CDN Cost Calculator
The formula
What the net cdn cost tells you
CDN delivery spend net of the origin-egress it replaces — the correct way to price caching, not on list per-GB alone.
Calculation: CDN = GB × regional rate; saved = origin egress × $0.09; net = CDN − saved + request fees. Enter your inputs and every substitution is shown below the result.
Reading the result
Static-heavy sites with a distant origin often see net CDN cost below zero; dynamic API passthrough rarely earns the hop.
Rules of thumb: A 25 TB video slice on US/EU blend: ~$2.1k delivery; on origin egress alone it would be $2.3k+.
Limitations and best practice
Cache-busting query strings and un-normalized cookies silently kill hit ratio; each miss bills origin fetch twice (origin egress + CDN pull).
This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Frequently asked questions
Does HTTP/3 change pricing?
Free tiers?
Source & methodology
CloudFront regional per-GB rates and AWS origin-egress $0.09/GB; request fees at $0.01 per 10k.
CDN Cost: what this tool answers
Budgets fail on the numbers nobody wrote down — this tool forces every one of them into the open. There are plenty of pages about CDN Cost; almost none of them show the working. This one does: the formula, every input, a fully computed example, and a sensitivity analysis calculated live from this engine’s own defaults.
Systems math in Technology & Computing has a peculiar property: it feels precise until an assumption breaks silently. CDN Cost is exact arithmetic over CDN = GB × regional rate; saved = origin egress × $0.09; net = CDN − saved + request fees — but only as truthful as the model. A wrong assumption about GB delivered per month will not throw an error; it will just quietly produce the wrong $484.06.
That makes documentation a feature. The steps block above exists so that the next engineer to read this page can verify not just the result but the reasoning — the difference between a number that gets acted on and one that gets argued with.
Every figure in the prose is generated by the engine rather than written beside it — the worked example resolves to net CDN monthly = $484.06 on the default inputs, and the sensitivity section ranks the inputs that move the result — GB delivered per month first, at ≈45.0 % of the headline for a ten-percent error either way in that input. Read the sections in order and you will be able to reproduce every figure by hand.
Inside the CDN Cost calculation: formula and every input
Here is the complete model this tool runs — CDN = GB × regional rate; saved = origin egress × $0.09; net = CDN − saved + request fees — with each input explained below. If a competitor’s page gives you a different answer from the same inputs, this is the text that settles which of you is right.
GB delivered per month (example value 25,325) is a measured number in the unit named by the label; the formula does not convert for you. If the period is partial, decide whether you mean elapsed or planned time and keep that meaning across every field.
Traffic mix (example value US/EU blended ($0.085)) is a branching choice rather than a figure you measure; the per-option effects are computed below. The example value is there to demonstrate the mechanics, not to describe your situation — overwrite it.
Origin egress avoided (GB) (example value 18,821) is a plain measured quantity — the unit shown in the label is the unit the formula expects. If you are unsure what belongs in this field, look at the printed steps: the substitution shows exactly how the engine uses it.
What each “Traffic mix” choice actually does: US/EU blended ($0.085) → $484.06 · Heavy LATAM/ME ($0.110) → $1,117.18 · APAC-heavy ($0.115) → $1,243.81 · Global premium ($0.130) → $1,623.68 — each value above is the model’s own output for that option, so the choice can be made on evidence rather than on what a category feels like it means.
A fully worked CDN Cost example
Rather than describe the calculation, here it is end to end — every substitution in order, starting from the inputs above. Starting figures: GB delivered per month, Traffic mix, Origin egress avoided (GB). The computed net CDN monthly comes out at $484.06, which the interpretation band labels “Negotiate committed-use rates now”.
- Delivery = 25,325 GB × $0.085 ≈ 2,177.95
- Requests ≈ 25.32 at 10k/GB
- Origin egress avoided = 18,821 × $0.09 = 1,693.89
- Net = 484.06/mo
CDN delivery — $2,177.95. This is the number experienced users quote when the headline alone would mislead.
Origin egress saved — $1,693.89. Compare it against the main result of $484.06 before drawing conclusions.
Effective $/GB net of savings — 0.019. If your inputs change, this is usually the first companion figure to move.
Origin hit ratio implied — 25.7%. If your inputs change, this is usually the first companion figure to move.
Keep this worked example open while you enter your own figures: matching the shape of the substitution is the fastest way to spot a unit or convention mistake.
How far CDN Cost can reasonably move
Read this table as the practical error bar on the headline figure. It answers the question people actually have after seeing a single number: how wrong could this be if the main input is off by ten or twenty percent?
| GB delivered per month setting | Net CDN monthly |
|---|---|
| 80 % of the example value | $48.47 |
| 90 % of the example value | $266.26 |
| example inputs | $484.06 |
| 110 % of the example value | $701.85 |
| 120 % of the example value | $919.65 |
The corridor runs from $48.47 to $919.65 across that band — which is the range worth planning inside rather than the single $484.06 point estimate. Reproduce it in the form above by editing GB delivered per month alone; the substitution steps will follow your figures exactly.
