Free tool

Water & Supplies Calculator

How many gallons, how many cups, how many bananas. Worked out from your field size, your aid stations and the weather, and shown as things you can actually put on an order.

Your race

Nothing is saved or sent anywhere but the calculation.

The field

Runners

# of aid station stops Not counting the finish

Water at the finish too Yes No

Conditions

Expected temperature

Share as sports drink Comes out of the water total, not on top %

Spare Cups get dropped, stacked wet and thrown away full %

Ounces poured per cup

Everything else, per runner

Gels

Bananas Half a banana each is the usual cut

Orange slices

Snacks at the finish

Buy

Cups -

Plain water -

Sports drink -

Five-gallon jugsOr bottled, below -

Cases of 24 bottles16.9oz bottles, if you buy it that way -

Per aid station -

These are planning figures from ordinary race practice, not a study. Every driver above is yours to change, and the arithmetic is on the page rather than behind it. How much any individual runner should drink is a question for your medical provider, not a calculator.

Put this straight into your budget

The budget builder has lines for water, food and aid station supplies waiting.

Open the budget builder