Why ‘Free’ Outperforms ‘$0’ in Pricing

You bundle things. The membership comes with an intro PT session, the 10-class pack throws in a nutrition consult, the upgrade tier includes a programme review you’d otherwise charge for. One of the most important decisions you make is how to approach gym bundle pricing. At some point you decided how to write that second thing on the page. You could fold it into one number and quote a clean monthly rate, list it separately with a price beside it, or call it free.

Most operators reach for the clean single number, because fewer figures feels like less friction. That call gets made in about four seconds and never gets revisited.

A run of recent research suggests those four seconds picked the weakest option on the table.

What the research found

Jungkeun Kim and colleagues ran ten experiments with 2,458 people, published in 2026 in the International Journal of Hospitality Management. The setup held total cost constant and changed only the wording. One hotel read “$160 for a room and free breakfast included.” A competing hotel read “$140 for a room and $20 for breakfast.” Same total, and people still preferred the free-breakfast version. They chose the same way when the product became a car rental with insurance attached instead of a hotel with breakfast.

The result that matters arrived when the researchers swapped the wording. Changing “free” to “$0” shrank the preference, and dropping the word entirely so the breakfast was merely “included” erased it altogether. The advantage lived in the specific word, not in the fact that something cost nothing, and not in the saving the consumer was getting. A mediation analysis traced the route: the lift travelled through an emotional response to “free”, while measures of perceived room quality and budget allocation accounted for none of it. The feeling was carrying the choice, and the arithmetic was a passenger.

One boundary carries into everything below. The effect held reliably stronger when the free item sat on the lower-priced, lower-tier option, and it thinned out or vanished on premium options, where free framing can cheapen something meant to feel exclusive.

Where this shows up in your operation

The pricing page is the obvious place, though hardly the only one. This bias bites wherever you present a bundle: the membership page where joining perks sit, the trial offer with a complimentary session attached, the upgrade prompt in the app, the script your sales staff follow when they walk a prospect through what’s included, the renewal email listing what the member keeps.

In each of those, you’ve already made an unconscious choice between three framings. You name a thing as free, attach a dollar figure to it, or quote one combined number and let the extra dissolve into the total. Kim’s data says those three don’t behave the same way, even at an identical cost to the member, and most gyms default to the version that performs worst. The choice that feels cleanest on the page is the one leaving conversions on the table.

The reason the word works comes down to how people evaluate a price. Rather than reading a number and computing value, they weigh a deal against an internal sense of what the thing should cost, and “free” lands as a clean gain against that reference with nothing sitting on the other side. “$0” invites the same arithmetic but drains the feeling out, so the brain files it as a calculation instead of a win. Richard Thaler’s work on transaction utility named this gap decades ago: the perceived quality of a deal moves on its own track, separate from the amount actually paid.

The move, and how you’ll know it worked

Find every place you currently bundle something silently or price it at $0, and test naming it as free instead.

A membership page that says “Join for $89/month, includes your starter assessment” wastes the assessment entirely. Reframed as “$69/month membership plus a free starter assessment, normally $40”, the same total now carries a labelled gain the prospect can feel. Your charge hasn’t moved a cent, yet what they’re evaluating has.

One boundary keeps this honest: the free component has to be real and it has to be justified. “Free assessment” alone reads weaker than “free assessment, where we map your starting point and set your first eight weeks”, because the second tells the prospect what the free thing is. An unexplained freebie reads as filler, while a specified one reads as value you chose to give away.

You’ll see it working before the revenue does. Watch the questions prospects ask on the page or in the consult. When the framing lands, they start asking about the free component itself, wanting to know what’s in the assessment, rather than fixating on the monthly price. That shift in attention, from the cost to the included gain, is the mechanism doing its job, and conversion follows attention.

