Resin pours, dome struts, shingles.
- Carburetor Size Calculator: CFM & mm Guide516.5 CFM
- CFM Calculator for Exhaust Fans: How to Size320 CFM
- Electric Car Charging Calculator: Cost & Time4.86 h
10 pages Open →
Free calculators for makers, players and growers
The sum for your hobby, chalked out step by step
Resin pours, frets, dog years, bushels and buffers: type your numbers and the answer updates, with the formula and a worked example.
Epoxy Resin Calculator: How Much Resin for a Pour
Shelf 01 · Craft and Workshop
Mixed resin needed
fl oz
- Mixed resin needed
- mL
- Result, rounded to a whole number
- Part A (resin)
- fl oz
- Result, rounded to 2 decimal places
- Part B (hardener)
- fl oz
- Result, rounded to 2 decimal places
fl oz = length × width × depth × (1 + extra ÷ 100) ÷ 1.8047 Formula and worked example →
The eight shelves
See every shelf →
Cents to hertz, fret positions.
2 pages Open →
Dog years, pens, runs and coops.
- Dog Years to Human Years Calculator39.0 years
- Round Pen Calculator: Panels, Circumference and Area188.5 ft
3 pages Open →
Grain bins, yields, plant stands and grow lights.
7 pages Open →
Buffer pH, DNA copy numbers.
5 pages Open →
Class width, empirical rule, CV.
- Final Exam Calculator: Weighted Grade & Score Needed101.7 %
- How Many Possibilities Calculator? Count Combinations
5 pages Open →
Elo, passer rating, watts per kg.
5 pages Open →
Antilogs and inverse logs.
14 pages Open →
Calculators to start with
See all 51 →- 01Epoxy Resin Calculator: How Much Resin for a PourCraft and Workshop21.94 fl oz
- 02How Many Shingles Do I Need? Bundles and SquaresCraft and Workshop60 bundles
- 03Cents to Hertz CalculatorMusic and Audio466.16 Hz
- 04Guitar Fret Calculator (Fret Position from the Nut)Music and Audio12.750 in
- 05Dog Years to Human Years CalculatorPets and Animals39.0 years
- 06Grain Bin Calculator: Bushels in a Round BinFarm and Grow11,360 bu
- 07Corn Yield Calculator (Bushels per Acre)Farm and Grow186.7 bu/acre
- 08Daily Light Integral (DLI) CalculatorFarm and Grow23.04 mol/m²/day
- 09Henderson-Hasselbalch Calculator (pH from pKa)Lab and Chemistry5.06
- 10Elo Win Rate Calculator (Expected Score)Games and Sports64.01 %
How every sum is worked
Read the method →- 01Textbook formulaEach page uses the standard formula and prints it, with every variable and unit defined.
- 02Live answerThe result updates as you type; inputs outside a sensible range are refused with a message.
- 03Stated roundingEach result says how it is rounded; things you buy in whole units round up.
- 04Checked exampleThe worked example repeats the sum step by step with the default numbers.