Worked exampleExported from Calvance
3D Printing Material & Electricity
Use filament weight and print duration from your slicer to estimate material and electricity costs separately, then add the two expenses.
View template and methodPortrait Session & Extra Retouching
Calculate a portrait package total from selected photos, included retouching, extra-image prices and prorated overtime. Compare changes without charging twice.
Worked exampleExported from Calvance
Exported by the iOS App After importing, edit the numbers in Calvance.
When to use it
Use this after a client selects more retouched photos or a session lasts longer than the package allowance. The US example uses simulated USD prices: 18 selected photos versus 10 included, and 90 minutes versus 60 included. It does not estimate the photographer’s costs or profit.
Inputs
USD
| Inputs | Default |
|---|---|
| Selected photos | 18 |
| Included photos | 10 |
| Extra photo (USD) | 15 |
| Actual time (min) | 90 |
| Included time (min) | 60 |
| Extra time (USD/h) | 100 |
| Package fee (USD) | 200 |
Calculation method
Extra photos = the positive part of selected − included. The formula (x + abs(x)) ÷ 2 returns zero below the allowance. Multiply by the extra-photo price. Calculate excess time the same way and multiply real minutes by the hourly rate; Calvance converts minutes to hours. Total = package fee + photo extras + time extras.
(18 [Selected photos]-10 [Included photos] + abs(Selected photos-Included photos))/2 → Extra photos
Extra photos × 15 [Extra photo USD] → Photo extras USD
(90 [Actual time min]-60 [Included time min] + abs(Actual time min-Included time min))/2 → Overtime min
Overtime min × 100 [Extra time USD/h] → Time extras USD
200 [Package fee USD] + Photo extras USD + Time extras USD → Quote total USD
Change one input
Change selected photos from 18 to 24. The extra-photo count, photo fee and total update together. Actual time, included time and overtime fee remain unchanged.
| Result | Default | Changed |
|---|---|---|
| Extra photos | 8 | 14 |
| Photo extras (USD) | 120 | 210 |
| Overtime (min) | 30 | 30 |
| Time extras (USD) | 50 | 50 |
| Quote total (USD) | 370 | 460 |
Results are displayed to at most two decimal places; later formulas use unrounded values.
Scope and limits
- Simulated package; confirm included services and rates.
- Overtime is prorated, without billing-block rounding.
- Unused included photos or time do not reduce the package fee.
Photo counts must be nonnegative integers; actual time nonnegative, included time positive, and all prices nonnegative. All money uses one stated currency; no exchange rate is needed. Travel, studio hire, taxes, discounts, deposits, usage rights and exceptional retouching are excluded unless separately agreed in the package. This model does not implement minimum overtime blocks.
Download and import into Calvance to edit the numbers. The canvas does not reject every invalid input; check the stated ranges.
Common questions
Do fewer selected photos create a refund?
No. Extras stop at zero; the package fee stays unchanged. Refund terms require a separate agreement.
Does 10 minutes of overtime mean a full hour?
Not here: it costs one sixth of the hourly rate. If your contract bills started half-hours or hours, use that rule rather than this prorated model.
How to import your template
We recommend using the latest version of Calvance.
- Save the file. Choose Download template and save the .calvx file to Files on your iPhone or iPad. From a computer, you can send it to your device with AirDrop.
- Open Import. In All Canvases in Calvance, tap the add button to open the template screen, then choose Import.
- Choose the file. Select the saved .calvx file to create your own canvas. Importing uses one canvas from your allowance.
- Edit and check. Check the results against the worked example, then add your numbers. Duplicate the canvas to keep different versions.
More calculations to try
Worked exampleExported from Calvance
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View template and methodWorked exampleExported from Calvance
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One ingredient price, three bakes. Change the butter price to update batch and per-serving costs.
View template and methodDifferent tasks.
Separate canvases.
Choose a plan when you need more canvases, high-resolution image exports, or sync across devices.