Where CDN Cost is fragile — and where it is not
This list was computed for this specific engine just now: each numeric input was nudged ±10 % while every other field held its example value, and the net CDN monthly was recalculated from scratch. Read it as a map of where CDN Cost is fragile — drawn for the example inputs, which is the map you want when deciding what to measure carefully.
- GB delivered per month +10 % → CDN Cost = $701.85 · −10 % → $266.26 (the net CDN monthly shifts ≈45.0 %)
- Origin egress avoided +10 % → CDN Cost = $314.67 · −10 % → $653.44 (the net CDN monthly shifts ≈35.0 %)
GB delivered per month is the dominant lever here: ten percent either way moves the result by about 45.0 %, from $266.26 to $701.85. Spend your verification effort there first, and treat Origin egress avoided as the second priority (≈35.0 % per ten percent). The remaining fields can sit at safe defaults without materially changing the answer — knowing which is which is what separates a careful calculation from an anxious one.
What a CDN Cost of $484.06 means in practice
A number on its own is trivia; a number against a range is intelligence. The default case lands in the “Negotiate committed-use rates now” band, and bands are deliberately wide because real situations overlap. Before treating the band as fact, note its width: ten percent either way on GB delivered per month already spans $266.26 to $701.85. The practical reading rules: read the band as a starting hypothesis, then test it: change the two dominant inputs by ten percent and see whether the verdict survives. Verdicts that survive stress are the ones worth acting on.
In Technology & Computing, CDN Cost is one instrument in an orchestra: on its own it is a number, next to CDN delivery and Origin egress saved it becomes a diagnosis. The tools linked above exist so the headline never has to carry that weight alone.
The errors that quietly break a CDN Cost figure
Cache-busting query strings and un-normalized cookies silently kill hit ratio; each miss bills origin fetch twice (origin egress + CDN pull). This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Reporting the headline and quietly discarding CDN delivery. The companions are where the shape of the trade-off survives the rounding.
This model has its own particular trap: GB delivered per month carries ≈45.0 % of the response per ten percent of error, so effort spent elsewhere is largely decorative.
A final trap is presentation: reporting CDN Cost to more decimal places than the inputs support. The tool prints what the arithmetic gives; you should quote only what your least precise field justifies.
Six things to confirm before acting on CDN Cost
- Compare the result with one independent method or published benchmark.
- Confirm the example values are plausible for your own situation before replacing them.
- Re-verify GB delivered per month against a source document — ten percent of error there moves the headline by ≈45.0 %.
- State, in one sentence, which convention each rate, unit or period in the form is using.
- Validate inputs against a live measurement, not datasheet peak figures.
- Repeat the ±10 % test on the inputs that matter and see whether the decision — not just the number — still holds.
Step by step: getting a trustworthy CDN Cost out of this tool
Using a calculator well sounds trivial, but the difference between a decision-grade figure and a throwaway one lives entirely in the routine. The routine for CDN Cost takes a minute to learn and applies to every input above.
Step 1 — collect, then type. Everything this tool asks for is listed above (gb delivered per month, traffic mix, origin egress avoided (gb)). Pull each figure from something you can point at — paperwork, a dashboard, a label — before touching a field. Guesswork at the input stage cannot be repaired at the interpretation stage. A result worth acting on survives having its two shakiest inputs halved.
Step 2 — enter the conservative case first. Resist the flattering scenario. Type the inputs you would defend in front of a sceptical reader, read the Net CDN monthly ($484.06 for the example values), and note the verdict band. When in doubt, prefer the boring input: the interesting one is usually the one you misread.
Step 3 — change one input at a time. Nudge a single field by ten percent, watch the headline and its companions move, then undo it. Two or three fields will dominate — the sensitivity table above already ranks them for this engine. A result worth acting on survives having its two shakiest inputs halved.
Step 4 — compute a corridor, not a point. Three runs — worst, likely, best — turn CDN Cost from a snapshot into a range. Plan against the pessimistic end and treat the optimistic end as the upside story. Precision is a promise you make about your data; make sure your inputs can keep it.
Step 5 — write the one-line memo. “Net CDN monthly = $484.06 on this date, from these inputs.” That line is the entire deliverable; everything else on this page is how you earned the right to write it. When two sources disagree, it is almost never the arithmetic that differs.
Where CDN Cost matters in practice
Numbers earn their keep in conversations, and CDN Cost is no exception. In Technology & Computing discussions around Cloud & Infrastructure, this figure decides whether an option stays on the table: it converts an opinionated debate into an arithmetic one, and arithmetic is the only referee both sides accept. The input you reach for first is usually the one you measured longest ago.
The companion outputs — CDN delivery and Origin egress saved — exist for the second stage of that screen: the headline sizes the prize, while the companions describe the trade-off you are accepting to get it. The point of transparency is that a reader can disagree with a specific line rather than with you.
Re-running this page costs nothing and catches the slow drifts that never announce themselves. In Technology & Computing the expensive mistakes are rarely sudden; they are small changes in GB delivered per month that nobody recalculated for a year. A figure with a date beside it becomes evidence; without one it stays an anecdote.
