How to build a cost savings calculator for your sales page

"You're paying €500/month for that today — we're €149" is a strong claim. Let the visitor type their own number and watch the saving appear, and it becomes proof instead of a claim. A cost savings calculator is the simplest calculator you can build, and often the one with the highest conversion: it asks one question the visitor already knows the answer to.

1. The formula

Cost savings is current spend minus your price, full stop:

monthly_saving = current_cost - our_price

Keep our_price fixed to what you actually charge (pull it from your own pricing, never invent a number the visitor can't verify), and let only current_cost come from the visitor.

2. Ask for one number, not a breakdown

Resist asking for "current software cost + current labor cost + current overhead" as separate fields. A visitor who has to add up their own spend before they can even start will leave. One field — "what do you currently pay per month?" — gets answered in one glance, even if it is a rough number.

3. Show the saving twice: monthly and yearly

€351/month sounds modest; €4,212/year sounds like a budget line. Say both — the yearly figure is usually the one that gets forwarded to a decision-maker.

4. Never let the saving go negative in public

If a visitor types a current cost lower than your price, a calculator that proudly announces "you would lose €40/month by switching" is honest but is not a sales tool on your own pricing page. Either floor the result at zero with a neutral line ("Switching costs about the same — see what else changes"), or, if negative results matter to your argument (a comparison page, not a sales page), say so plainly instead of hiding it.

5. Start from the template

WidgetCalc's cost savings calculator template already has this formula and the two fields (current cost, your price) set up — open it, set your own price as the default, and publish.