CPM Calculator

Calculate campaign impressions, fees, payouts, and margins from monthly spend. Built for media planners and sales teams, with multi-partner support, creative and hosting fee toggles, and currency switching.

How It Works

The calculator has three main sections:

1. Global Settings

Toggle buttons control which optional features are visible. All toggles are off by default.

When Add Partner is enabled:

• Partner Name — free-text input that updates the "Partner" column header in the table (e.g. entering "Dianomi" changes the header to "Dianomi")
• Partner Share (%) and Net (%) are linked — they always sum to 100%. Changing one auto-updates the other

2. Campaign Overview

• Campaign CPM (£) — cost per thousand impressions (default: £15)
• Total campaign spend (£) — total budget for the campaign (default: £300,000)
• Calculated impressions — total impressions based on spend and CPM (read-only)

3. Monthly Breakdown Table

The primary output:

• One row per month (January through December)
• Campaign (£) — editable monthly spend
• Impressions — calculated impressions for that month
• Net — always visible, shows the net amount after all deductions and partner share

Optional columns (shown/hidden via toggle buttons):

• By Default — By Default earnings for the month
• Ad Hosting — Ad hosting costs for the month
• Partner — partner share amount for the month

The Totals row sums all monthly values.

Calculations

All calculations update instantly when inputs change. Impressions are always calculated, never manually entered.

Core Calculations

Impressions

(Campaign spend ÷ Campaign CPM) × 1,000

By Default Earnings (when enabled)

(Impressions ÷ 1,000) × By Default Fee CPM

Ad Hosting Cost (when enabled)

(Impressions ÷ 1,000) × Ad Hosting Fee CPM

Net Spend (calculated internally)

Campaign spend − By Default earnings − Ad hosting cost

Partner Split (when Add Partner is enabled)

Partner Share and Net are complementary percentages of net spend:

Partner Share

Net spend × (Partner Share % ÷ 100)

Net

Net spend × (Net % ÷ 100)

Where Partner Share % + Net % = 100% always.

When Add Partner is not enabled, the Net column shows 100% of net spend.

Usage Tips

1. Start with Campaign CPM — set your base CPM rate first
2. Enter monthly spend — type spend values directly in the table cells
3. Toggle optional features — click the toggle buttons in Global Settings to show/hide fields
4. Name the partner — use the Partner Name field to label the Partner column for your audience
5. Instant updates — all calculations update automatically as you type

Default Values

Technical Notes

• Plain JavaScript only (no external dependencies)
• All calculations are deterministic and visible
• Feature toggles use data-opt attributes on HTML elements
• Hidden features don't affect visible totals
• Works in all modern browsers