Free customer calculators that connect experience metrics to business impact.
Calculate NPS, CSAT, CES, churn, retention and survey sample size directly in your browser. See the metric first, then add simple business assumptions to understand the revenue and gross-profit exposure behind it.
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Use the score to decide what to fix — and the financial scenario to decide what deserves priority. Each calculator separates the real indicator from the business assumptions so you can change the numbers and test different decisions. Monthly revenue is optional: enter your real number for a personalized scenario, or leave it blank to use a clear 100,000/month example.
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NPS Calculator
What is NPS?
NPS means Net Promoter Score. It is a customer recommendation indicator built from a simple question such as: “From 0 to 10, how likely are you to recommend our company, product or service?” Scores 9–10 are promoters, 7–8 are passives and 0–6 are detractors.
The result ranges from -100 to 100. It helps you track whether your customer base contains more strong advocates than unhappy customers, which can signal retention risk, reputation strength, referral potential and repeat-purchase opportunities.
Enter how many responses were promoters (9–10), passives (7–8) and detractors (0–6).
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NPS Calculator
NPS helps show how many customers are satisfied and represent opportunities to expand revenue, how many are neutral, and how many are dissatisfied and may represent risk to your revenue and business. Based on this, the calculator estimates how much revenue may be at risk and what share of your customer base can be encouraged to contribute to business expansion.
How to read your NPS
A positive NPS means promoters outnumber detractors; zero means they are balanced; a negative NPS means detractors are more common.
Use the trend, customer segments and comments instead of chasing a universal “good” number. The useful question is where the score is improving or deteriorating and why.
NPS can reveal commercial risk and opportunity, but the score alone does not prove revenue. Connect it with churn, repeat purchases, complaints and referrals to see the real business effect.
How to improve NPS without chasing the number
Close the loop with detractors quickly and group the recurring reasons behind low scores.
Protect promoters: ask what they value most and use those strengths in retention, referral and repeat-sale actions.
Compare NPS by product, branch, channel or journey so one strong area does not hide a costly weak point.
NPS impact simulator
Calculate the financial impact on your business after raising your NPS
Use the NPS result you just calculated to test two practical actions: recover detractors and activate promoters to generate recommendations.
This scenario moves that share of detractors into the promoter group and recalculates NPS and revenue at risk.
NPS today—
Projected NPS—
Monthly revenue at risk today—
Monthly revenue at risk after recovery—
Monthly revenue protected—
Annual revenue protected—
Annual gross profit protected—
For this simple scenario, we assume one third of activated promoters brings one new customer.
Promoter share today—
Estimated customer-base growth—
Monthly revenue today—
Projected monthly revenue—
Estimated additional monthly revenue—
Estimated additional annual revenue—
Estimated additional annual gross profit—
These are illustrative scenarios, not guaranteed results. The referral scenario assumes the survey reflects your customer base, customers have similar average revenue, and one in three activated promoters brings one new customer.
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CSAT Calculator
What is CSAT?
CSAT means Customer Satisfaction Score. It measures how satisfied customers were with a purchase, delivery, support interaction, product experience or another specific moment.
This calculator uses response counts already classified as satisfied, neutral and dissatisfied. Keep the same classification rule over time so you can compare results. A declining CSAT can expose friction that leads to complaints, rework, refunds, lost repeat purchases and churn.
Use satisfied, neutral and dissatisfied response counts. CSAT is the percentage of satisfied responses.
Free calculator
CSAT Calculator
CSAT helps expose dissatisfaction after purchases and service interactions. The financial scenario applies the dissatisfied share to monthly revenue and estimates the gross-profit upside if part of that risk is recovered. Use your real revenue or the clearly labeled 100,000/month example.
How to read your CSAT
A higher CSAT means a larger share of the measured responses were satisfied according to the rule used in your survey.
Measure close to the interaction you want to improve. A support CSAT and a delivery CSAT answer different business questions and should not be mixed.
Track the reasons behind dissatisfied responses. The percentage becomes commercially useful when it points to a process, product or journey that can be fixed.
How to maximize CSAT
Measure close to the interaction so the team can connect the score to a specific process.
Separate product, delivery, service and support causes instead of treating all low scores as the same problem.
Use open comments to fix the cause, not just to ask the customer to change the rating.
Practical impact simulator
Calculate the financial impact after improving your CSAT
Test two practical actions: recover dissatisfied customers and encourage satisfied customers to buy again.
