<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"><channel><title>Olvatra guides</title><description>Ready-to-use Excel and Google Sheets templates for planning content, tracking invoices and measuring influencer campaigns. Formulas built and tested, so you just fill in the yellow cells.</description><link>https://olvatra.com/</link><item><title>How to calculate engagement rate, and which version to use</title><link>https://olvatra.com/guides/how-to-calculate-engagement-rate/</link><guid isPermaLink="true">https://olvatra.com/guides/how-to-calculate-engagement-rate/</guid><description>The three common engagement rate formulas, when each one is the right choice, and how to work them out in Excel or Google Sheets without the averaging mistake most reports make.</description><pubDate>Thu, 15 Oct 2026 00:00:00 GMT</pubDate></item><item><title>Influencer campaign ROI: CPM, cost per click, cost per sale and ROAS explained</title><link>https://olvatra.com/guides/measure-influencer-campaign-roi/</link><guid isPermaLink="true">https://olvatra.com/guides/measure-influencer-campaign-roi/</guid><description>The five numbers that tell you whether a creator was worth the money, how to calculate each one in a spreadsheet, and how to count costs and sales honestly.</description><pubDate>Thu, 15 Oct 2026 00:00:00 GMT</pubDate></item><item><title>How to track unpaid invoices as a freelancer, in one spreadsheet</title><link>https://olvatra.com/guides/track-unpaid-invoices-spreadsheet/</link><guid isPermaLink="true">https://olvatra.com/guides/track-unpaid-invoices-spreadsheet/</guid><description>Set up due dates, an automatic overdue status, days overdue and an ageing summary in Excel or Google Sheets, plus a simple schedule for chasing late payers.</description><pubDate>Thu, 15 Oct 2026 00:00:00 GMT</pubDate></item></channel></rss>