Pool, Spa & Water Treatment Chemistry calculator

Chlorine Tablet Feed Rate Calculator

Convert daily chlorine demand into an estimated tablet count so feeder settings and service-route inventory can be checked against actual test results.

What this calculator does

  • Estimate chlorine tablet feed rate from pool volume, daily chlorine demand, tablet yield, and feeder efficiency.
  • Use it to plan trichlor feeder settings, route inventory, or expected tablet consumption.
  • Turns pool volume basis, daily free-chlorine demand, tablet demand factor into a practical tablets / day result for chlorine tablet feed rate.

Formula used

  • Tablet feed rate = pool volume basis x daily demand x tablet demand factor x feeder efficiency adjustment

Inputs explained

  • Pool volume basis: Divide pool gallons by 10,000. For a 20,000-gallon pool, enter 2.
  • Daily free-chlorine demand: Estimate from test history, sun exposure, bather load, and time of year.
  • Tablet demand factor: Enter 1 divided by tablet ppm yield per 10k gal. For 1.8 ppm per tablet, enter 0.56.
  • Feeder efficiency adjustment: Enter 100 divided by feeder efficiency percent. For 85% feeder efficiency, enter 1.18.

How to use the result

  • Use it when planning pool, spa, aquatics, service-route, or water-treatment chemistry adjustments.
  • Use the result for planning math only. Follow product labels, health codes, local regulations, test-kit instructions, chemical safety rules, and qualified pool operator guidance before dosing water.

Common questions

  • What is the chlorine tablet feed rate calculator for? Estimate chlorine tablet feed rate from pool volume, daily chlorine demand, tablet yield, and feeder efficiency.
  • What numbers do I need for chlorine tablet feed rate? You need pool volume basis, daily free-chlorine demand, tablet demand factor, feeder efficiency adjustment. Use measured test results and the same pool, spa, tank, or treatment volume for every input.
  • How should I use the result? Use the result to check dose size, run time, flow, inventory, or operating cost before changing a treatment plan or purchase order.
  • What should I verify before acting? Verify water volume, units, chemical strength, product label directions, bather load, local code, and current test results. Retest after treatment and never mix incompatible chemicals.

Last reviewed 2026-05-12.