This percentage of dissatisfied customers becomes satisfied. CSAT and revenue at risk are recalculated.
CSAT Current—
CSAT After the goal—
Monthly revenue at risk today—
Monthly revenue at risk after the goal—
Revenue protected per month—
Revenue protected in 12 months—
Gross profit protected in 12 months—
To keep the scenario simple, we assume 1 in every 3 incentivized customers makes one additional purchase equivalent to the current average contribution of one customer.
Current opportunity share—
Estimated revenue growth—
Current monthly revenue—
Projected monthly revenue—
Estimated additional revenue per month—
Estimated additional revenue in 12 months—
Estimated additional gross profit in 12 months—
These are illustrative scenarios based on the assumptions entered, not guaranteed outcomes. The 12-month values assume the action is repeated every month with a similar result.
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CES Calculator
What is CES?
CES means Customer Effort Score. In practical terms, it measures how easy or difficult it was for a customer to accomplish something with your company.
“Effort” can mean finding and buying a product, signing up or getting started, learning to use a service, finding information, solving a support problem, changing a plan, returning an item or cancelling. A typical question is: “How easy was it to resolve what you needed?” This calculator uses 1 = very difficult and 7 = very easy, so rate one specific task or interaction rather than the entire relationship.
This calculator assumes 1 = very difficult and 7 = very easy. Enter the number of responses for each score.
Free calculator
CES Calculator
High effort can increase repeat contacts, abandonment and lost repeat purchases. The financial scenario applies the high-friction share to monthly revenue so you can see how much revenue sits behind a difficult experience and what a realistic improvement target could mean for gross profit.
How to use CES in practice
Choose one task first: buying, onboarding, using, getting support, changing, returning or cancelling. Ask immediately after that experience whenever possible.
With the 1–7 scale used here, higher scores mean less effort. Low scores show where customers have to repeat steps, wait, search or contact you more than expected.
High effort can increase abandonment, repeat contacts and service cost and can reduce the chance of buying again. Use CES to find the friction, then validate the financial effect with churn, repurchase and support data.
How to improve CES
Remove unnecessary steps, fields and handoffs from the customer journey.
Avoid asking customers to repeat information your company already has.
Track first-contact resolution and the journeys that generate the most repeat contacts.
Practical impact simulator
Calculate the financial impact after reducing customer effort
Test two actions: reduce high-friction experiences and encourage customers who had an easy experience to buy again.
This percentage of scores 1–3 moves to score 6 (easy). CES and revenue at risk are recalculated.
CES Current—
CES After the goal—
Monthly revenue at risk today—
Monthly revenue at risk after the goal—
Revenue protected per month—
Revenue protected in 12 months—
Gross profit protected in 12 months—
To keep the scenario simple, we assume 1 in every 3 incentivized customers makes one additional purchase equivalent to the current average contribution of one customer.
Current opportunity share—
Estimated revenue growth—
Current monthly revenue—
Projected monthly revenue—
Estimated additional revenue per month—
Estimated additional revenue in 12 months—
Estimated additional gross profit in 12 months—
These are illustrative scenarios based on the assumptions entered, not guaranteed outcomes. The 12-month values assume the action is repeated every month with a similar result.
Free calculator
Churn Loss Calculator
What is churn?
Churn is customer loss: the percentage of customers you had at the start of a period who left, cancelled or stopped being customers during that period.
This calculator measures customer churn, not revenue churn. New customers do not erase the customers you lost from this metric. Churn matters because it removes revenue you already won and forces the business to acquire more customers just to replace the ones that left.
Measure how many customers were lost during the month and translate that loss into revenue and gross profit.
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Churn Loss Calculator
Churn is not just a percentage: it removes a share of the revenue the business already earns. The calculator applies the churn rate to monthly revenue and shows the monthly revenue loss plus the annualized gross-profit impact if the same pace continues. Use your real revenue or the 100,000/month example.
How to read churn
A monthly churn of 3% means that 3 out of every 100 customers you had at the start of the month were lost during that month.
Your total customer base can still grow if acquisition is strong, even while churn is unhealthy. Track acquisition and churn separately.
The annual financial figure shown here is an annualized scenario if the same monthly pace continues, not a forecast. Use it to understand the size of the problem and prioritize retention work.
How to reduce churn
Identify the reasons for churn before the cancellation: complaints, delays, low usage and repeated friction are early signals.
