance
Returns ideal aperture from flash Guide Number and subject distance.
Flash ISO GN Distance Aperture
Combines GN, ISO, distance and aperture to verify flash exposure.
Flash Recycle Time Battery Pack
Estimates flash recycle time in seconds by power level and external battery pack.