How Les Mills writes the same offer

Les Mills sells home-workout equipment bundles, and the way they write the offer shows the principle running in the open. Their barbell bundle carries a single bundle price, and beside the gear, every bundle line reads “INCLUDES 12-MONTH LM+ APP MEMBERSHIP” with the subscription described as a “FREE 12-month LES MILLS+ subscription, worth $118.”

Look at what they avoided. They didn’t roll the app into the equipment price and stay quiet about it, and they didn’t list it as a “$0 subscription” or a “$0 add-on.” They named it free, then anchored that free thing to a real standalone number, $118, which checks out against the app’s own retail price of around $14.99 a month. The buyer weighs the gear against what gear costs, then weighs a clearly labelled gain worth $118 sitting on top, and the second number does the emotional work a folded-in total never could.

That is the Kim finding executed on a live commerce page: a free label on the complementary component, justified with a real worth, attached to a bundle whose buyer is already price-sensitive.

Where this goes wrong

The fastest way to break this is to staple “free” to the wrong tier. Kim’s data showed the effect weakening on premium options, and a luxury hotel avoids advertising a free breakfast for the same reason. When your top membership tier sells on exclusivity and outcome, a “free” giveaway can cheapen the thing you spent effort positioning as worth paying for. Free belongs at the price-sensitive end of your range, not the prestige end.

The second failure is the freebie nobody believes. If the prospect knows the “free” component costs you nothing to hand out, or it’s vague enough to sound like padding, the label flips into a sales tactic rather than a gain. That “$118” in the Les Mills offer isn’t decoration; it’s what makes “free” mean anything. A free component with no credible worth behind it is just a word.

The third is overreach. This is a framing effect on a real bundle, not a rescue for an offer nobody wants. It moves preference between comparable options and won’t save a membership that’s overpriced or a service the prospect never wanted. Run it on offers that already make sense and it sharpens them; run it to paper over a weak offer and the prospect’s scrutiny climbs instead of dropping.

The question

Which of your bundled extras is disappearing into a single price right now, when it could be the word that closes the sale?

People Also Ask

What is the zero-price effect in gym pricing?

The zero-price effect is the tendency for people to respond to “free” far out of proportion to its actual cost saving. In gym pricing, a membership bundled with a “free” assessment or class can pull more preference than the same membership where that extra carries a $0 tag or folds silently into the monthly total. The driver is emotional rather than arithmetic: the word “free” holds a positive charge that an equivalent dollar-zero figure lacks, which is why the framing shifts choice even when the total cost stays identical.

How do I use “free” framing on my gym’s membership page without it looking cheap?

Attach the free component to your lower or mid-priced options rather than your premium tier, and always justify what the free thing is and what it’s worth. “Free starter assessment, normally $40, where we map your baseline and set your first block of training” works because it names a real gain with a credible value. A bare “free assessment” with no detail, or a freebie pinned to a prestige membership sold on exclusivity, tends to backfire and read as a discount tactic. The research found the effect concentrated on price-sensitive options, which is where most gym sign-ups actually happen.

Why does “free” outperform “$0” if they cost the same?

People don’t evaluate price as pure arithmetic. They judge a deal against an internal reference for what something should cost, and “free” registers as a clean gain with no downside to weigh, while “$0” invites the same calculation but strips the feeling out, so the brain treats it as a number rather than a win. Kim and colleagues’ 2026 experiments isolated this directly: swapping “free” for “$0” on an otherwise identical bundle shrank the preference, and dropping the word entirely removed the effect. The wording carried the lift, not the fact that something cost nothing.

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The cheapest change you can make to a bundle isn’t the price. It’s the one word you use to describe the part you were already giving away.

You’ve got the move for your pricing page. If you want the same behavioural-science read across your whole sales and onboarding flow, where this bias meets a dozen others, book a free 30-minute chat.

References: Kim, Lee, Min, Kim & Jhang 2026 (International Journal of Hospitality Management); Shampanier, Mazar & Ariely 2007 (Marketing Science); Thaler 1985 (Marketing Science). Anchor: Les Mills equipment bundles, verified June 2026.