Two-Part Mix (Resin : Hardener)

Add the ratio numbers to count the parts and divide the batch. A 4:1 litre is five parts — 800 mL resin and 200 mL hardener.

Your numbers

Volume (mL)(mL)AB

Base (mL)

800mL

Hardener (mL)

200mL

Percentage

20%

Formula

Base (mL) = Volume (mL) × A ÷ (A + B)

Get the ratio wrong and two-part systems either stay tacky or cure weak. Some products state the ratio by weight rather than volume, so check the datasheet.

What to enter

Input	Default	Accepted range
Volume (mL) (mL)Volume in millilitres.	1,000	0 and up
AThe first number of the ratio — the 2 in 2:3.	4	0.1 and up
BThe second number of the ratio — the 3 in 2:3.	1	0.1 and up

Step by step

FormulaBase (mL) = Volume (mL) × A ÷ (A + B)

With the default numbersBase (mL) = 1,000 × 4 ÷ (4 + 1)

AnswerBase (mL) = 800 mL

Quick reference table

Results when only Volume (mL) (mL) changes and everything else stays put.

Volume (mL) (mL)	Base (mL) (mL)	Hardener (mL) (mL)	Percentage (%)
500	400	100	20
750	600	150	20
1,000	800	200	20
1,500	1,200	300	20
2,000	1,600	400	20

What each result means

Result	At default values
Base (mL) (mL)The larger of the two parts — the resin or base.	800
Hardener (mL) (mL)The hardener that makes it set.	200
Percentage (%)A share expressed out of 100.	20

Common mistakes

Get the ratio wrong and two-part systems either stay tacky or cure weak. Some products state the ratio by weight rather than volume, so check the datasheet.

Glossary

Volume (mL): Volume in millilitres.
A: The first number of the ratio — the 2 in 2:3.
B: The second number of the ratio — the 3 in 2:3.
Base (mL): The larger of the two parts — the resin or base.
Hardener (mL): The hardener that makes it set.
Percentage: A share expressed out of 100.

Frequently asked questions

QHow is Two-Part Mix (Resin : Hardener) calculated?

Base (mL) = Volume (mL) × A ÷ (A + B) — Add the ratio numbers to count the parts and divide the batch. A 4:1 litre is five parts — 800 mL resin and 200 mL hardener.

QCan you walk through an example?

With Volume (mL) 1,000mL, A 4, B 1, the answer is Base (mL) 800mL.

QWhat do I need to enter?

Enter Volume (mL), A, B. The result recalculates as you type, and an empty box counts as zero.

QHow much does the answer move if I change a number?

Changing only Volume (mL) (mL) moves the answer to Volume (mL) (mL) 500 → Base (mL) (mL) 400 and Volume (mL) (mL) 2,000 → Base (mL) (mL) 1,600. The table below lays out five steps.

QHow are the numbers rounded?

Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.

QAnything to watch out for?

Get the ratio wrong and two-part systems either stay tacky or cure weak. Some products state the ratio by weight rather than volume, so check the datasheet.

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