PlungeWise.

FREE COLD PLUNGE CALCULATORS

Big chill.
Your budget.

Pick your path. Slide. See your setup.

Find my chill

Or build your own setup →

You bring the chill.
I’ll do the math.

A LITTLE MATH. A LOT OF CHILL.

Slide into your next plunge.

Free. Instant. All yours.

Chill your ice bill.

Try your numbers. See what changes.

Electricity & other details

Include pump, fittings and installation in setup cost. Use measured daily energy if you have it. Common tub and water costs are excluded.

USD · Editable examples, not product prices.

More little upgrades for your plunge
THE COOL STUFF

Little upgrades. Big brrr.

Paid links. As an Amazon Associate I earn from qualifying purchases.

  • PLUNGE BASE

    The Cold Pod · 85 gal

    85-gallon tub + thermal cover.

    View tub on Amazon
  • FREEZER FRIEND

    Make your own ice

    Ice molds. Check your freezer space.

    See ice molds
  • LESS GUESSWORK

    Know your water

    A thermometer for your water.

    See thermometers
  • TUB TOPPER

    Find a cover that fits

    Keep it covered. Check the fit.

    See covers
  • CHECK THE FIT

    Connect the pieces

    Hoses & fittings that match.

    See fittings
  • FILTER REFILL

    Match your filter

    Match your filter’s cartridge.

    See filters
  • TEAM SHOWER

    Choose your flow

    Choose your flow. Does not cool water.

    See showerheads
  • FINISHING TOUCH

    A spot for your feet

    A mat suited to your surface.

    See mats
Product details & fit

The Cold Pod link opens the named 85-gallon tub with full-wrap thermal cover. Listed outer size: 29.5 × 29.5 × 29.5 in; no chiller included. Listing checked September 30, 2026. Other links open Amazon searches. We have not physically tested these products. Confirm model, seller, price, usable space, compatibility and shipping before buying.

READY TO GO BIGGER?

Meet the chill makers.

Manufacturer links, without affiliate tracking. Research-based; not hands-on tested.

Before you choose

Check usable space, filled weight, electrical requirements, warranty and delivery. Confirm the selected chiller version, included accessories and whether a chiller is included in the bundle. Manufacturer pages checked September 23, 2026; confirm current specifications and prices with the brand.

Peek at the cool science

Ice shower calculation

Water use = flow × run time. Continuous cooling power = (flow in L/min ÷ 60) × 4.186 × (tap °C − target °C), in kW. Water is approximated as 1 kg/L. Heat removed = water liters × 4.186 × temperature drop, in kJ.

This is thermal cooling duty, not electrical consumption or a product rating. The ideal estimate excludes heat gains and equipment losses; actual output depends on operating conditions. It does not calculate a safe exposure time.

Based on OpenStax’s heat-capacity relationship.

Ice calculation

We balance the heat lost by the water against the energy needed to warm the ice to 0°C, melt it, and warm the meltwater to your target. Water is approximated as 1 kg per liter. Leave room for that extra water.

m = V × 4.186 × (Tstart − Ttarget) ÷ [2.09 × (−Tice) + 334 + 4.186 × Ttarget]. Temperatures in °C; mass in kg.

Constants: water 4.186 and ice 2.09 kJ/kg·°C; melting 334 kJ/kg. Heat capacity reference · Melting reference.

Cost comparison

Ice cost = sessions/week × 52 × bags/session × bag price. Chiller running cost = daily kWh × 365 × electricity price + 12 × monthly upkeep.

We add your setup cost once. Simple payback divides it by the monthly operating savings. It assumes year-round use and excludes financing, resale, repairs beyond entered upkeep, and the value of your time.

Setup suggestions use the preferences you select. Before choosing equipment, check tub volume, insulation, ambient conditions, cooling time, compatibility and the manufacturer’s ratings.

A LITTLE KNOW-HOW

Make your next splash.

Start with the basics Find a tub that fits Build your own brrr

Stay curious.
Stay a little chilly.

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