Check a user-entered baggage allowance against bag weight and dimensions, then estimate likely overweight, oversize.
Last updated
Baggage allowance and overweight fee estimate Enter the airline policy yourself, then check whether the bag is within the weight and
size limits, above the hard maximum, or likely to trigger overweight and oversize fees.
This page does not guess live carrier tables.
Quick baggage scenarios
Switch between a standard 23 kg checked-bag rule, a pounds-and-inches home scale check, or a cabin-bag policy without rebuilding the worksheet from scratch.
Measurement entry
Enter the baggage policy in the same units you are reading from the airline or from your home scale and tape measure.
How to use this page safely
Copy the allowance, hard maximum, and surcharge rule from the airline or travel brand
you actually booked. The point of this page is to do the arithmetic once you know the
policy, not to pretend one static fee table fits every carrier, fare, route, or date.
Estimated fee outcome
£65.00 estimated baggage charge
Checked bag. Outside the entered allowance and likely to trigger a fee. Flat overweight fee entered.
Overweight amount
3.4 kg
Linear size
143 cm
Oversize amount
0 cm
Status
Outside the entered allowance and likely to trigger a fee
What this estimate says now
Entered included weight limit: 23 kg.
Entered hard maximum: 32 kg.
Overweight charge estimate: £65.00.
Oversize charge estimate: £0.00.
Policy-copy note
Airlines often stack more than one baggage fee, and the same route can behave
differently depending on fare family, purchase timing, or whether the bag is cabin or
hold luggage. This page only estimates the rule set you entered.
Charge looks likely under the policy you entered This result is only as reliable as the allowance and surcharge fields copied in from the
airline policy. Recheck whether the carrier charges overweight and oversize fees
separately or bundles them.
An overweight baggage fee calculator should not pretend it already knows the live fee table for every airline. This page also explains the main assumptions behind the overweight baggage fee calculator result, highlights the supporting figures shown by the calculator, and helps the reader use the estimate without overstating what a quick online tool can prove.
Why this baggage fee page uses your airline policy as the input
A universal baggage-fee page becomes misleading as soon as it claims to know the live charges for every airline. The UK Civil Aviation Authority's published airline-charges tables make the problem obvious: baggage allowances and excess fees differ by airline, and more than one fee can apply to the same bag.
That is why this calculator does not ask you to select an airline and then guess the rest. Instead it asks for the specific weight limit, hard maximum, linear-size limit, and fee model shown in the policy for the bag you are travelling with. The page then does the arithmetic consistently and keeps the carrier-specific assumptions in your hands.
Allowance limit, hard maximum, and surcharge are three different questions
The first question is whether the bag sits inside the included allowance. The second is whether the bag goes above the carrier's hard maximum. Those are not the same thing. A bag can be above the free or included allowance yet still accepted with a fee. A bag above the hard maximum may no longer be treated as a normal surcharge case at all.
That is why the live tool keeps the included weight limit separate from the hard maximum weight. If the bag goes over the included limit but stays below the hard maximum, the page estimates the surcharge from the fee model you entered. If the bag goes over the hard maximum, the result flips into a refusal-risk warning instead of pretending another fee will solve the problem.
Linear size matters because oversize and overweight can stack
Baggage problems are not just about kilograms. Many airline policies also use a combined or linear-size measure, usually length plus width plus height, to decide whether a bag counts as oversize. That means a bag can trigger a weight fee, a size fee, or both at the same time.
The CAA airline-charges table explicitly notes that more than one fee may apply per bag. This page follows that principle. It calculates linear size, compares it with the maximum entered in the policy, and keeps the oversize charge separate from the overweight charge so the total stays transparent.
Linear size = length + width + height
Used to compare the bag with the policy's combined size limit.
Overweight amount = max(0, actual weight - included weight limit)
Shows how far the bag exceeds the entered allowance before any hard-maximum issue is checked.
Estimated total charge = overweight charge + oversize charge
Only used when the bag stays within the entered hard maximum.
