Free tools
Free survey calculators
Free survey calculators: NPS, CSAT and CES scores, sample size, margin of error and response rate, with the formula and a worked example for each.
- NPS calculator A free NPS calculator. Enter promoters, passives and detractors, or paste raw 0–10 scores from a CSV, and get your Net Promoter Score instantly.
- CSAT calculator A free CSAT calculator. Enter how many people gave each rating from 1 to 5, or paste raw ratings from a CSV, to get your satisfaction score and average.
- CES calculator A free customer effort score (CES) calculator. Enter counts for each score from 1 to 7, or paste raw scores, for your average and the share who found it easy.
- Survey sample size calculator A free survey sample size calculator. Enter population, confidence level and margin of error to see how many responses you need and how many to invite.
- Margin of error calculator A free margin of error calculator for surveys. Enter your number of responses and confidence level to see how far a result could be from the true figure.
- Response rate calculator A free survey response rate calculator. Enter how many people you invited, started and finished to get your response, completion and start rates.
Work out your score in seconds
Each calculator works in your browser. Nothing you type or paste is sent anywhere. Enter the counts from your survey tool, or paste the raw scores straight from a CSV export, and the score updates as you type. Every page explains how the number is calculated, with a formula you can paste into Excel or Google Sheets, and a worked example to check your own against.
There are two kinds. The score calculators (NPS, CSAT and customer effort) turn raw answers into the number you report. The planning calculators (sample size, margin of error and response rate) tell you how many responses you need, and how far to trust the ones you have.
Need the responses first? Each calculator links to a free hootform template, or a set of them, that collects exactly what it counts, with unlimited responses.