The questions that come up most about CDN Cost
What affects CDN Cost the most?
CDN Cost is driven above all by GB delivered per month. Perturbing only that field by ten percent either way produced $701.85 against the $484.06 baseline — a ≈45.0 % response, while Origin egress avoided manages ≈35.0 %.
Which matters more: origin egress avoided or gb delivered per month?
GB delivered per month, by a factor of about 1.3. Concretely: ten percent on GB delivered per month is worth ≈45.0 % of CDN Cost, the same nudge on Origin egress avoided only ≈35.0 %. That ranking is re-computed for each page from that page’s own defaults.
How much does the “Traffic mix” choice change the answer?
A great deal, on these inputs: CDN Cost comes out at $484.06 on the lowest option (“US/EU blended ($0.085)”) and $1,623.68 on the highest (“Global premium ($0.130)”). Each option is listed with its computed value so you can see what the choice is worth before you make it.
What is a typical CDN Cost?
With the example inputs on this page the result is $484.06, labelled “Negotiate committed-use rates now”. “Typical” varies with situation, which is why every result here ships with its verdict band and its sensitivity list: they turn one figure into a range you can locate yourself inside.
How do I calculate CDN Cost by hand?
CDN = GB × regional rate; saved = origin egress × $0.09; net = CDN − saved + request fees is the entire method. Work the inputs in that order — Delivery = 25,325 GB × $0.085 ≈ 2,177.95 — and you will reach $484.06 on the default figures, the same number this tool prints.
What happens to CDN Cost if gb delivered per month changes by 10 %?
The engine was re-run with that field moved by ten percent while everything else stayed fixed: the net CDN monthly goes across $266.26 to $701.85, a swing of roughly 45.0 % around the $484.06 baseline. That ratio is the practical definition of how much this input matters.
Is the CDN Cost result of $484.06 good or bad?
Neither, on its own — the label “Negotiate committed-use rates now” is the band this figure falls in for the example inputs, and your own inputs will place you elsewhere on the same ladder. Judge the number against your history and your alternatives, and remember that a ten-percent error in GB delivered per month alone moves it by ≈45.0 %.
Can CDN Cost be negative or empty?
Yes, and that is informative rather than broken: a negative CDN Cost usually means the inputs encode an outflow or a shortfall, and the verdict band above labels exactly that situation instead of hiding it.
Why is my measured value different from CDN Cost?
Real hardware and networks add contention, throttling, and overheads that first-principles CDN Cost assumes away. Expect the measured number to sit below $484.06; if it sits far below, that gap itself is the diagnostic.
Does HTTP/3 change pricing?
No per-GB change, but lower retransmit overhead cuts the requests and TLS-CPU add-on lines at the edge.
Free tiers?
Cloudflare flat-rate plans unbundle egress entirely — re-run this with $0.09 origin + flat plan fee to find the crossover.
Does this CDN Cost tool store my numbers?
No. The entire calculation runs in your browser session; nothing entered above is transmitted or saved, which is the correct behaviour for sensitive Technology & Computing figures and the reason you can re-run this page as often as you like.
Key terms on this page
- CDN delivery
- $2,177.95 in the default CDN Cost calculation — one of the secondary figures an experienced reader checks before trusting the primary number.
- Origin egress saved
- $1,693.89 on the example inputs — a companion figure printed beside the headline of CDN Cost so that no result is read in isolation.
- Effective $/GB net of savings
- 0.019 in the default CDN Cost calculation — one of the secondary figures an experienced reader checks before trusting the primary number.
- Net CDN monthly
- The primary output of this tool: $484.06 for the default inputs, computed exactly from CDN = GB × regional rate; saved = origin egress × $0.09; net = CDN − saved + request fees.
- Worked example
- The step-by-step substitution printed above, so the arithmetic can be re-derived by hand or in a spreadsheet.
- Verdict band
- A named zone on the range of plausible results; the example inputs land in “Negotiate committed-use rates now”, and your inputs may not.
- Sensitivity (±10 %)
- How far the CDN Cost moves when a single input is nudged ten percent either way; the ranked list on this page is computed live from this engine.
Method, sources and what this tool cannot tell you
Everything above runs on one stated formula, applied without hidden coefficients: CDN = GB × regional rate; saved = origin egress × $0.09; net = CDN − saved + request fees. Source of record: CloudFront regional per-GB rates and AWS origin-egress $0.09/GB; request fees at $0.01 per 10k. Any other implementation of this model should return the same figure for the same inputs. If one does not, the difference is in its assumptions — which this page prints and that one probably does not.
Treat the output as a precise answer to the question you typed: exact arithmetic, transparent formula, published source, no hidden rounding. The promise to the reader is narrow and testable: same inputs, same output, no silent rounding, and no figure presented without the formula that produced it.
What to do with your CDN Cost next
Add the costs the estimate omits first — fees, waste, contingency — then re-run before treating the figure as a budget line.
The audience here is planners sizing a spend before committing money. Everything you need to defend the result — formula, substitution, sensitivity, source — is printed above, so the only remaining variable is the honesty of your inputs.