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
Board foot calculator
lumber volume from inches and feet, free
POST /build/board-foot$0.002
Developer Utilities
Board-on-board fence calculator
boards from length, width, overlap
POST /build/board-on-board-fence$0.002
Developer Utilities
Boiler size calculator
heating kW from floor area and insulation
POST /build/boiler-size$0.002
Developer Utilities
Bolt circle calculator
equally spaced hole coordinates, free
POST /build/bolt-circle$0.002
Developer Utilities
Bolt tightening torque
N·m from diameter, friction, clamp load
POST /build/bolt-torque$0.002
Developer Utilities
Bowl segment calculator
gallons and liters from radius and height
POST /build/bowl-segment$0.002
Developer Utilities
Cement calculator
bags and weight from mix ratio, free
POST /build/cement$0.002
Developer Utilities
CFM calculator
required airflow from room size and ACH
POST /build/cfm$0.002
Developer Utilities
Concrete block fill calculator
grout volume in cubic yards
POST /build/concrete-block-fill$0.002
Developer Utilities
Concrete tube calculator
cubic yards and bags from diameter, height
POST /build/concrete-tube$0.002
Developer Utilities
Concrete weight calculator
pounds from volume and mix density
POST /build/concrete-weight$0.002
Developer Utilities
Decking calculator
board count and total linear feet, free
POST /build/decking$0.002
Developer Utilities
Drywall calculator
sheets and area from wall lengths, free
POST /build/drywall$0.002
Developer Utilities
Elevation grade calculator
percent, ratio and angle from rise
POST /build/elevation-grade$0.002
Developer Utilities
Fence estimate calculator
posts, rails, pickets and total cost, free
POST /build/fence-estimate$0.002
Developer Utilities
Fence post burial depth
hole depth from post length and frost line
POST /build/fence-post-depth$0.002
Developer Utilities
Fire flow calculator
ISO needed GPM from area, free
POST /build/fire-flow$0.002
Developer Utilities
Wall framing calculator
studs, plates and lumber counts, free
POST /build/framing$0.002
Developer Utilities
French drain calculator
gravel cubic yards and pipe length
POST /build/french-drain$0.002
Developer Utilities
Square feet to cubic yards
area × depth to yd³ and ft³, free
POST /build/ft2-yd3$0.002
Developer Utilities
Glass pane weight calculator
pounds from size and density
POST /build/glass-weight$0.002
Developer Utilities
Gravel driveway calculator
cubic yards and tons from dimensions
POST /build/gravel-driveway$0.002
Developer Utilities
Grout calculator
volume and weight from tiles and joints
POST /build/grout$0.002
Developer Utilities
Hoop house calculator
film cover area and hoop count
POST /build/hoop-house$0.002
Developer Utilities
Sprinkler K-factor calculator
K = Q / √P from GPM and PSI
POST /build/k-factor$0.002
Developer Utilities
Limestone calculator
cubic yards and tons from L×W×D, free
POST /build/limestone$0.002
Developer Utilities
Log weight calculator
pounds and kg from diameter, length, density
POST /build/log-weight$0.002
Developer Utilities
Lumber calculator
board count and waste allowance, free
POST /build/lumber$0.002
Developer Utilities
Miter angle calculator
saw blade angle for corners, free
POST /build/miter-angle$0.002
Developer Utilities
Paver sand calculator
cubic yards from paved area and sand depth
POST /build/paver-sand$0.002
Developer Utilities
Pipe weight calculator
hollow pipe mass from OD, wall, length
POST /build/pipe-weight$0.002
Developer Utilities
Plywood calculator
sheets needed from surface and sheet size
POST /build/plywood$0.002
Developer Utilities
Pond volume calculator
gallons and liters from L×W×depth, free
POST /build/pond$0.002
Developer Utilities
Post hole concrete calculator
cubic yards minus post
POST /build/post-hole-concrete$0.002
Developer Utilities
Retaining wall calculator
blocks and cap units from length, free
POST /build/retaining-wall$0.002
Developer Utilities
Rip-rap calculator
stone tons from area, thickness, density
POST /build/rip-rap$0.002
Developer Utilities
Road base calculator
cubic yards and tons from dimensions
POST /build/road-base$0.002
Developer Utilities
Roof truss calculator
rafter length and truss count from span
POST /build/roof-truss$0.002
Developer Utilities
Round pen calculator
panels from diameter and panel length
POST /build/round-pen$0.002
Developer Utilities
Sealant calculator
tubes from joint length, width and depth
POST /build/sealant$0.002
Developer Utilities
Siding calculator
panels and squares from wall area
POST /build/siding$0.002
Developer Utilities
Snow load calculator
design roof snow load in psf, free
POST /build/snow-load$0.002
Developer Utilities
Sonotube calculator
cubic yards and bags from diameter, height
POST /build/sonotube$0.002
Developer Utilities
Spiral staircase calculator
treads, rotation and handrail
POST /build/spiral-staircase$0.002
Developer Utilities
Square yards calculator
length × width in feet to yd², free
POST /build/square-yards$0.002
Developer Utilities
Steel weight calculator
plate, bar, tube and angle, kg and lb
POST /build/steel-weight$0.002
Developer Utilities
Taper calculator
taper per inch and angle from diameters
POST /build/taper$0.002
Developer Utilities
Thread calculator
pitch, minor diameter and tap drill, free
POST /build/thread$0.002
Developer Utilities
Cooling tonnage calculator
room BTU and tons from area
POST /build/tonnage$0.002
Developer Utilities
True position calculator
diametral hole position error
POST /build/true-position$0.002
Developer Utilities
Vinyl siding calculator
squares and panels from walls, free
POST /build/vinyl-siding$0.002
Developer Utilities
Welding electrode calculator
count and weld metal weight
POST /build/welding$0.002
Developer Utilities
Wood beam span calculator
allowable span from grade, size, spacing
POST /build/wood-beam-span$0.002
Developer Utilities
Anaerobic threshold calculator
Karvonen heart rate, free
POST /sports/anaerobic-threshold$0.002
Developer Utilities
Batting average calculator
hits over at-bats to 3 decimals
POST /sports/batting-average$0.002
Developer Utilities
Batting strike rate calculator
runs per 100 balls
POST /sports/batting-strike-rate$0.002
Developer Utilities
Bike gear calculator
ratio and metres of development, free
POST /sports/bike-gear-calculator$0.002
Developer Utilities
Bike pace calculator
km/h and min/km from distance and time
POST /sports/bike-pace$0.002
Developer Utilities
Bike size calculator
frame size from height and inseam
POST /sports/bike-size$0.002
Developer Utilities
Calories burned by heart rate
estimate from HR, age, weight, sex
POST /sports/calories-burned-by-heart-rate$0.002