Prioritize retention where customer value and gross margin justify proactive recovery.
Improve onboarding and the first weeks of the relationship; many avoidable losses begin before the customer builds a habit.
Practical impact simulator
Calculate the financial impact after reducing churn
See how much revenue can be protected by preventing customer loss, then test growth with customers who stayed.
This percentage of lost customers is considered retained. Churn and lost revenue are recalculated.
Churn Current—
Churn After the goal—
Monthly revenue at risk today—
Monthly revenue at risk after the goal—
Revenue protected per month—
Revenue protected in 12 months—
Gross profit protected in 12 months—
To keep the scenario simple, we assume 1 in every 3 incentivized customers makes one additional purchase equivalent to the current average contribution of one customer.
Current opportunity share—
Estimated revenue growth—
Current monthly revenue—
Projected monthly revenue—
Estimated additional revenue per month—
Estimated additional revenue in 12 months—
Estimated additional gross profit in 12 months—
These are illustrative scenarios based on the assumptions entered, not guaranteed outcomes. The 12-month values assume the action is repeated every month with a similar result.
Free calculator
Customer Retention Calculator
Enter customers at the beginning and end of the month and subtract new customers added during the period.
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Customer Retention Calculator
Retention shows how much of the existing customer base stays with you without new acquisition hiding losses. The financial scenario applies the retention rate to monthly revenue and shows how much annual gross profit a +1 percentage-point improvement could preserve.
How to maximize retention
Monitor satisfaction and effort before renewal or repurchase moments, not only after a complaint.
Create recovery actions for customers at risk and growth actions for satisfied customers instead of sending the same message to everyone.
Measure retention by cohort, plan, product or segment to find where profitable customers are leaking.
Practical impact simulator
Calculate the financial impact after increasing retention
Test how much revenue can be protected by retaining more customers and how the retained base can support additional sales.
This percentage of customers not retained is added back to the retained base. Retention and revenue at risk are recalculated.
Retention Current—
Retention After the goal—
Monthly revenue at risk today—
Monthly revenue at risk after the goal—
Revenue protected per month—
Revenue protected in 12 months—
Gross profit protected in 12 months—
To keep the scenario simple, we assume 1 in every 3 incentivized customers makes one additional purchase equivalent to the current average contribution of one customer.
Current opportunity share—
Estimated revenue growth—
Current monthly revenue—
Projected monthly revenue—
Estimated additional revenue per month—
Estimated additional revenue in 12 months—
Estimated additional gross profit in 12 months—
These are illustrative scenarios based on the assumptions entered, not guaranteed outcomes. The 12-month values assume the action is repeated every month with a similar result.
Free calculator
Survey Sample Size Calculator
Estimate how many completed responses you need from a finite customer base and how many invitations to send at your expected response rate.
Free calculator
Survey Sample Size Calculator
A good sample reduces the chance of making expensive decisions from too few opinions. Monthly revenue provides economic context for the customer base you are trying to understand. Enter your real revenue or use the 100,000/month example; the sample itself does not create profit.
How to get a better sample
Keep the survey short and send it close to a meaningful customer interaction.
Use reminders carefully and improve response rate before simply increasing the number of invitations.
Make sure the invited group represents the customers you actually want to make decisions about.
Practical impact simulator
Calculate how to improve survey efficiency and confidence
Use the sample you just calculated to test a higher response rate or a different margin of error. Revenue stays as business context; sample quality does not create revenue by itself.
A higher response rate can reduce how many invitations are needed to reach the same sample.
Current response rate—
Target response rate—
Invitations needed today—
Invitations with the target—
Invitations avoided—
A smaller margin of error requires more responses and usually more invitations; a larger margin requires fewer.
Current margin of error—
Target margin of error—
Responses needed today—
Responses needed with the target—
Invitations needed today—
Invitations with the target—
These are illustrative scenarios based on the assumptions entered, not guaranteed outcomes.
About the financial estimates
Revenue and gross-profit values are simple scenarios based only on the assumptions you enter. They are not forecasts, accounting advice or proof that changing an experience metric will cause the financial result shown. Use them to compare priorities and test assumptions.
Want to measure these signals continuously instead of calculating them manually?
CX Radar automates customer satisfaction and NPS surveys, identifies customers at risk and helps turn feedback into retention and repeat-sale actions.
