| What it does | Free ecommerce calculators for profit margin, CAC, LTV, pricing, Shopify fees, and more
| Free size converter for clothing, shoes, rings, bras, accessories, sports gear, and bedding across US, UK, EU and international standards
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| Pricing model | Free
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| Key features | - Profit Margin Calculator to calculate profit after all costs and fees
- CAC Calculator to measure customer acquisition cost
- LTV Calculator to understand customer lifetime value and LTV:CAC ratio
- Pricing Calculator to work backwards from target margin to set price
- Shopify Fees Calculator showing exact fees across all plans and payment methods
- Refund Impact Calculator to quantify profit erosion from refunds
- Ad Metrics Calculator for ROAS, CPC, CTR, and cost per conversion
- Product Viability Calculator with YES/MAYBE/NO verdict
- Support for multiple currencies including USD, EUR, GBP, and CZK
| - Instant converters for 18 product categories
- Shoe size conversion between US, UK, EU, CM, and JP
- Ring size conversion between US, UK, EU, and mm
- Bra size conversion across US, UK, EU, FR/ES, and IT
- Kids clothing and shoe sizes by age, height, and weight
- Bike frame size finder from height
- Helmet size converter from head circumference
- Mattress and bed size comparison in inches and centimeters
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| What makes it different | - Completely free with no premium tiers, feature locks, or trial periods
- No account creation required, no data stored on servers
- Formulas follow standard ecommerce accounting with Shopify fees kept up to date
- Works for any ecommerce platform with manual fee fields for Amazon, Etsy, WooCommerce, TikTok Shop
- No signup requirement or data tracking beyond basic anonymous analytics
| - Charts built from standard international sizing references reviewed for consistency
- Covers 18 focused tools across fashion, accessories, sports gear and bedding
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 5 ● no change since last check | 17 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 3 | 0 |
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| Citation Flow (Majestic) | 15 | 19 |
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| Referring domains (Majestic) | 14 | 17 |
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EcomCalc