ERP ROI Calculator
Put numbers behind an ERP decision. Enter what the manual work costs you today and what the system would cost, and see payback, ROI, NPV and IRR — with the ramp-up period that most business cases forget.
Time lost to manual work
The biggest saving in most ERP cases, and the easiest to overstate — be conservative with the recovery rate.
Stock
Leave the stock value at zero if you do not hold inventory.
Errors and software
What the system costs
Assumptions
Payback period
1y 1m
Rs 3.90 lakh of benefit a month against Rs 80,000 of running cost
Where the benefit comes from
- Time recoveredRs 3.90 lakh/mo
25 people × 6 h/week × 50% recovered
Cumulative cash position
Month 0 to 60. The dashed line is break-even.
These figures are only as good as the assumptions above. The recovery rate is the one worth arguing about — halve it and see whether the case still holds.
What you can do
- Build a defensible case. Payback, ROI, NPV and IRR from one set of assumptions anyone can inspect.
- Model the ramp honestly. Benefits phase in over the months you specify rather than appearing on go-live day.
- See which benefit carries the case. If recovered time is 90% of it, that is the number your board will challenge.
- Include your own team's time. The cost that turns a confident business case into a realistic one.
- Stress-test it. Halve the recovery rate, double the implementation cost, and see whether the answer holds.
The number to argue about
Almost every ERP business case rests on one figure: how much of the time currently lost to manual work is genuinely recovered. Assume 100% and any system pays for itself. Assume 40% and a lot of projects stop making sense. It is worth agreeing that number with the people who will actually use the system before anyone signs anything — which is much easier when the model is in front of you and the assumption is a field you can change.
Frequently asked questions
How is ERP payback calculated?
By building a month-by-month cash flow. The implementation cost lands up front, then each month adds the savings the system produces and subtracts what it costs to run. Payback is the point where the running total crosses back above zero — interpolated within the month, so the answer is not always a whole number.
What is the ramp-up period for?
It is the most commonly omitted assumption in ERP business cases. Benefits do not start on go-live day: people are learning the system, data is still being cleaned, and old processes run in parallel for a while. The calculator ramps the benefit in linearly over the months you specify, which typically pushes payback several months later than a naive model suggests.
What is the difference between ROI, NPV and IRR?
ROI is the simplest: total net benefit as a percentage of total cost, ignoring when the money moves. NPV discounts every future cash flow back to today at a rate you choose, so a rupee saved in year five counts for less than one saved next month — a positive NPV means the project beats that hurdle rate. IRR is the discount rate at which NPV would be exactly zero, which makes it easy to compare against the return on anything else you might do with the money.
What discount rate should I use?
Usually your organisation’s cost of capital, or the return you would expect from the next best use of the same money. In Pakistan that is often benchmarked against prevailing policy and lending rates, so the figure moves. If you are unsure, run it twice — once optimistic and once pessimistic — and see whether the decision actually changes.
Is the time-saving benefit realistic?
Only if you are honest about the recovery rate. Hours that disappear from a process do not automatically become value; they become value when that capacity is redeployed or when headcount does not need to grow. A conservative figure — recovering half the lost time rather than all of it — produces a business case that survives contact with reality. Halve the rate and see whether the project still stands up.
Why include our own team’s time as a cost?
Because it is the largest hidden cost of an ERP rollout. Your people spend months specifying, testing, cleaning data and training, and that time comes out of their normal work. Business cases that count only the vendor’s invoice routinely understate the true investment by a third or more.
Is anything I enter sent to you?
No. Every figure stays in your browser — nothing is transmitted, stored or logged. You can model a real budget here without it becoming a sales lead.
Want these numbers checked against your actual processes?
AgileTechForge builds ERP systems for Pakistani businesses — and will tell you honestly when the case does not stack up yet.
Talk to our team