Web Calculators from Spreadsheets
Turn formulas into production APIs
Upload your pricing or financial model and get an API to power calculators on your site or app—no custom backend required.
How to Build a Spreadsheet-Powered Calculator
Launch a working calculator in three steps
01
Upload Logic
Put your pricing, scoring, or financial models into a spreadsheet.
pricing_model.xlsx
APR
Term (mo)
Amount
Payment
6.5%
36
$15,000
=PMT(A2,B2,C2)
5.9%
48
$22,000
=PMT(A3,B3,C3)
4.2%
60
$30,000
=PMT(A4,B4,C4)
Formulas live in your sheet — no backend porting.
02
Configure Inputs
Declare input fields, validation rules, and output mappings via API settings.
Input schema
apr
number 0–50%
validated
term_months
int 1–120
validated
amount
currency ≥ 0
validated
Strict validation + helpful errors for bad inputs.
03
Connect Front-End
Call the API from your website or app to render instant results.
Live result
POST /calculate
apr
5.9%
term_months
48
amount
$22,000
$514.33 / month
Render instantly on your site/app.
Business Outcomes You Can Measure
Faster builds, lower costs, and better conversions
90%
Development Speed
Turn complex spreadsheets into production calculators quickly.
60%
Cost Reduction
Cut backend boilerplate and maintenance with a managed API layer.
3x
Conversion Lift
Interactive tools drive engagement and higher qualified leads.
Industries Using Calculator APIs
From fintech to SaaS to retail
Frequently Asked Questions
Ready to Transform Your Workflow?
Get started today and see how this use case can revolutionize your business processes.