The bench: six free calculators

Bands, not false precision. Your prices, your currency, nothing seeded.

Grain hydration calculator

How much water does 1.2 kg of rye need?

Water per gram of dry grain, by grain and by method, with the band rather than a false single figure.

How much spawn and how much coir fills a 12 quart tub 8 cm deep?

Bed volume from the tub and the depth, split by the ratio, with weights from stated densities you can change.

How much water does a 650 g coir brick take?

Water, gypsum and the finished weight, with the squeeze test spelled out because the jug is only ever an opening bid.

How long do quart jars need at 15 psi?

Hold times as bands, altitude allowed for as an openly labelled rule of thumb, and the safety rules under every answer.

What will 400 g of fresh fruit weigh once it is dry?

The dry weight band from the fresh weight, and a plain statement that the scales are not the test.

What will my first grow actually cost me?

Your prices, your currency, no seeded figures. The first grow and the second one side by side.