How to copy the airline rule into the calculator properly
Start with the exact bag type in the booking: cabin, checked, or whichever label the airline uses. Then copy the included weight limit, the maximum combined dimensions, the hard maximum if the policy shows one, and the fee structure. Some airlines use one flat overweight fee. Others use a fee per kilogram or separate oversize surcharges.
The important habit is not to simplify too early. If the airline distinguishes between overweight and oversize charges, enter both. If the airline only publishes a flat fee for exceeding the limit, use the flat-fee model. The calculator is only trying to do the measurement and surcharge arithmetic once the real policy is already known.
A practical baggage allowance calculator should also let you work in the units you actually have in front of you. Many airline pages publish both 23 kg and 50 lb, or both 158 cm and 62 in. Many home luggage scales are pounds-first. That is why the calculator now supports kilograms and centimetres or pounds and inches directly instead of forcing you to convert everything manually before you start.
Worked examples: one overweight bag and one bag that should probably not travel
Suppose a checked bag has a 23 kg allowance, a 32 kg hard maximum, and a flat overweight fee of 65. If the bag weighs 26.4 kg and the linear size stays inside the limit, the page shows 3.4 kg overweight and an estimated 65 charge. That is a surcharge problem, not a refusal problem.
Now suppose the same airline policy applies but the bag weighs 33 kg. The page no longer behaves like a fee estimator because the bag is above the entered hard maximum. Instead it warns that the bag may be refused. That distinction matters because a passenger can waste time looking for the right excess-fee number when the real issue is that the bag no longer meets the policy at all.
What this calculator does not cover
This page does not know your airline's live table automatically, does not determine cabin-bag availability by fare family, and does not account for route-specific sports-equipment rules, infant allowances, loyalty entitlements, or airport-versus-online prepayment differences unless you manually reflect them in the fee fields.
Use it as a policy-check worksheet only. If the airline policy is unclear, the page cannot make it clearer by guessing. The safest workflow is to copy the real baggage rule first and then use the calculator to test the measurements and likely charge.
Frequently asked questions
Why does this page not just let me choose my airline?
Because baggage fees and allowances change too often and vary too much by fare, route, bag type, and purchase timing. This page is safer as a manual policy worksheet than as a stale carrier-fee lookup table.
Can overweight and oversize fees apply to the same bag?
Yes. The UK CAA airline-charges tables note that more than one fee may apply to a single bag. That is why this calculator keeps the overweight and oversize charge fields separate.
What is linear size in baggage rules?
It is the combined total of length, width, and height. Many airline baggage rules use that single total to decide whether a bag is oversize.
Why does the page stop estimating a charge when the bag is above the hard maximum?
Because many airlines stop treating the problem as a normal surcharge once the bag exceeds the hard maximum. At that point the more realistic question is whether the bag can travel at all.
Should I use kilograms even if my home scale shows pounds?
Not anymore. You can switch the calculator into pounds and inches, then enter the airline policy the same way your home scale and tape measure show it. That reduces the risk of a bad manual conversion before you even compare the bag with the allowance.
Does this estimate include airport-versus-online payment differences?
Only if you manually reflect that difference in the fee field you enter. The calculator does not infer whether the airline charges more at the airport or for late payment.
What if my airline bundles overweight and oversize into one fee?
Then enter the rule in the simplest way that matches the policy. For example, you may want to put the bundled amount into one fee field and leave the other at zero so the result still reflects the published total.
Can this page tell me whether a bag is allowed in the cabin?
Only to the extent that you enter the cabin-bag dimensions and weight limits correctly. Cabin eligibility still depends on the actual airline policy, boarding rules, and fare you booked.
Is excess baggage the same as overweight baggage?
Not always. Overweight baggage usually means a bag is heavier than the included limit, while excess baggage can also mean extra pieces, oversize bags, or other baggage-rule breaches that trigger separate fees. This page keeps those ideas separate so the estimate matches the airline policy more closely.
